1. The document discusses calculating plant population, seed requirement, and seed rate for various crops. It provides formulas and examples for determining plant population based on spacing, estimating spacing given population, and calculating seed rate based on population, test weight, germination, and purity percentage.
2. Several exercises are included to demonstrate calculating seed rate for crops like rice, sorghum, maize, groundnut, green gram, and pigeonpea using given parameters like spacing, population, test weight, germination, and purity.
3. The final examples discuss estimating seed requirement for a research plot and per row based on seed rate per hectare, and calculating hybrid cotton seed rate for one acre area.
this slide includes recent approaches to evaluate cropping system.
It includes system profitability,relative production efficiency,land use efficienct(LUE),Calculation of LUE,energy efficiency,specific energy,Rotational intensity,Cropping intensity,Multiple cropping index(MCI),Land equivalent ratio (LER),Relative yields total (RYT),Crop equivalent yields (CEY),Relative Spread Index
this slide includes recent approaches to evaluate cropping system.
It includes system profitability,relative production efficiency,land use efficienct(LUE),Calculation of LUE,energy efficiency,specific energy,Rotational intensity,Cropping intensity,Multiple cropping index(MCI),Land equivalent ratio (LER),Relative yields total (RYT),Crop equivalent yields (CEY),Relative Spread Index
High Density Planting is a method of densely planting plant with plant population more than the optimum to get higher productivity in terms of quality and yield by manipulating the tree architecture and planting systems such as use of dwarfing rootstock, interstocks, scions, spurs; intensive use of growth regulators, training and pruning, cultural practices and reducing the spacing. The main principle is to improve efficiency of horizontal and vertical space utilisation per unit time, and resources and input utilisation. There is a balance between the vegetative and fruiting structures without affecting the plant health. Advantages include increased productivity, high income, efficient use of resources and mechanisation and operational efficacy
Bangladesh is an agricultural based country located in South Asia. Agriculture is the prime occupation of the major peoples in Bangladesh. In 1947-48 Bangladesh grown about 80% of total jute in the world which produced lot of foreign money that was majority of the total revenue of the country. For this reason jute is called as "Golden Fiber" of Bangladesh. Jute is one of the cheapest and the strongest of all natural fibres and considered as fibre of the future. Raw jute is the natural fibre which is extremely eco-friendly. Bangladesh is the biggest producer of natural jute or raw jute fibre both in quantity and quality .The other countries grow Jute plant are India, Nepal, China, Myanmar, Vietnam, Thailand etc.
Training is an important operation in grapes.
It helps to maintain the stature and spread of the vine and facilitates operations like pruning, intercultivation, spraying and harvesting.
Many training systems are in vogue in India, but the most popular are Bower, Telephone and Kniffin systems.
Pulses are a very important source of protein in Indian diets as majority of population is vegetarian. however, the production of pulses is not keeping pace with the growing population in the country. lentil is one of the important Rabi pulses. it is one of the oldest pulse crops and the most nutritious of the pulses. it is also used as a cover crop to check the soil erosion in problem areas. lentil contributes about 6% in total pulses area as well as production of India. It is mostly eaten as "DAL". the pulse is first converted into split pulse or 'dal' by the removal of skin and the separation of the fleshy cotyledons. It is cooked easily and hence preferred. It is good for patients too. Lentil contains about 11% water, 25% protein and 60% carbohydrates. It is also rich in calcium, iron and niacin
The Contingency plans cover contingency strategies to be taken up by farmers in response to major weather related aberrations such as delay in onset and breaks in monsoon causing early, mid and late season droughts, floods, unusual rains, extreme weather events such as heat wave, cold wave, frost, hailstorm and cyclone.
This ppt is about the distribution of wasteland and problem soils. Those lands are wastelands which are ecologically unstable,
whose topsoil has nearly been completely lost, and
which have developed toxicity in the root zones or growth of most plants, both annual crops and trees”.
The use of linear programming to integrate forest operationsAtrium Forest
Apresentação de Silvana Nobre, socio-fundadora da Atrium Forest Consulting durante o ciclo de seminários em Pesquisa Florestal Avançada na Universidade Politécnica de Madrid, em 20 de fevereiro de 2013.
