Physiological Assessments of Sweet Sorghum Inoculated with Azospirillumbrasi...Agriculture Journal IJOEAR
Abstract—Some factors, such as yield increase and production cost reduction, must still be assessed as a way toimprove the sweet sorghum success prospects. The use of plant growth regulator mixtures has shown significant results in crop yield.Nitrogen assimilation stands out as one of the main limiting factors in plant production. Given the physiological effects of plant growth regulators and their mode of action in the photosynthetic metabolism, the aim of the current study is to assess the physiological responses of sweet sorghum plants inoculated with Azospirillum brasilenseto the use of nitrogen fertilization and plant growth regulators. The experiment comprised split plots, with four repetitions. The treatments comprised nitrogen (0, 40, 80, 120 and 160 kg ha-1) and biostimulant levels (0, 300, 400, 500 and 600 mL ha-1) in sweet sorghum culture inoculated with Azospirillum brasilense. Variables such as gas exchange and total recoverable sugars (TRS%) were assessed. The application of plant growth regulator at the dose 440.7 ml ha-1 showed the highest photosynthetic efficiency up to 46 DAE. According to the experimental conditions, the plant growth regulator treatment had no effect on the TRS %. It is concluded that the plant growth regulator did not affect the production of sugars by the plant.
Physiological Assessments of Sweet Sorghum Inoculated with Azospirillumbrasi...Agriculture Journal IJOEAR
Abstract—Some factors, such as yield increase and production cost reduction, must still be assessed as a way toimprove the sweet sorghum success prospects. The use of plant growth regulator mixtures has shown significant results in crop yield.Nitrogen assimilation stands out as one of the main limiting factors in plant production. Given the physiological effects of plant growth regulators and their mode of action in the photosynthetic metabolism, the aim of the current study is to assess the physiological responses of sweet sorghum plants inoculated with Azospirillum brasilenseto the use of nitrogen fertilization and plant growth regulators. The experiment comprised split plots, with four repetitions. The treatments comprised nitrogen (0, 40, 80, 120 and 160 kg ha-1) and biostimulant levels (0, 300, 400, 500 and 600 mL ha-1) in sweet sorghum culture inoculated with Azospirillum brasilense. Variables such as gas exchange and total recoverable sugars (TRS%) were assessed. The application of plant growth regulator at the dose 440.7 ml ha-1 showed the highest photosynthetic efficiency up to 46 DAE. According to the experimental conditions, the plant growth regulator treatment had no effect on the TRS %. It is concluded that the plant growth regulator did not affect the production of sugars by the plant.
Resistance to internal browning of pineapple fruits depends on several factors such as the cultural techniques through mineral fertilization. The objective of this work is to study the effects of the potassium fertilization for pineapple on internal browning of fruit in post-harvest conservation. The experiments have been carried out on the site of the University Nangui Abrogoua (Abidjan, Côte d’Ivoire) of July 2015 to the end of October 2016. Potassium has been applied according to four modalities of treatments (T0; T1; T2 and T3) made in 2nd, 4, 6 and 7th months (respectively) after plantation. The incidence of internal browning (IB), the phenolic content, sugars and ascorbic acid have been determined after post-harvest conservation of fruit. The activity of phenolic biosynthesis enzymes (PAL and TAL) and oxidation enzymes (PPO and POD) were evaluated. The results showed that BI intensity in pineapple fruit decreases with the potassium amount applied in field. This IB drop was correlated with the content of reducing sugars, total phenols, activity of PAL and the PPO. No symptom of IB was observed on pineapple fruits under treatment T2 (34 g of K2O/plant). Potassium has a depressive effect on phenolic biosynthesis. In effect, it inhibits the IB in the both varieties of pineapple studied that are Smooth Cayenne and MD2.
Improving Fruit Quality and Nutritional Value of Deglet Nour dates subjected ...Agriculture Journal IJOEAR
A field study was carried out during the two consecutive years (2015-2016) in the region of Biskra, southern east of Algeria on date palms of Deglet-Nour variety, grown in a salty environment. To study the combined effect of salinity and phospho-potassium fertilization on the quality and nutritional value of dates, two sites of different salinity, occupied by 54 date palms variety Deglet-Nour has been selected. The palms were fertilized by receiving three doses of potassium (0, 2 and 3 kg / palm) as potassium sulphate K 2 SO 4 (50%) combined with three levels of phosphorus (0, 1 and 2 kg / palm) as superphosphate (TSP 46%). The results revealed that applying 2 kg of potassium/palm in an excessively salty environment and 3 kg/palm in a low or unsalted environment associated to 1 kg of phosphorus in the two different cases of salinity of the two sites S1 and S2 improving the fruit traits.
An efficient incentive of Nitrate and Fluoride on Organic highland cropping s...IOSR Journals
Abstract: Exerting necessitated concentrations of Nitrate and fluoride to the organic highland cropping
systems is a vital management technique. All the chemical elements of the earth’s crust occur in widely differing
omnipresent concentrations, due to their different nuclear chemical formation and geochemical history. The use
of biological nitrogen and fluoride inputs complicates its balancing act due to dandier uncertainty in inorganic
Nitrogen and Fluoride availability. The growers to strike maintain Nitrogen provisioning to support crop
growth and retention of limit pollution followed by fluoride associated soils. Due to various activities of the man
in domestic field, agriculture area and industrial establishment the environment around us consisting soil, water
and air gets polluted. Fluoride inexhaustible concentrations forbid the growth of crop even though nitrates
reposit in the cultivated soils. The purpose of this project was to establish kinetics when nitro fluorides
associated in the highland soils to different crop systems towards environmental pollutions. Cordia Africana
and alfalfa are the plants which make soil to get enrichment of Nitrates and deescalate of concentrations of
fluorides from cultivated soils through its decomposition. This entire study went on its conventionally tilled
crops followed by Cordia Africana and alfalfa stems and leaf particles. Surface soil nitrate concentrations were
measured weekly, biweekly by volumetric analysis and nitrate leaching was estimated from tension Lysimeters
which were buried at the soil bedrock interface. Subsequently by using Orion 720A fluoride ion meter, deescalated
concentrations of fluorides have been measured. The demonstrated concentrations of Soil in NO3
variables, coefficients of variations from the mean concentrations across all samplings have been recorded
sporadically. The total area of the soil bed was maintained the same PH values until project was completed by
weigh Lysimeters. The timing of elevated Nitrate concentrations (10-15PPM) and the concentrations of fluoride
in deeper soil water corresponds with fallow periods. These dynamics will assist growers in adapting the timing
management operations and reduces nitrate departures.
