Getting the Most from Your Manure - Dr. Daniel Andersen, Iowa State University, from the 2016 Missouri Pork Expo, February 9-10, 2016, Columbia, Missouri, USA.
More presentations at http://www.swinecast.com/2016-missouri-pork-expo
Presentation @boerenverstand London 3/7/19 at the @AgriLondon & @HarperAdams...Frank Verhoeven
Circular agriculture -a bottom up approach
Presentation @boerenverstand London 3/7/19 at the @AgriLondon & @HarperAdamsUni seminar on #circularagriculture
Building Resilience: Holistic Planning, Land Management and Grass-Fed Product...SWGLA
Mimi Sidwell, owner of JX Ranch in Tucumcari, NM, discuss methods she and her husband Tom have implemented to make their ranch and grass-fed operation a success.
Presentation @boerenverstand London 3/7/19 at the @AgriLondon & @HarperAdams...Frank Verhoeven
Circular agriculture -a bottom up approach
Presentation @boerenverstand London 3/7/19 at the @AgriLondon & @HarperAdamsUni seminar on #circularagriculture
Building Resilience: Holistic Planning, Land Management and Grass-Fed Product...SWGLA
Mimi Sidwell, owner of JX Ranch in Tucumcari, NM, discuss methods she and her husband Tom have implemented to make their ranch and grass-fed operation a success.
Nicole Kenney - Fertilizer Price, Manure Value and Farm Sustainability - Pt. 1John Blue
Fertilizer Price, Manure Value and Farm Sustainability - Pt. 1 - Nicole Kenney, University of Minnesota, from the 2014 Iowa Cattle Industry Convention, December 8 - 10, 2014, Des Moines IA, USA
More presentations at http://www.trufflemedia.com/agmedia/conference/2014-iowa-cattle-industry-convention
Dr. Dan Andersen - Manure Nutrient Utilization & Water QualityJohn Blue
Manure Nutrient Utilization & Water Quality - Dr. Dan Andersen, Iowa State University, from the 2017 Iowa Pork Congress, January 25-26, Des Moines, IA, USA.
More presentations at http://www.swinecast.com/2017-iowa-pork-congress
Dr. Dan Andersen - Utilizing Livestock Manure in a Cover Crop ProgramJohn Blue
Utilizing Livestock Manure in a Cover Crop Program - Dr. Dan Andersen, Iowa State University, from the 2018 Iowa Pork Congress, January 24 - 25, 2018, Des Moines, IA, USA.
More presentations at http://www.swinecast.com/2018-iowa-pork-congress
http://www.extension.org/67703 In high yielding row crop intensive regions the role of swine manure as a crop nutrient source has increased in value, replacing the purchase of increasingly expensive commercial fertilizer by providing the nutrient needs of crops. Nutrients from manure are recycled to fertilize high yielding crops in an environmentally friendly, synergistic system.
Access to the value of the nutrients in manure has been a primary motivation for constructing swine facilities. However, as the energy cost of swine diets has increased, feeding programs have been dramatically changed. Changes in ingredients composition has changed from manipulations of dietary formulations. These changes can alter the nutrient composition of the resulting manure and thus the nutrient value of the manure as fertilizer. What does not occur is the consideration that owners/users of the manure composition and if changes need to be made in application rates for optimizing fertilizer rates for crops.
Turfgrass and K: Reviewing the RelationshipChuck Bowen
Potassium is heralded as a nutrient critical for turfgrass stress tolerance – heat, cold, traffic, and water stress are all associated with potassium fertility. In this webinar, experts will discuss the role of potassium in plant physiology and cover the basics on understanding soil and tissue test interpretation for plant available potassium. They will also review the relevant scientific research on potassium and explain why many managers may be using potassium incorrectly.