High Density Planting is a method of densely planting plant with plant population more than the optimum to get higher productivity in terms of quality and yield by manipulating the tree architecture and planting systems such as use of dwarfing rootstock, interstocks, scions, spurs; intensive use of growth regulators, training and pruning, cultural practices and reducing the spacing. The main principle is to improve efficiency of horizontal and vertical space utilisation per unit time, and resources and input utilisation. There is a balance between the vegetative and fruiting structures without affecting the plant health. Advantages include increased productivity, high income, efficient use of resources and mechanisation and operational efficacy
Bangladesh is an agricultural based country located in South Asia. Agriculture is the prime occupation of the major peoples in Bangladesh. In 1947-48 Bangladesh grown about 80% of total jute in the world which produced lot of foreign money that was majority of the total revenue of the country. For this reason jute is called as "Golden Fiber" of Bangladesh. Jute is one of the cheapest and the strongest of all natural fibres and considered as fibre of the future. Raw jute is the natural fibre which is extremely eco-friendly. Bangladesh is the biggest producer of natural jute or raw jute fibre both in quantity and quality .The other countries grow Jute plant are India, Nepal, China, Myanmar, Vietnam, Thailand etc.
Training is an important operation in grapes.
It helps to maintain the stature and spread of the vine and facilitates operations like pruning, intercultivation, spraying and harvesting.
Many training systems are in vogue in India, but the most popular are Bower, Telephone and Kniffin systems.
Pulses are a very important source of protein in Indian diets as majority of population is vegetarian. however, the production of pulses is not keeping pace with the growing population in the country. lentil is one of the important Rabi pulses. it is one of the oldest pulse crops and the most nutritious of the pulses. it is also used as a cover crop to check the soil erosion in problem areas. lentil contributes about 6% in total pulses area as well as production of India. It is mostly eaten as "DAL". the pulse is first converted into split pulse or 'dal' by the removal of skin and the separation of the fleshy cotyledons. It is cooked easily and hence preferred. It is good for patients too. Lentil contains about 11% water, 25% protein and 60% carbohydrates. It is also rich in calcium, iron and niacin
The Contingency plans cover contingency strategies to be taken up by farmers in response to major weather related aberrations such as delay in onset and breaks in monsoon causing early, mid and late season droughts, floods, unusual rains, extreme weather events such as heat wave, cold wave, frost, hailstorm and cyclone.
This ppt is about the distribution of wasteland and problem soils. Those lands are wastelands which are ecologically unstable,
whose topsoil has nearly been completely lost, and
which have developed toxicity in the root zones or growth of most plants, both annual crops and trees”.
The use of linear programming to integrate forest operationsAtrium Forest
Apresentação de Silvana Nobre, socio-fundadora da Atrium Forest Consulting durante o ciclo de seminários em Pesquisa Florestal Avançada na Universidade Politécnica de Madrid, em 20 de fevereiro de 2013.
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HYBRID SEED PRODUCTION IN MAIZE\
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Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
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This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
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The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
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This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
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Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
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• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
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Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Agronomy Practical on Estimation of Seed requirement and plant population of field crops-calibration
1. Agronomy Practical on Plant Population and Seed Requirement: Presented by
Dr.G.S.Tomar, Professor (Agronomy), CARS, Mahasamund (C.G.) for B.Sc.Ag.Students
Page 1 of 8
PRACTICAL
ESTIMATION OF PLANT POPULATION AND SEED REQUIREMENT OF
KHARIF CROPS
Seed rate is the quantity of seed of a crop that is required to sow in a unit area of land for
optimum plant population and crop production. Establishing a good plant stand in the field is
important to ensure good crop yields. Plant stand is expressed either as space between plants or
as an optimum plant population per unit area. We can determine the plant population if
information on plant spacing is provided. Similarly, if optimum plant population is given, then
inter-row and intra-row spacing can be determined. The required number of plants/unit area is
decided by calculating the seed rate. The seed rate depends on spacing or plant population, test
weight, germination and purity percentage.
Objectives
To know the quantity of seed needed for sowing in advance.
To prevent seed wastage from excess sowing such reduces the initial cost of production.
To maintain optimum plant population in the field for higher yield harvest.
(a) Estimation of Plants Population per hectare
If the spacing of plants within the row and spacing between rows are known, then we can
calculate the number of plants in one hectare. For example, if the row width is 0.75 m and plants
are spaced 15 cm apart in the row, the final plant population assuming 100 % germination and no
plant mortality, would be (1 ha =10,000 sq m)
10,000 sq m
Plants population per hectare = -------------------------
Plant Spacing in sq m
10,000 sq m
Plants per hectare = ------------------------ = 88,888.88 plants/ha
0.75 m x 0.15 m
Likewise, if the crop is planted in hills the calculation made is:
10000 m2 x No. of seeds/hill
Plant population/ha=--------------------------------------------
Row width (m) x hill spacing (m)
Thus planting in 50 cm width with 50 cm between hills and two seeds are planted per hill will
results:
2. Agronomy Practical on Plant Population and Seed Requirement: Presented by
Dr.G.S.Tomar, Professor (Agronomy), CARS, Mahasamund (C.G.) for B.Sc.Ag.Students
Page 2 of 8
10000 x 2
=------------------------ = 80,000 plants/ha.