Effect of Lime and Phosphorus Fertilizer on Acid Soil Properties and Sorghum ...Premier Publishers
Acidic soils limit the production potential of sorghum crop because of low availability of basic cations and excess of hydrogen (H+) and aluminium (Al3+) in exchangeable forms at Assosa. Experiments were conducted to evaluate the response of acid soil properties and sorghum to lime and Phosphorus fertilizer around Assosa area during 2012-2015 cropping seasons. Five levels of lime (0, 1.88, 3.76, 5.64 and 7.52 t ha-1) and four levels of P (0, 23, 46 and 69 kg ha-1) laid out in randomised complete block design with three replications.Analysis of variance revealed that the interaction effect of lime and phosphorus fertilizer significantly (P≤0.05) affected head weight, straw and grain yield of sorghum. The highest grain yield of sorghum was obtained from 5.65 t lime ha-1with application of 23, 46 and 69 kg P2O5 ha-1 and 7.54 t lime ha-1with application of 0, 23 and 46 kg P2O5 ha-1 treatments. The partial budget analysis also indicted that 1.88 t lime ha-1 along with 23 kg P2O5 ha-1 gives higher net benefits. Therefore, the management of P- deficient acid soils of Assosa area requires combined applications 1.88 t lime ha-1with application of 23 kg P2O5 ha-1.
Micronutrients: role and management in fruit crops (2nd doctoral seminar:Panc...Panchaal Bhattacharjee
Micronutrient deficiency is a key isssue to be addressed for sustainable fruit crop production. Here individual micronutrients are discussed in details regarding their role and mangement in fruit crops.
Determination of the optimal level of the fertilizing elements N, P, K on the...Innspub Net
The objective of the test is to determine the best formula of the NPK elements for two local varieties improved of corn. The studied plant material is composed of local populations improved P1, P2. The factorial test is driven with two P1 varieties, P2 and four doses of NPK according to an experimental device in blocks of Fischer to four blocks. The doses of 20 – 10 – 10, 30 – 15 – 15, 10 – 5 – 5 and 40 – 20 – 20 correspond respectively to the T1 treatments, T2, T3 and T4. On the T2 (2,073 m ± 0,009) P1 is observed of the heights raised of stem. The T4 (1, 85 m ± 0,173) recorded a stem raise of P2. The T2 (30, 75 ± 1,500) P1 reached the highest number of grains in a row. The T1 (30, 75 ± 1,258) P2 got high number of grains in a row. Greater number of grains in an ear is observed on T3 (520 ± 15,491) of P1. The greatest number of grains per ear is noted on the T2 (510,5 ± 10,630) of P2. The T2 (4, 20 t ha-1 ± 0,12) P1 recorded better outputs in grains. The T1 (4,035 t ha-1 ± 1,831) P2 got the best output in grains. The corresponding T2 to the dose (30 – 15 – 15) could be kept for the P1. The corresponding T1 to the dose (20 – 10 – 10) could be recommended for the P2 to increase the productivity of corn in the zone of survey.
Urea-supergranules and phosphorus application increases irrigated rice yields...INNS PUBNET
Nitrogen and phosphorus deficiencies are some of the main factors restricting irrigated rice (Oryza sativa L.) productivity in Burkina Faso. Urea supergranules (USG) have been proven to increase rice yield but this increased productivity is likely to be constrained because P is becoming limiting in irrigated rice systems. Field experiments were carried out with rice variety Nerica 62N in Sourou valley in the wet season of 2012 and in the dry season of 2013. The effect of two sizes (1.8 and 2.7 g) of USG and five levels of phosphorus (0, 20, 30, 40 and 50 kg P ha-1) were studied in a split plot design on rice yields. The use of USG 2.7 g did not significantly increase rice yields compare with USG 1.8 g in both seasons. P application significantly increased rice yields. The 1.8 g USG significantly increased the agronomic efficiency (AE) by 48.9% over the USG 2.7 g in the 2012 wet season while the increase in AE was 24.4% in the 2013 dry season. The best AE 42 kg kg-1 in 2012 and 25 kg kg-1 in 2013 were obtained with 50P and 30P. This study suggests that USG can be used by farmers in small rate (USG 1.8 g) to improve nitrogen use efficiency and the application of 30 kg P kg-1 seems to be adequate to increase yield in irrigated rice cropping system.
Resistance to internal browning of pineapple fruits depends on several factors such as the cultural techniques through mineral fertilization. The objective of this work is to study the effects of the potassium fertilization for pineapple on internal browning of fruit in post-harvest conservation. The experiments have been carried out on the site of the University Nangui Abrogoua (Abidjan, Côte d’Ivoire) of July 2015 to the end of October 2016. Potassium has been applied according to four modalities of treatments (T0; T1; T2 and T3) made in 2nd, 4, 6 and 7th months (respectively) after plantation. The incidence of internal browning (IB), the phenolic content, sugars and ascorbic acid have been determined after post-harvest conservation of fruit. The activity of phenolic biosynthesis enzymes (PAL and TAL) and oxidation enzymes (PPO and POD) were evaluated. The results showed that BI intensity in pineapple fruit decreases with the potassium amount applied in field. This IB drop was correlated with the content of reducing sugars, total phenols, activity of PAL and the PPO. No symptom of IB was observed on pineapple fruits under treatment T2 (34 g of K2O/plant). Potassium has a depressive effect on phenolic biosynthesis. In effect, it inhibits the IB in the both varieties of pineapple studied that are Smooth Cayenne and MD2.
Improving Fruit Quality and Nutritional Value of Deglet Nour dates subjected ...Agriculture Journal IJOEAR
A field study was carried out during the two consecutive years (2015-2016) in the region of Biskra, southern east of Algeria on date palms of Deglet-Nour variety, grown in a salty environment. To study the combined effect of salinity and phospho-potassium fertilization on the quality and nutritional value of dates, two sites of different salinity, occupied by 54 date palms variety Deglet-Nour has been selected. The palms were fertilized by receiving three doses of potassium (0, 2 and 3 kg / palm) as potassium sulphate K 2 SO 4 (50%) combined with three levels of phosphorus (0, 1 and 2 kg / palm) as superphosphate (TSP 46%). The results revealed that applying 2 kg of potassium/palm in an excessively salty environment and 3 kg/palm in a low or unsalted environment associated to 1 kg of phosphorus in the two different cases of salinity of the two sites S1 and S2 improving the fruit traits.