its ppt presented for climate smart agriculture at africa center of excellence and didn't published any where , the ppt useful fo every one working on climate modeling and metrologists as well as this document is important for the student working on climate change and wants to improve their educational knowledge
Fertilizer value of swine manure: a comparison of a lagoon and a deep pit slu...LPE Learning Center
The full proceedings paper is at: www.extension.org/72744
Since 2000 the cost of fertilizer has more than doubled. According to information provided by the USDA Economic Research Service (2013), the national average price per pound of N has increased between 2000 and 2012 by a factor of 2.6. Over the same time period, phosphate price increased by a factor of 2.8, and potassium price increased by a factor of 4.0. As a result, fertilizer costs now contribute 30% to 40% of the annual variable costs to grow many cereal grains. Table 1. Fertilizer priceDuring the same time period environmental regulations have greatly decreased the construction of swine finishing facilities that use liquid manure handling systems that require the use of a lagoon or storage pond. In response to these economic and regulatory realities, some swine production companies are considering the use of deep pit slurry systems instead of an outdoor lagoon or storage. Benefits of the deep pit slurry system include the exclusion of rainfall, reduction in storage visibility, and conservation of valuable major plant nutrients (N, P, K) for the purpose of reducing production costs for feed grains. The objective of this presentation is to compare the fertilizer value of the manure produced from swine finishing barns that use a liquid manure handling with a treatment lagoon, and swine finishing barns that store manure below slotted floors in pits.
The final presentation by Crop Unit of Lakeland College's Student-Managed Farm (SMF) powered by New Holland. The SMF class is taken by second year crop technology students where they manage, operate and market crop lands at Lakeland College.
“Beef Circular Bioeconomy: N and GHG capture to improve circularity” by Galen Erickson, J.L. Miller, Tala Awada, J. Luck, Konstantinos Giannakas, Ahmed Chennak, and R.R. Stowell at the 2023 Water for Food Global Conference. A recording of the presentation can be found on the conference playlist: https://youtube.com/playlist?list=PLSBeKOIXsg3JNyPowwJj6NDSpx4vlnCYj.
“Beef Circular Bioeconomy: N and GHG capture to improve circularity” by Galen Erickson, J.L. Miller, Tala Awada, J. Luck, Konstantinos Giannakas, Ahmed Chennak, and R.R. Stowell at the 2023 Water for Food Global Conference. A recording of the presentation can be found on the conference playlist: https://youtube.com/playlist?list=PLSBeKOIXsg3JNyPowwJj6NDSpx4vlnCYj.
Nicole Kenney - Fertilizer Price, Manure Value and Farm Sustainability - Pt. 1John Blue
Fertilizer Price, Manure Value and Farm Sustainability - Pt. 1 - Nicole Kenney, University of Minnesota, from the 2014 Iowa Cattle Industry Convention, December 8 - 10, 2014, Des Moines IA, USA
More presentations at http://www.trufflemedia.com/agmedia/conference/2014-iowa-cattle-industry-convention
Dr. Dan Andersen - Manure Nutrient Utilization & Water QualityJohn Blue
Manure Nutrient Utilization & Water Quality - Dr. Dan Andersen, Iowa State University, from the 2017 Iowa Pork Congress, January 25-26, Des Moines, IA, USA.
More presentations at http://www.swinecast.com/2017-iowa-pork-congress
Dr. Dan Andersen - Utilizing Livestock Manure in a Cover Crop ProgramJohn Blue
Utilizing Livestock Manure in a Cover Crop Program - Dr. Dan Andersen, Iowa State University, from the 2018 Iowa Pork Congress, January 24 - 25, 2018, Des Moines, IA, USA.
More presentations at http://www.swinecast.com/2018-iowa-pork-congress
http://www.extension.org/67703 In high yielding row crop intensive regions the role of swine manure as a crop nutrient source has increased in value, replacing the purchase of increasingly expensive commercial fertilizer by providing the nutrient needs of crops. Nutrients from manure are recycled to fertilize high yielding crops in an environmentally friendly, synergistic system.
Access to the value of the nutrients in manure has been a primary motivation for constructing swine facilities. However, as the energy cost of swine diets has increased, feeding programs have been dramatically changed. Changes in ingredients composition has changed from manipulations of dietary formulations. These changes can alter the nutrient composition of the resulting manure and thus the nutrient value of the manure as fertilizer. What does not occur is the consideration that owners/users of the manure composition and if changes need to be made in application rates for optimizing fertilizer rates for crops.