0.5 m x 0.5 m
(b) Estimation of Intra-row Spacing
We can calculate the spacing between the plants within a row, if row width and plant
population per ha are known. If row width = 0.75 m and plant population per ha = 150,000, is
given. Find the spacing between plants and within a row.
Step 1: Calculate the row length in hectare based on the row width.
= 10,000 sq m / 0.75 m = 13333 m
Step 2: Calculate the spacing between plants within this row.
150,000 plants are present in a row of 13333 m so, spacing between two plants =
13333 m /150,000 = 0.0888 m or 8.88 cm.
Therefore, if 150,000 plants are to be established per ha and a spacing of 75 cm is used
between the rows, then the plants are to be 8.88 cm apart in the row. Based on this spacing
between the plants, excess plants in a row can be removed.
(c) Determination of Seed Requirement
Seed rate for a particular crop determines the final plant population of particular crop.
Correct quantity of seed with good germination percentage (usually 95-98%) should be used to
maintain optimum plant stand for getting higher yield. The quantity of seed required per unit
area (seed rate) differs from crop to crop and it depends upon the spacing, test weight (1000 seed
weight for small seeds and 100 seed weight for large seeds), no. of seedlings per hill,
germination percentage, variety, cropping system and risk factors and soil fertility etc.
We can calculate the amount of seed required to establish a desired plant stand in the
field considering the quality of the seed. The seed-lot should be examined before sowing and
any deficiency should be adjusted by increasing the seed rate, to obtain the desired plant
stand. Seed rate for a crop depends upon seed size or test weight, desired plant population,
germination percentage and purity percentage of seed.
Area to be sown or plant population/ha.x No. of seeds/hill x Test wt. (g) x 100
Seed rate (kg/ha) =------------------------------------------------------------------------------------------
1000 x 1000 x Germination % x Purity %
3. Agronomy Practical on Plant Population and Seed Requirement: Presented by
Dr.G.S.Tomar, Professor (Agronomy), CARS, Mahasamund (C.G.) for B.Sc.Ag.Students
Page 3 of 8
Exercise-1: Calculate the seed rate for transplanted rice, if spacing 20 x 20 cm, seedlings per hill
=2, germination % = 90, purity % = 95, test weight = 26 g and damaged seedlings as % of
uprooted seedlings = 12 is given.
Solution:
Total no. of seedlings to be uprooted from nursery = no. of seedlings required for
transplanting + no. of damaged seedlings at uprooting + no. of seedlings required for gap filling.
10000 x No. of seedlings per hill
No. of seedlings required for transplanting/ha =-----------------------------------------
Hill spacing
10000 x 2
= ---------------- = 500000
0.2 x 0.2
Seedlings required for transplanting x 12 500000 x 12
Damaged seedlings =----------------------------------------- = --------------
100 100
= 60,000
Total no. of seedlings to be uprooted = 500,000 + 60,000 = 5, 60,000 seedlings
No. of seedlings required/ha x test weight x 100 x 100
Seed rate for transplanted rice =-----------------------------------------------------------------
1000 x 1000 x Germination % x Purity %
5, 60,000 x 26 x 100 x 100
=---------------------------------= 17.02 kg/ha seed is needed.
1000 x 1000 x 95 x 90
Exercise-2 : If rice is to be sown at 20 x 5 cm distance and seed possesses 95 % germination, 90
% purity with a test weight of 26 g. Damaged seedlings by birds to be replaced by seed is 11
seeds per sq m. Calculate the seed rate for direct sown rice.
Solution:
Total number of seeds required = Total no. of seeds required per ha + no. of seeds needed
for replacing damaged seeds.
10000 10000
No. of seeds required per ha =------------- = --------------= 1000000 seeds
Spacing 0.20 x 0.05
No. of damaged seeds per ha = 10000 x 11 = 11000 seeds
Total no. of seeds required = 10110000 seeds
Total no. of seeds/ha x test weight x 100 x 100
Seed rate kg/ha = ---------------------------------------------------------
1000 x 1000 x 95 x 90
4. Agronomy Practical on Plant Population and Seed Requirement: Presented by
Dr.G.S.Tomar, Professor (Agronomy), CARS, Mahasamund (C.G.) for B.Sc.Ag.Students
Page 4 of 8
1011000 x 26 x 100 x 100
=-----------------------------------= 30.74 kg/ha
1000 x 1000 x 95 x 90
Exercise-3 : Calculate the seed rate of sorghum for seeds having 70 % germination, test weight
of 2.8 g, and the required plant population is 250000 plants per ha.