An efficient incentive of Nitrate and Fluoride on Organic highland cropping s...IOSR Journals
Abstract: Exerting necessitated concentrations of Nitrate and fluoride to the organic highland cropping
systems is a vital management technique. All the chemical elements of the earth’s crust occur in widely differing
omnipresent concentrations, due to their different nuclear chemical formation and geochemical history. The use
of biological nitrogen and fluoride inputs complicates its balancing act due to dandier uncertainty in inorganic
Nitrogen and Fluoride availability. The growers to strike maintain Nitrogen provisioning to support crop
growth and retention of limit pollution followed by fluoride associated soils. Due to various activities of the man
in domestic field, agriculture area and industrial establishment the environment around us consisting soil, water
and air gets polluted. Fluoride inexhaustible concentrations forbid the growth of crop even though nitrates
reposit in the cultivated soils. The purpose of this project was to establish kinetics when nitro fluorides
associated in the highland soils to different crop systems towards environmental pollutions. Cordia Africana
and alfalfa are the plants which make soil to get enrichment of Nitrates and deescalate of concentrations of
fluorides from cultivated soils through its decomposition. This entire study went on its conventionally tilled
crops followed by Cordia Africana and alfalfa stems and leaf particles. Surface soil nitrate concentrations were
measured weekly, biweekly by volumetric analysis and nitrate leaching was estimated from tension Lysimeters
which were buried at the soil bedrock interface. Subsequently by using Orion 720A fluoride ion meter, deescalated
concentrations of fluorides have been measured. The demonstrated concentrations of Soil in NO3
variables, coefficients of variations from the mean concentrations across all samplings have been recorded
sporadically. The total area of the soil bed was maintained the same PH values until project was completed by
weigh Lysimeters. The timing of elevated Nitrate concentrations (10-15PPM) and the concentrations of fluoride
in deeper soil water corresponds with fallow periods. These dynamics will assist growers in adapting the timing
management operations and reduces nitrate departures.
Effect of Lime and Phosphorus Fertilizer on Acid Soil Properties and Sorghum ...Premier Publishers
Acidic soils limit the production potential of sorghum crop because of low availability of basic cations and excess of hydrogen (H+) and aluminium (Al3+) in exchangeable forms at Assosa. Experiments were conducted to evaluate the response of acid soil properties and sorghum to lime and Phosphorus fertilizer around Assosa area during 2012-2015 cropping seasons. Five levels of lime (0, 1.88, 3.76, 5.64 and 7.52 t ha-1) and four levels of P (0, 23, 46 and 69 kg ha-1) laid out in randomised complete block design with three replications.Analysis of variance revealed that the interaction effect of lime and phosphorus fertilizer significantly (P≤0.05) affected head weight, straw and grain yield of sorghum. The highest grain yield of sorghum was obtained from 5.65 t lime ha-1with application of 23, 46 and 69 kg P2O5 ha-1 and 7.54 t lime ha-1with application of 0, 23 and 46 kg P2O5 ha-1 treatments. The partial budget analysis also indicted that 1.88 t lime ha-1 along with 23 kg P2O5 ha-1 gives higher net benefits. Therefore, the management of P- deficient acid soils of Assosa area requires combined applications 1.88 t lime ha-1with application of 23 kg P2O5 ha-1.
Micronutrients: role and management in fruit crops (2nd doctoral seminar:Panc...Panchaal Bhattacharjee
Micronutrient deficiency is a key isssue to be addressed for sustainable fruit crop production. Here individual micronutrients are discussed in details regarding their role and mangement in fruit crops.
Determination of the optimal level of the fertilizing elements N, P, K on the...Innspub Net
The objective of the test is to determine the best formula of the NPK elements for two local varieties improved of corn. The studied plant material is composed of local populations improved P1, P2. The factorial test is driven with two P1 varieties, P2 and four doses of NPK according to an experimental device in blocks of Fischer to four blocks. The doses of 20 – 10 – 10, 30 – 15 – 15, 10 – 5 – 5 and 40 – 20 – 20 correspond respectively to the T1 treatments, T2, T3 and T4. On the T2 (2,073 m ± 0,009) P1 is observed of the heights raised of stem. The T4 (1, 85 m ± 0,173) recorded a stem raise of P2. The T2 (30, 75 ± 1,500) P1 reached the highest number of grains in a row. The T1 (30, 75 ± 1,258) P2 got high number of grains in a row. Greater number of grains in an ear is observed on T3 (520 ± 15,491) of P1. The greatest number of grains per ear is noted on the T2 (510,5 ± 10,630) of P2. The T2 (4, 20 t ha-1 ± 0,12) P1 recorded better outputs in grains. The T1 (4,035 t ha-1 ± 1,831) P2 got the best output in grains. The corresponding T2 to the dose (30 – 15 – 15) could be kept for the P1. The corresponding T1 to the dose (20 – 10 – 10) could be recommended for the P2 to increase the productivity of corn in the zone of survey.
Urea-supergranules and phosphorus application increases irrigated rice yields...INNS PUBNET
Nitrogen and phosphorus deficiencies are some of the main factors restricting irrigated rice (Oryza sativa L.) productivity in Burkina Faso. Urea supergranules (USG) have been proven to increase rice yield but this increased productivity is likely to be constrained because P is becoming limiting in irrigated rice systems. Field experiments were carried out with rice variety Nerica 62N in Sourou valley in the wet season of 2012 and in the dry season of 2013. The effect of two sizes (1.8 and 2.7 g) of USG and five levels of phosphorus (0, 20, 30, 40 and 50 kg P ha-1) were studied in a split plot design on rice yields. The use of USG 2.7 g did not significantly increase rice yields compare with USG 1.8 g in both seasons. P application significantly increased rice yields. The 1.8 g USG significantly increased the agronomic efficiency (AE) by 48.9% over the USG 2.7 g in the 2012 wet season while the increase in AE was 24.4% in the 2013 dry season. The best AE 42 kg kg-1 in 2012 and 25 kg kg-1 in 2013 were obtained with 50P and 30P. This study suggests that USG can be used by farmers in small rate (USG 1.8 g) to improve nitrogen use efficiency and the application of 30 kg P kg-1 seems to be adequate to increase yield in irrigated rice cropping system.
Optimal Salinity, Nitrate and Phosphate Concentrations on Germination and Gro...iosrjce
The effects of salinity, nitrate (N) and phosphate (P) concentrations on the germination of Enhalus
acoroides seeds and growth were studied under laboratory condition. The highest percentage of seed
germination was at 20 ppt salinity for all concentrations of Nand P. However, there was not different (P >0.05) in
the percentage of germinated seed compared with other salinity levels of 25 and 30 ppt at all N and P concentrations. In
regard to the growth rate of seedling was found to be effective to the extension of root and lengths. In present
study, root and leaf lengths of E. acoroides seedling were observed to be significantly declined when the level of
salinity and N and P concentrations increased. Hence, alteration in the major nutrient concentration indicates
the vulnerability of E. acoroides seagrass under culturing laboratory condition, which must be avoidably
approached prior to transplantation into the meadow area for conservative management of seagrass resource.