Turfgrass and K: Reviewing the RelationshipChuck Bowen
Potassium is heralded as a nutrient critical for turfgrass stress tolerance – heat, cold, traffic, and water stress are all associated with potassium fertility. In this webinar, experts will discuss the role of potassium in plant physiology and cover the basics on understanding soil and tissue test interpretation for plant available potassium. They will also review the relevant scientific research on potassium and explain why many managers may be using potassium incorrectly.
its ppt presented for climate smart agriculture at africa center of excellence and didn't published any where , the ppt useful fo every one working on climate modeling and metrologists as well as this document is important for the student working on climate change and wants to improve their educational knowledge
Fertilizer value of swine manure: a comparison of a lagoon and a deep pit slu...LPE Learning Center
The full proceedings paper is at: www.extension.org/72744
Since 2000 the cost of fertilizer has more than doubled. According to information provided by the USDA Economic Research Service (2013), the national average price per pound of N has increased between 2000 and 2012 by a factor of 2.6. Over the same time period, phosphate price increased by a factor of 2.8, and potassium price increased by a factor of 4.0. As a result, fertilizer costs now contribute 30% to 40% of the annual variable costs to grow many cereal grains. Table 1. Fertilizer priceDuring the same time period environmental regulations have greatly decreased the construction of swine finishing facilities that use liquid manure handling systems that require the use of a lagoon or storage pond. In response to these economic and regulatory realities, some swine production companies are considering the use of deep pit slurry systems instead of an outdoor lagoon or storage. Benefits of the deep pit slurry system include the exclusion of rainfall, reduction in storage visibility, and conservation of valuable major plant nutrients (N, P, K) for the purpose of reducing production costs for feed grains. The objective of this presentation is to compare the fertilizer value of the manure produced from swine finishing barns that use a liquid manure handling with a treatment lagoon, and swine finishing barns that store manure below slotted floors in pits.
The final presentation by Crop Unit of Lakeland College's Student-Managed Farm (SMF) powered by New Holland. The SMF class is taken by second year crop technology students where they manage, operate and market crop lands at Lakeland College.
“Beef Circular Bioeconomy: N and GHG capture to improve circularity” by Galen Erickson, J.L. Miller, Tala Awada, J. Luck, Konstantinos Giannakas, Ahmed Chennak, and R.R. Stowell at the 2023 Water for Food Global Conference. A recording of the presentation can be found on the conference playlist: https://youtube.com/playlist?list=PLSBeKOIXsg3JNyPowwJj6NDSpx4vlnCYj.
“Beef Circular Bioeconomy: N and GHG capture to improve circularity” by Galen Erickson, J.L. Miller, Tala Awada, J. Luck, Konstantinos Giannakas, Ahmed Chennak, and R.R. Stowell at the 2023 Water for Food Global Conference. A recording of the presentation can be found on the conference playlist: https://youtube.com/playlist?list=PLSBeKOIXsg3JNyPowwJj6NDSpx4vlnCYj.
2017 Oregon Wine Symposium | The Low Down on High Yields: Challenging Yield-Q...Oregon Wine Board
Oregon Pinot noir producers are known for their attention to detail in vineyard management and wine production. It is their uncompromising standards that lead them to the premium quality for which the industry is known. Perhaps the strongest standard has been the adherence to low tonnage guidelines across vineyards and regions in order to achieve maximum quality. How much has the yield per acre metric increased wine quality, and is there room for improvement on these standards? These questions will be addressed through results from the Statewide Crop Load Project, a large-scale industry collaborative research initiative led by OSU Viticulturist Patty Skinkis and more than 20 collaborators in Oregon. This session will include a tasting of six wines, while a panel of collaborating winemakers and viticulturists share their perspective on the wines and the impacts that this research has had on their winery’s production.
Brian vinci-presentation-of-an-economic-model-comparing-open-net-and-land-bas...George Stefanov
Здравейте Г-н Качаров,
За повече яснота относно технологията и специфичността на RAS(Recircullation Aquaculture Systems), рециркулационни затворени системи, тяхната по голяма ефективност по отношение на себестойност на единица продукция, време за добив, контрол и сигурност на продукцията в сравнение с отворени системи, както и подобни такива съоръжения изградени или в процес на изграждане, Ви прилагаме доклад на Conservation Fund USA и Bilund Aquaculture.