Solution:
Since the seed germination is only 70 %, we need to adjust for this deficiency.
100 x 100
Number of seeds needed to get 100 seedlings = ------------------ = 142 seeds
70
250,000 x 142
Then, the number of seeds required for 250,000 plants =------------------- = 355,000
100
Thus, 355000 seeds are needed to establish stands of 250,000 plants per ha.
355000 x 2.8 g
The quantity of seed required per ha = ---------------------= 9940 g = 9.94 kg
100
Thus, 9.94 kg of seeds is needed per ha.
Exercise-4: Calculate the quantity of maize seed for sowing in one hectare area from the
following particulars
Spacing-75 cm x 30 cm, germination of the seeds-90 %, purity of the seeds-90%, seeds required
for gap filling-5 % by weight of seeds required for sowing and test weight of the seeds-250 g.
Solution:
10000 m2
Plant population =---------------------= 44444.44
0.75 m x 0.3 m=0.225
44444.44 x 250 x 100 x 100
=--------------------------------------------= 13.71 kg/ha
1000 x 1000 x 90 x 90 =810000
Quantity of seed required for gap filling at the rate of 5 % of seed weight
13.71 x 5
=-----------------=0.685 kg/ha
100
Total quantity of seed required for sowing/ha would be 13.71 kg + 0.685 kg
=14.39 kg/ha.
Exercise-5: Calculate the seed rate of groundnut in kg/ha from the following details: spacing-50
cm x 20 cm, germination of seed-92%, purity of seed-95%, test weight of kernels-200 g and
shelling percentage-60. The seed rate is to be calculated in terms of weight of kernels as well as
unshelled pods.
5. Agronomy Practical on Plant Population and Seed Requirement: Presented by
Dr.G.S.Tomar, Professor (Agronomy), CARS, Mahasamund (C.G.) for B.Sc.Ag.Students
Page 5 of 8
10000 m2
Plant population=----------------------=100000
0.5 m x 0.2 m
100000 x 200 x 100 x 100
Seed rate of kernels (kg/ha)=----------------------------------------------= 22.88 kg/ha
92 x 95 x 1000 x 1000
Amount of unshelled pods needed for sowing (kg/ha)
Amount of kernels (kg/ha) x 100 22.88 x 100
=----------------------------------------------- =-----------------= 38.33 kg/ha
Shelling percentage 60
Ans.: Seed rate of groundnut as kernels= 22.88 kg/ha and as unshelled pods is 38.33 kg/ha.
Exercise-6: Calculate the seed rate of Green gram for sowing in one hectare of land from the
following: spacing-30 cm x 10 cm, germination-92 %, purity-85 % and 1000 grain weight-36 g.
Solution:
10000 m2
Plant population=----------------------=333333.33
0.3 m x 0.1 m
333333.33 x 36 x 100 x 100
=-------------------------------------------=15.34 kg/ha
92 x 85 x 1000 x 1000
Exercise-7: Calculate the seed rate of Pigeonpea for sowing in one hectare of land from the
following: spacing-60 cm x 25 cm, germination-87 %, purity-86 % and 1000 grain weight-70 g.
Solution:
10000 m2
Plant population=----------------------= 66666.67
0.6 m x 0.25 m
66666.67 x 70 x 100 x 100
=--------------------------------------= 6.23 kg/ha
87 x 86 x 1000 x 1000
Estimation of seed Quantity per row
Experimental plot size = 8 m x 4 m
Given: Sorghum seed with 70 % germination, 100-seed weight of 2.8 g and number of rows per
plot = 8, row spacing = 50 cm, seeds required per ha = 9.94 kg (as in previous example) and
population required: 250,000 plants per ha.
Based on the amount of seeds need to be used per ha, we can calculate the required seeds per plot
and per row for research plots.
6. Agronomy Practical on Plant Population and Seed Requirement: Presented by
Dr.G.S.Tomar, Professor (Agronomy), CARS, Mahasamund (C.G.) for B.Sc.Ag.Students
Page 6 of 8
9.94 kg x 1000 g/kg
Seeds needed per sq m = ----------------------------- = 0.994 g
10,000 sq m
Plot area = (8m x 4m) = 32 sq m. Thus, seed weight per plot =0.994 x 36 = 31.80 g.