2 ijhaf dec-2017-3-effect of biochar issued fromAI Publications
Cassava is an important food crop cultivated (75%) by smallholder farmers. However, yields are very low and rarely exceed 17tons/ha-1. A study was carried out at Nkolbisson in the humid forest zone (HFZ) of Cameroon to assess the effect of three types of biochar issued from Cassava (CSb), Ricehusk (RHb), and Corncob (CCb) on the root yield of variety 8034 cassava cultivated along a soil fertility gradient. The biochars were produced using an Elsa pyrolysis technology with carbonisation time of 50-58mins and temperature ranging from 400-6500C. Twelve 8m2 plots were constructed in three sites from the higher elevated, moderately elevated and flat fields.The biochars were applied at 20t.ha-1in three replicationsin a completely randomized design.Results showed that the biochars were high in nutrients containing 4.17-18.15g.kg-1 N, 22.26-42.51 mg.kg-1 P, 2.48-4.18 cmol.kg-1 K and pH (H2O: 7.78-10.81) and were significantly higher than the no-input soil containing 0.79g.kg-1 N, 7.41mg.kg-1 P, 1.42 cmol.kg-1 K and pH (5.68). Cassava root yield was significantly higher (P < 0.05) in RHb plots (23.22 t.ha-1) than CCb (20.53 t.ha-1), CSb (18.67 t.ha-1) and the no-input soil (16.13 t.ha-1). The addition of biochar particularly RHb, increasednutrient uptake in cassava leaves and roots compared with theno-input soil. The study concludes that biochars with higher N, Pand K content tend to increase cassava root yield and suggestsincreasing the quantity of biochar to 40t/ha-1or continuous application in combination with other farming options such as poultry manure, compost or mineral fertilizer tomaximize cassava productivity given the benefits of biochar.
Nitrogen and Phosphorus Use EfficiencyinImproved Potato_Hailu Gebru 2017.pdfAbebeChindi1
Abstract Use of nutrient efficient crop species or cultivars
within species in combination with improved crop production
practices offer the best option for meeting the future food
requirements of growing world populations. Efficiency improvement has a key role for nutrient use and it improves both
productivity of yield and minimizes risks of losses that potentially harm the environment. To improve nutrient use efficiency (NUE), one strategy is to select cultivars of crops with high
NUE. Both nitrogen (N) and phosphorus (P) are among essential macronutrients commonly applied to agricultural crops
to optimize yields. Evaluation of potato cultivars with high N
and P efficiency is essential for sustainable production of the
crop. In Ethiopia, however, little research has been done to
elucidate better NUE of potato crop until recently. This study
was, thus, designed to evaluate selected potato cultivars
(Belete, Gudene, Jalene, Marachere and one local check) for
NP use efficiency under low levels of the nutrients in Wolaita
Sodo University, Ethiopia during 2014 and 2015. Factorial
combination of 3 levels of each N (0, 55.5 and 111 kg N
ha−1 ) and P (0, 19.5 and 39 kg P ha−1 ) were assigned to the
main plots and the 5 cultivars to subplots of split-plot design in
three replications. Efficiency indices such as agronomic efficiency, physiological efficiency and recovery efficiency were
computed for combined NP nutrients. Results showed that
agronomic nitrogen use efficiency, apparent phosphorus use
efficiency and phosphorus use efficiencies were significantly
influenced by the interaction effect of rates of NP nutrition and
variety. Application of NP more than 55.5:19.5 kg ha−1 will
not beneficial due to their less or equal use and recovery efficiencies to 55.5:19.5 kg NP ha−1
. Belete was the most NP
efficient variety followed by Jalene and Gudene in all efficiency indices. Therefore, Belete, Jalene and Gudene return better
for NP at 55.5:19.5 kg ha−1 for economical use of fertilizes
while obtaining satisfactory yield. It can be concluded that
yield response variation of the varieties was related to their
differences in NP uptake and use efficiencies; and the improved potato varieties were superior to local check in using
NP nutrients efficiently
This is a seminar paper about nano-fertilizer for agricultural application prepared by Md. Parvez Kabir, an MS Student under the department of Soil Science of Bangabandhu Sheikh Mujibur Rahman Agricultural University. This paper helps to know how it increases the nutrient use efficiency, yield and decreases the toxicity effect and cost of crop cultivation.
An Agronomic field study was conducted at University of Limpopo Experimental farm, Syferkuil, over two summer growing seasons to determine the optimum phosphorus (P) rate and also assess the productivity of pigeonpea under intercrop with maize. Five P rates (0, 15, 30, 45, and 60 kg P ha-1) were evaluated under sole and intercropped pigeonpea. Treatments were laid out in a randomized complete block design with four replicates. Results revealed that variable P fertilizer rates exerted significant effect on pigeonpea grain yield in both seasons. Highest grain yields of 922 and 1141.7 kg ha-1 under sole and intercrop plots, respectively, were achieved at 45 kg P ha-1 during first and second seasons, respectively. However, the predicted optimum grain yield of 734 and 1034 kg ha-1 based on the response model was achieved at 52.67 kg P ha-1 and 42.84 kg P ha-1, in the respective seasons. Intercropping achieved a significantly higher pigeonpea grain yield (+37%) during second year than sole cropping following P addition; with over 21% mean grain yield advantage across the two planting seasons. Hence, depending on the inherent soil-P level, application of 42-53 kg P ha-1 under pigeonpea/maize intercrop represents the range at which P is optimum for maximum pigeonpea grain yield and better returns for farmers.
Organic and inorganic nutrient sources influeced growth, flowering, fruition,...Innspub Net
Fruit relative water content, carotenoid total chlorophyll content, flowering, fruition, growth and yield parameters of pepper (Capsicum annuum L.) cultivars: ‘Granada’, ‘Goliath’ and ‘Nobili’ were evaluated under two level of irrigation water: tap water (control) and tap water + 50mm NaCl, organic and inorganic fertilization in order to determine the field performance, for the improvement of smallholder agriculture in Cameroon. Four fertilizer application rates (0, 3, 6 and 12 t.ha-1) of Water Lettuce (WL) and Poultry Manure (PM) and 100kg/ha of NPK were used in a randomized complete block design experiment with four replications. The results overall indicated that the raising of fertilizer application rate of PM an WL increased significatively (p<0.05) carotenoid content, fruit water content, growth and agronomical parameters and decreased the date of flowering and fruition for all varieties studied compared to the control and NPK fertilizer, and what it regardless of the level of salinity. Application of WL or PM at 12 t ha-1 and NPK significantly increased fruit water content, growth and yield parameters in Granada compared to other cultivars. Irrigation of saline water decreased significantly (p<0.05) growth and yield parameters of all varieties. Significant (p<0.05) increased in growth parameters was observed in all cultivars at NPK fertilization. ‘Granada’ showed better growth and yield than ‘Nobili’ and ‘Goliath’ revealing a greater response of this cultivar to fertilization. This study is important contribution to identify tolerant cultivars for salt stress and permit to restore soil fertility and increase yield in coastal areas in Cameroun througth culture of Granada tolerant’s cultivar for salt stress.
8 ijhaf oct-2017-10-influence of nitrogen fixingAI Publications
A field experiment was conducted for two successive seasons 2012/2013 and 2013/2014 with four replicates at the experimental farm, Faculty of Agriculture, Omdurman Islamic University to determine the effect of inoculation and co-inoculation of symbiotic nitrogen fixing and phosphate solubilizing bacteria on fenugreek (Trigonella foenum-graecum L.) growth and yield. Fenugreek plant variety Kodab was used. Two bacterial strains Sinorhizobium meliloti strain TAL380 and Bacillus megatherium var. phosphaticum strain (BMP), each alone or in combination. Control plants were kept for comparison. The following measurements were taken per plant: number of nodules, dry weight of nodules, shoots and roots, plant height, pod length, number of pods/plant, number of seeds/pod, 1000 seed weight and yield. Results showed that inoculation with TAL380 and BMP each alone significantly increased nodulation and nodule dry weight compared to the control. Inoculation with BMP significantly increased root dry weight, when inoculation with TAL380 significantly increased shoot dry weight and plant height, co-inoculation significantly increased root and shoot dry weight compared to the control. The two bacterial inoculations each alone or in combination significantly increased number of pods and insignificantly increased number of seeds per pod and 1000 seed weight at both seasons. There was no effect of inoculation with bacteria on pod length. Co-inoculation significantly increased fenugreek seed yield at both seasons compared to the control.
Utilization of Marginal Soils with Application of Phosphorus and Ethephon for...Agriculture Journal IJOEAR
— Abundance of marginal soils is among the major constraint to achieve high yield for crop production due to unsuitable physical and chemical properties of the soils. Commonly, farmers would manage the marginal soil by adding soil amendment, compost and fertilizer which increase the cost of production. Alternatively, application of fertilizer together with plant growth regulator (PGR) during crop management can be practiced to utilize the marginal soil effectively. The aim of this experiment was to determine effects of phosphorus (P) fertilizer and PGR namely ethephon on growth performance of sweet corn grown in three marginal soils namely Rasau, Kuah and Dampar. The treatments were arranged as factorial randomized complete block design with four rates of P fertilizer and standard rate of ethephon replicated four times. The results indicated that the physical properties of the marginal soils vary which Rasau dan Kuah series have low content of silt (10.30% and 36.10%), respectively and clay (9.40% and 11.86%) while Dampar series has low sand content (21%). Consequently, Dampar series depicted highest soil moisture content (18.80%) compared to Rasau and Kuah with high content of silt and clay at 42.43% and 36.43%, respectively. At tasseling stage, where application of P fertilizer with combination of ethephon at 0 and 15 kg P 2 O 5 ha-1 there were significant difference between soil series on root length, total biomass wet and dry weight but exception for total biomass dry weight at 0 kg P 2 O 5 ha-1. Moreover, at 45 kg P 2 O 5 ha-1 there were significant difference among soil series on leaf number and total biomass dry weight whereas at highest P rate of 60 kg P 2 O 5 ha-1 only root length and root volume were affected. Most of the results were observed highest on Rasau soil series which contain highest sand particle instead of silt and clay compared to Kuah and Dampar series. However, the addition of ethephon and several P rates did not affect plant height among soil series. The results suggest that, the marginal soil can be utilized for sweet corn production by addition of combined P fertilizer at low rate and PGR.
Growth and yield of 12 accessions of Pawpaw (Carica papaya L.) as influenced ...Innspub Net
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Effect of nitrogen and phosphorus fertilization sources on the potato crop yield (Solanum tuberosum L.)
1. http://www.revistas.unal.edu.co/index.php/refameResearch article
Effect of nitrogen and phosphorus fertilization
sources on the potato crop yield (Solanum
tuberosum L.)
Efecto de fuentes de fertilización nitrogenada y fosforada en
el rendimiento del cultivo de papa (Solanum tuberosum L.)
ABSTRACT
doi: 10.15446/rfnam.v73n3.82624
Keywords:
Alkaline soils
Essential plant nutrient
Fertilizers
Potato yield
Solanum tuberosum
RESUMEN
Palabras clave:
Suelos alcalinos
Nutrientes vegetales
esenciales
Fertilizantes
Rendimiento de papa
Solanum tuberosum
1
Departamento de Fitotecnia. Facultad de Agronomía. Universidad Nacional Agraria La Molina. Av. La Molina. AP 12-056, Lima, Perú.
2
Drokasa Perú S.A. Av. Calca 142, Cercado de Lima. CP 15012, Lima, Perú.
3
Departamento de Biología. Facultad de Ciencias. Universidad Nacional Agraria La Molina. Avenida La Molina. AP 12-056, Lima, Perú.
* Corresponding author: <rpinedo@lamolina.edu.pe>
Received: February 4, 2020; Accepted: May 7, 2020
Rev. Fac. Nac. Agron. Medellín 73(3): 9255-9261. 2020 ISSN 0304-2847 / e-ISSN 2248-7026
Rember Pinedo-Taco1
*, Tulio Olivas-Alvarado2
, Gilberto Rodríguez-Soto1
and Viviana Castro-Cepero3
Potato (Solanum tuberosum L.) is a demanding crop regarding fertilization practices, and its productivity
also depends on the variety used, environmental conditions, soil fertility, and crop management. The
aim of this study was to investigate the effect of the interaction of nitrogen and phosphorus fertilization
sources on potato crop yield. A randomized block design with a 3×3 factorial arrangement, nine
treatments, and four repetitions was established. INIA-303 Canchan was the variety evaluated using
three nitrogen fertilization sources: ammonium nitrate (AN), ammonium sulfate (AS), and urea. Also,
three phosphorus sources were used: monoammonium phosphate (MAP), diammonium phosphate
(DAP), and triple superphosphate (TSP). Total yield, commercial yield, tuber number per plant, and
tuber weight per plant were studied. INIA-303 Canchan variety showed positive responses to the
combinations of nitrogen and phosphorus fertilization according to the soil and climate conditions where
the research was carried out. AN+DAP was the combination with the highest total yield, commercial
yield, number, and weight of tubers per plant (P<0.01).The fertilization mixtures of AN+DAP, AS+MAP,
and AN+MAP, applied on the INIA-303 Canchan potato variety, can be recommended to achieve
yields between 32.45 t ha-1
and 33.98 t ha-1
.