Now, calculate the amount of seeds per row.
Single row area = length x width (spacing) = 8 m x 50 cm = 4.0 sq m
Seeds required per row =0 .994 x 4.0 = 3.997 g
Exercise-1: Suppose the required plant density Pigeonpea is 333 000 plants/ha, 100-seed weight
is 10 g and germination is 90 %. The seed requirement per ha and a plot of 15 m2 (3 m x 5 m)
with eight rows of 5 m length and 0.375 m between rows can be calculated.
Solution
(i) The seed required for 100 germinable seed for this lot is
100 seeds
-------------= 111 seeds
0.90
Therefore, to obtain 100 seedlings at least 111 seed should be sown as germination of the
seed lot was 90 %.
(ii) The seed required for 333 000 plants/ha
333 000 seeds/ha x 111 seeds
=......................................................= 369 630 seeds/ha
100 seeds
(iii) Mass (kg) of 369 630 seeds @ 10 g for 100 seeds will be
369 630 seeds x 10 g
=......................................= 36.9 kg or 37 kg/ha
1000 g/kg x 100 seeds
(iv) To sow 20 % additional seed the requirement will be
37 kg/ha x 1.20 = 44.4 kg/ha
(v) The seed required m-2
will be
44.4 kg/ha x 1000 g/kg
=........................................= 4.44 g m-2
10,000 m2
or ha
(vi) The seed requirement for plot (15 m2
) will be
= 4.44 g m-2 x 15 m2
/plot = 66.6 g or 67 g/plot
(vii) The seed requirement /row will be
(The area of row is 5 m x 0.375 m = 1.875 m2
/row)
7. Agronomy Practical on Plant Population and Seed Requirement: Presented by
Dr.G.S.Tomar, Professor (Agronomy), CARS, Mahasamund (C.G.) for B.Sc.Ag.Students
Page 7 of 8
(viii) Seed requirement/row = 4.44 g m-2 x 1.875 m-2
/row
=8.32 g/row
Exercise-2 : Calculate the seed rate of hybrid cotton for one acre area with following
observation: Spacing = 67.5 X 30 cm, Test weight of fuzzed seed and unfuzzed seed is 140 and
150 g, respectively, Purity percentage = 90. Germination percentage = 80.
Solution
Purity % X Germination %
Real value of seed = -----------------------------------
100 x100
90 X 80
Real value of seed =---------------- =0.72
100 x100
Area in one acre
Plant population needed/Acre =-------------------------------
Plant spacing
4000 x 100 x 100
Plant population needed/ha =----------------------------- = 19753 plants
67.5 x 30
Plant population needed X Weight of one seed
Seed rate Kg/ac. =-------------------------------------------------------------------
Real value of seed X1000X100
19753 x 1.4 X 100
Seed rate (fuzzed seed) needed/ac =----------------------------- = 3.84 kg/ac.
72 X 81 x 1000 X100
19753 x 1.5 x 100
Seed rate (unfuzzed seed) needed/ac =-------------------------- = 4.115 kg/ac.
72 X 81 x 1000 x 100
Assignment
1.Work out the seed requirement of rice (in kg/ha), if
A.Transplanted Rice: Spacing of hills-20 cm x 20 cm, No. of seedlings/hill-3, Germination
of the seed-95 %, Purity of seed-90 %, Test weight-25 g, No. of damaged seedlings at the
time of uprooting-15 (as percentage of uprooted seedlings) and No. of seedlings required for
gap filling-12 per 5 m2 area.
Answer:25.92 kg/ha
B.Upland rice: Approximate spacing/plant-20 cm x 3 cm, Germination of the seeds-95 %,
Purity of the seed-90 %, Test weight-25 g and No. of damaged seeds by birds which need to
be replaced by another seed-10 seeds m2 area.
8. Agronomy Practical on Plant Population and Seed Requirement: Presented by
Dr.G.S.Tomar, Professor (Agronomy), CARS, Mahasamund (C.G.) for B.Sc.Ag.Students
Page 8 of 8
Answer: 51.66 kg/ha
2. Calculate the quantity of maize seed for sowing in one hectare area from the following
particulars
Spacing-75 cm x 20 cm, germination of the seeds-90 %, purity of the seeds-90%, seeds required
for gap filling-5 % by weight of seeds required for sowing and test weight of the seeds-250 g.
Ans.: 22 kg/ha.