La papa (Solanum tuberosum L.) es un cultivo exigente con respecto a las prácticas de fertilización, y
su productividad también depende de la variedad utilizada, las condiciones ambientales, la fertilidad
del suelo y el manejo del cultivo. El objetivo de este estudio fue investigar el efecto de interacción
de las fuentes de fertilización nitrogenadas y fosforadas en el rendimiento del cultivo de papa. Se
estableció un diseño factorial 3×3 de bloques al azar con, nueve tratamientos y cuatro repeticiones.
La variedad evaluada fue INIA-303 Canchan con tres fuentes de fertilización nitrogenada: nitrato de
amonio (NA), sulfato de amonio (SA) y urea, y tres fuentes de fósforo: fosfato monoamónico (FMA),
fosfato diamónico (FDM) y superfosfato triple (SFT). Las variables estudiadas fueron rendimiento total,
rendimiento comercial, número de tubérculos por planta, peso del tubérculo por planta. La variedad
INIA-303 Canchan, mostró respuestas positivas a las combinaciones de fuentes de fertilización de
nitrógeno y fósforo bajo las condiciones del suelo y el clima donde se realizó la investigación. En la
combinación NA+FDM se encontró el mayor rendimiento total, rendimiento comercial, número y peso
de tubérculos por planta (P<0.01). Las mezclas recomendadas para la fertilización de la variedad de
papa Canchan INIA-303, para lograr rendimientos entre 32,45 t ha-1
a 33,98 t ha-1
, bajo las condiciones
del área de estudio son NA+FDM, SA+FMA y NA+FMA.
2. 9256
Rev. Fac. Nac. Agron. Medellín 73(3): 9255-9261. 2020
Pinedo-Taco R, Olivas-Alvarado T, Rodríguez-Soto G, Castro-Cepero V
P
otato (Solanum tuberosum L.) is one of the most
important crops in Peru in economic and food
terms. The high Andean region has the biggest
surface of the crop, with more than 730,000
producers in 317,647 ha approximately. However, at
the coastal level, it is managed with improved varieties
(Pradel et al., 2017). The INIA-303 Canchan INIA variety
was produced by the National Institute of Agricultural
Innovation (INIA), showing precocity, resistance to
Phytophthora, and capability of adapting to various
agroclimatic conditions (Fonseca, 1996). It is considered
one of the most used varieties in potato production in
the Andean region and the Peruvian coast (Egusquiza,
2014; Pradel et al., 2017).
The availability of primary (N, P, K) and secondary (S,
Ca, Mg) nutrients and minor elements (B, Mn, Zn, Fe)
are required to obtain the best yield potential. Mineral
nutrients extracted by potatoes depend on the substrate
conditions, the fertilization practice, and the variety
sown (Egusquiza, 2014; Mokrani et al., 2018; Morales-
Hernández et al., 2013; Niquin et al., 2018).
Peruvian coastal soils are deficient in nitrogen and
phosphorus; therefore, the supply of macronutrients
is essential. The required amounts of nitrogen,
phosphorus, potassium (NPK) are 120 to 180 kg N, 60
to 100 kg of P2
O5
, and 0 to 80 kg of K2
O for potato crops
(Egusquiza, 2014).
Nitrogen is the nutrient that most affects the yield and
quality of tubers (Alva, 2004; Mokrani, 2018; Oliver,
2017). High doses of N promote foliage growth, but
delay the initiation of tuberization and reduce yield and
quality by decreasing the percentage of dry matter in the
tubers (Alva, 2004; Suárez et al., 2006). The potato crop
can absorb N in the form of nitrate (NO3
-
) and ammonia
(NH4
+
), which depend on the age of the plant and the
pH of the soil. However, as the availability of nitrate
increases, the plant has higher growth rates (Pumisacho
and Sherwood, 2002).
Phosphorus is an essential macronutrient in respiration
and photosynthesis plant processes. It is part of
nucleoproteins, lipids, and phospholipids. It acts on the
roots development and meristematic tissues (Salisbury
and Ross, 2000; Pumisacho and Sherwood, 2002;
Bernal and Espinosa, 2003). Regarding potassium, a
crop with high yields can absorb more than 340 kg ha-1
of K2
O (MINAGRI, 2011). In potato cultivation, K is
needed for the transport of sugars from leaves to the
tubers (Becerra-Sanabria et al., 2007).
The national average potato yield was 13.72 t ha-1
in 2011, being Lima (23.90 t ha-1
) and Arequipa
(32.77 t ha-1
), the departments that contributed the most
(MINAGRI, 2012). By 2016, Peru was ranked as the 14th
country in potato production worldwide; however, its
productivity level (14.78 t ha-1
) is 26% lower than the
world average. The regions of Arequipa, Ica, and Lima
achieved the best average yields with 33.5, 32.2, and
22.7 t ha-1
, respectively (MINAGRI, 2017). However, it
was not enough since the national average yield has
not increased significantly over the last 20 years. On
the Peruvian coast, the increase in potato productivity
is due to the improved varieties, good quality seed, and
high levels of fertilization. However, the soil salinization
levels can negatively affect the high dependence on
mineral fertilizers (Marchese, 2015). Therefore, the
present study was conducted to evaluate the effect of
nitrogen and phosphorus fertilization sources and their
interaction on the potato cultivation yield under the soil
and climate of Peruvian coast conditions.
MATERIALS AND METHODS
The investigation was carried out at the Lagunas
farm, in the town of Vinto Bajo, district and province of
Barranca in the department of Lima, located at 49 masl,
with geographical coordinates, latitude 10°45'1'' and
longitude 77°45'1''. The soil was sandy loam texture,
with slightly alkaline pH (7.53), high amount of CaCO3
(5.25%), low organic matter (0.75%), low phosphorus
concentration (6.2 ppm), average potassium content
(101 ppm), and 1.31 dS m-1
of electrical conductivity
(qualified as very slightly saline). According to MINAGRI
(2011), the acceptable pH for potato production ranges
from 5 to 7.
The maximum temperature occurred during the seedling
emergence and the minimum temperature in the
fIowering stage (Figure 1). Low temperatures promoted
the tuberization phase, reaching values of 16.7 °C. The
mediumtemperatureduringcropdevelopmentfluctuated
between 10.75 °C and 20.05 °C. The temperature
3. 9257
Rev. Fac. Nac. Agron. Medellín 73(3): 9255-9261. 2020
Effect of nitrogen and phosphorus fertilization sources on the potato crop yield (Solanum tuberosum L.)
between sowing and germination should range between
18-24 °C and 15-22 °C during the growing period. An
optimal temperature during the potato tuber bulking
phase is 14-18 °C because lower than 10 °C and upper
than 30 °C could inhibit the tuber development (Kim and
Lee, 2019; MINAGRI, 2012).
Figure 1. Variation in medium monthly temperature during the experimental phases: Sproud development (30 days after sowing (DAS)); stem
and leaf formation and tuber initiation (60 DAS); fIowering (75 DAS); tuber bulking (90 DAS); maduration (120 DAS).
The genetic material used for sowing was the improved
varietyINIA-303Canchan,widelyusedinthemainpotato
producing areas of the Peruvian coast since farmers can
obtain up to 30 t ha-1
in the 120 days (MINAGRI, 2012).
A 3×3 factorial randomized block design was established
with three nitrogen fertilization sources and three
phosphorus fertilization sources as independent factors
(nine treatments and four repetitions) (Table 1).
Urea[CO(NH2
)2
]with46%N,AmmoniumNitrate(NO3
NH4
)
with 33% N and Ammonium Sulfate SO4
(NH4
)2
with
21% N and 24% S were used as nitrogen fertilization
sources. Diammonium Phosphate [(NH4
)2
HPO4
] with
18% of N and 46% of P2
O5
, Triple superphosphate
(H2
PO4
)2
with 46% P2
O5
, and Monoammonium
Phosphate (NH4
H2
PO4
) with 11% N and 52% P2
O5
were used as phosphorus sources (Reetz, 2016).
Table 1. Factors under study.
F1: Nitrogen Sources F2: Phosphorus Sources F1×F2 Treatments
N1: Urea P1: Diammonium phosphate (DAP) 1: N1P1 4: N2P1 7: N3P1
N2: Ammonium nitrate (AN) P2: Triple superphosphate (TSP) 2: N1P2 5: N2P2 8: N3P2
N3: Ammonium sulfate (AS) P3: Monoammonium phosphate (MAP) 3: N1P3 6: N2P3 9: N3P3
The treatments were composed of the combinations
of the factors under study (Table 1). The NPK fertilizer
formula for all treatments was 276, 166, and 250 kg of
N, P2
O5
, and K2
O, respectively. The potato crop usually
requires large amounts of K (MINAGRI, 2011).
Fertilization was carried out manually and fractionally.
In the sowing period, 60% of P and 36% of N was
applied. 46 days after sowing (DAS), the second
fertilization was performed, which corresponds to
36% N and 40% P. On 66 DAS, 28% N was added.
N was applied fractionally on two stages, according
to Egusquiza (2014), 50% N+PK during the sowing
period and then at the first hilling period other 50% N.
Tuber number per plant (TNPP), total weight tuber per
plant (TWPP), Total (TY), and Commercial (CY) yield
were evaluated as the dependent variables (Table 2).
The data obtained for the treatments applied were
analyzed, assuming normality and significance of
variance by Shapiro-Wilk and Fisher tests (P<0.05),
15
16
17
18
19
20
21
Sproud development Step and leaf fortmation, tuber
initiation
Flowering Tuber bulkng Maduration
Mediummontlytemperature°C
Phenological stages of potato cultivation
(°C)
4. 9258
Rev. Fac. Nac. Agron. Medellín 73(3): 9255-9261. 2020
Pinedo-Taco R, Olivas-Alvarado T, Rodríguez-Soto G, Castro-Cepero V
Table 2. Variables under study and evaluation procedure.
Variables under study Procedure
Tuber number per plant (TNPP) Fiveplantswererandomlyselectedfromthecentralrowsofeachexperimental
unit. The number of tubers per plant was then averaged.
Tuber weight per plant (TWPP) Five plants were chosen at random from the central rows of each experimental
unit. The tubers were weighed per plant and expressed in kg per plant.
Total yield (TY) and commercial yield (CY) Ten linear meters were harvested for each experimental unit, and the yield
was expressed in t ha-1
. Commercial categories was taken into consideration
and expressed in t ha-1
.
respectively. Once these assumptions were verified, data
were subjected to a two-way ANOVA. Mean values were
compared using the Duncan test (P<0.05). All analyses
were performed by the statistical software Infostat (Di
Rienzo et al., 2011).
RESULTS AND DISCUSSION
Nitrogen sources, phosphorus sources, and their
respective interaction were highly significant (P<0.01)
for total yield and tuber weight per plant; whereas, for
commercial yield and the number per plant, the nitrogen
sources, phosphorus sources, and their respective
interaction were significant at P<0.05. The interaction
of the fertilization sources also presented an effect on
the variables. Therefore, there was no infIuence of an
uncontrolledfactorvariationintheexperiment(Table3).
Table 3. Values of F, significance, and coefficients of variation (CV) for total yield Commercial yield, Tuber number per plant, Tuber weigh per
plant, by nitrogen and phosphorus fertilization sources.
Sources of variation TY CY TNPP TWPP
Nitrogen Sources (N) 40.419** 31.374** 3.034* 0.052**
Phosphorus sources (P) 15.919** 12.928** 2.621* 0.023**
N×P 6.598** 5.674* 2.384* 0.036**
Error 0.665 1.711 0.755 0.002
CV (%) 2.62 4.81 8.44 4.13
*P<0.05; **P<0.01
TY: Total Yield; CY: Commercial Yield; TNPP: Tuber number per plant; TWPP: Tuber weigh per plant; CV: Coefficient of variation.
The highest total yield (TY) was found with the
N2P1 (AN+DAP) treatment and was higher than the
combinations N3P3 (AS+MAP) and N2P3 (AN+MAP)
by 3.03% and 4.71%, respectively. For the nitrogen
fertilization sources, it could be most recommended
the AN and for phosphorus sources, the DAP and MAP
according to the soil and climate conditions of the study
(Figure 2).
Yields of the urea combinations with DAP, MAP, and TSP
were lower compared to the two combinations described
above. It could be due to urea does not respond in alkaline
or slightly alkaline soils (Cépeda, 2010). The AN has a
better response in coastal conditions because the plant
develops better when nitrates are available (Pumisacho
and Sherwood, 2002), while AS improves the assimilation
of P because its acidifying effect reduces soil pH.
According to (MINAGRI, 2011), in strongly alkaline soils,
the availability of minor elements is low, which can affect
crop yield. Urea is recommended for acidic and neutral
soils because, in limestone soils, significant nitrogen
losses can occur due to volatilization (Cépeda, 2010).
The acidity index of urea, AN, and AS (-84, -63, and -110,
respectively) is a favorable factor for temporarily buffering
soil pH. Excessive acidification can affect the availability of
5. 9259
Rev. Fac. Nac. Agron. Medellín 73(3): 9255-9261. 2020
Effect of nitrogen and phosphorus fertilization sources on the potato crop yield (Solanum tuberosum L.)
nutrientsforplantgrowth,thelevelsofphytotoxic elements,
the microbial activity, and even the physical conditions of
the soil (Cépeda, 2010; Presutti et al., 2017). Gutiérrez
(2015) stated that the management of nitrogen fertilization,
intermsofdose,time,andmethodofapplication,infIuences
the yield and quality of the potato tuber. Optimal nitrogen
fertilization and irrigation water management are important
to improve nitrogen uptake efficiency and minimize N
losses (Alva, 2004). The management of these factors
is a challenge in the different soils where potatoes are
grown, which are generally vulnerable to water leaching
and soluble nutrients (Sifuentes et al., 2015). In general,
fertilizers with a high content of ammonium nitrogen
Figure 2. Total yield of INIA-303 Canchan tubers (t ha-1
) with the interaction of nitrogen and phosphorus sources. Different letters within the
nitrogen source mean a significant difference (P>0.05).
origin can acidify soils when they are applied repeatedly.
Microorganisms in the soil convert the nitrogen from
ammonium (NH4
+
) to nitrate (NO3
ˉ), thus releasing ions
H+
, which acidify the soil (Wadas and Dziugiel, 2015).
For commercial yield (CY), the highest value was achieved
byAN+DAP,whichwasstatisticallysimilartotheAN+MAP.
AN+TSP was the lowest value (26.10 t ha-1
) and is different
fromothertreatments.ThecombinationAS+MAPachieved
the best value (29.18 t ha-1
), but it did not have a statistical
significance (Figure 3). The combinations of urea with
DAP, TSP, and MAP showed a lower yield, possibly due
to the acidity index of the fertilizers used.
Figure 3. Interaction of nitrogen and phosphorus sources in the commercial yield of INIA-303 Canchan tubers (t ha-1
). Different letters within
the nitrogen source mean a significant difference (P>0.05).
29.12a
27.19c
30.79a
33.96a
30.29c
32.45b 31.46b 32.10b 32.98a
0
5
10
15
20
25
30
35
40
DAP TSP MAP DAP TSP MAP DAP TSP MAP
UREA AN AS
Totalyield(tha-1)
Fertilization sources
25.88a
23.70b
26.33a
29.64a
26.10b
28.24a 27.29a 28.15a
29.18a
0
5
10
15
20
25
30
35
DAP TSP MAP DAP TSP MAP DAP TSP MAP
UREA AN AS
Commercialyield(tha-1)
Fertilization sources
6. 9260
Rev. Fac. Nac. Agron. Medellín 73(3): 9255-9261. 2020
Pinedo-Taco R, Olivas-Alvarado T, Rodríguez-Soto G, Castro-Cepero V
According to MINAGRI (2017), the average yield at
the coastal level was 25 t ha-1
. Both the total yield and
commercial yield were above the national average
(14.5 t ha-1
). Soil fertility is a quality resulting from the
interaction between the physical, chemical, and biological
characteristics of the soil, and it consists of the capacity
to provide necessary conditions for plant growth and
development (Egusquiza, 2014). Soil pH has an indirect
infIuence on chemical processes, nutrient availability,
biological processes, and microbial activity (MINAGRI,
2011).
ThehighestTNPPandTWPPwerefoundbytheAN+DAP
(Figure 4 and Figure 5). AN+DAP combination, for the
TNPP variable, was higher than AN+MAP and AS+MAP
treatments with 4.90% and 15.72%, respectively.
AN+DAP was higher than AS+MAP and AN+MAP with
3.03% and 4.71%, respectively for the TWPP variable.
The highest TNPP average was 11.85, while the highest
TWPP was 1,214 kg per plant. According to Egusquiza
(2014) and INIA (2012), the cultivar INIA-303 Canchan
has 20 tubers per plant as the average TNPP, while the
average TWPP can reach 1 kg per plant.
Figure 4. Effect of the combination of nitrogen and phosphorus sources in the variable tuber number per plant yield (TNPP). Different letters
within the nitrogen source mean a significant difference (P>0.05).
Figure 5. Effect of the combination of nitrogen and phosphorus sources in the tuber weight per plant yield (TWPP). Different letters within the
nitrogen source mean a significant difference (P>0.05).
9.90a
9.55a 9.70a
11.85a
9.20b
10.85a 10.35a 10.60a 10.65a
0
2
4
6
8
10
12
14
DAP TSP MAP DAP TSP MAP DAP TSP MAP
UREA AN AS
Tubernumberperplant
Fertilization sources
0.94a 0.95a 0.99a
1.21a
0.97b
1.05a
1.00b 1.03b
1.58a
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
DAP TSP MAP DAP TSP MAP DAP TSP MAP
UREA AN AS
Tuberweightperplant(kg)
Fertilization sources
7. 9261
Rev. Fac. Nac. Agron. Medellín 73(3): 9255-9261. 2020
Effect of nitrogen and phosphorus fertilization sources on the potato crop yield (Solanum tuberosum L.)
CONCLUSIONS
The INIA-303 Canchan cultivar showed positive response
tothecombinationsofnitrogenandphosphorus fertilization
sourcesunderthesoilandclimateconditionsofthePeruvian
coast. The total and commercial yield, tuber number per
plant and tuber weigh per plant were significantly affected
by the interaction of nitrogen and phosphorus sources. The
highest total yield, commercial yield, number and weight
of tubers per plant were found with the combination of
ammonium nitrate+diamonic phosphate. The three most
recommended mixtures for the fertilization of the INIA-
303 Canchan potato variety sown in Peruvian coast, to
achieve yields between 32.45 t ha-1
and 33.98 t ha-1
, are
ammonium nitrate+diammonium phosphate, ammonium
sulfate+monoammonium phosphate, and ammonium
nitrate+monoammonium phosphate.
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