Също бих искал да допълня,че сме в контакт и предварителна апликация за сертифициране от Institute for Marketecology (IMO), Швейцария за AquaGAP и ASC(Aquaculture Stewardship Council) сертификати.
Поздрави,
Георги Стефанов
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тел.0884533417
The potential of Accelerated Compost as a fertilizer for maize production in the Forest – savannah transition zone of Nigeria BY O. E. AyanfeOluwa1 O. O. AdeOluwa2 and V.O. Aduramigba-Modupe3
Jordan Hoewischer - OACI Farmer Certification ProgramJohn Blue
OACI Farmer Certification Program - Jordan Hoewischer, Ohio Farm Bureau, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Fred Yoder - No-till and Climate Change: Fact, Fiction, and IgnoranceJohn Blue
No-till and Climate Change: Fact, Fiction, and Ignorance - Fred Yoder, Former President, National Corn Growers Association, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Dr. John Grove - Fifty Years Of No-till Research In KentuckyJohn Blue
Fifty Years Of No-till Research In Kentucky - Dr. John Grove, Univerity of Kentucky, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Dr. Warren Dick - Pioneering No-till Research Since 1962John Blue
Pioneering No-till Research Since 1962 - Dr. Warren Dick, OSU-OARDC (retired), from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Dr. Christine Sprunger - The role that roots play in building soil organic ma...John Blue
The role that roots play in building soil organic matter and soil health - Dr. Christine Sprunger, OSU - SENR, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Dr. Leonardo Deiss - Stratification, the Role of Roots, and Yield Trends afte...John Blue
Stratification, the Role of Roots, and Yield Trends after 60 years of No-till - Dr. Leonardo Deiss, OSU, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Dr. Steve Culman - No-Till Yield Data AnalysisJohn Blue
No-Till Yield Data Analysis - Dr. Steve Culman, OSU Soil Fertility Extension Specialist, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Alan Sundermeier and Dr. Vinayak Shedekar - Soil biological Response to BMPs John Blue
Soil biological Response to BMPs - Alan Sundermeier, OSU Extension, and Dr. Vinayak Shedekar, USDA-ARS, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Dr. Curtis Young - Attracting And Protecting PollinatorsJohn Blue
Attracting And Protecting Pollinators - Dr. Curtis Young, OSU Extension, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Sarah Noggle - Cover Crop Decision Tool SelectorJohn Blue
Cover Crop Decision Tool Selector - Sarah Noggle, OSU Extension, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Hemp Regulations - Jim Belt, ODA, Head of Hemp for Ohio, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
John Barker - UAVs: Where Are We And What's NextJohn Blue
UAVs: Where Are We And What's Next - John Barker, OSU Extension, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Dr. Rajbir Bajwa - Medical uses of MarijuanaJohn Blue
Medical uses of Marijuana - Dr. Rajbir Bajwa, Coordinator of legal medical marijuana sales, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Dr. Jeff Stachler - Setting up a Corn and Soybean Herbicide Program with Cove...John Blue
Setting up a Corn and Soybean Herbicide Program with Cover Crops - Dr. Jeff Stachler, OSU Extension, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Dr. Chad Penn - Developing A New Approach To Soil Phosphorus Testing And Reco...John Blue
Developing A New Approach To Soil Phosphorus Testing And Recommendations - Dr. Chad Penn, USDA-ARS, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Jim Hoorman - Dealing with Cover Crops after Preventative PlantingJohn Blue
Dealing with Cover Crops after Preventative Planting - Jim Hoorman, Hoorman Soil Health Services, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Dr. Sjoerd Duiker - Dealing with Poor Soil Structure and Soil Compaction John Blue
Dealing with Poor Soil Structure and Soil Compaction - Dr. Sjoerd Duiker, Extension Agronomist, Penn State University, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Christine Brown - Canadian Livestock Producers Efforts to Improve Water QualityJohn Blue
Canadian Livestock Producers Efforts to Improve Water Quality - Christine Brown, Ontario Ministry of Agriculture, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Dr. Lee Briese - Details Matter (includes details about soil, equipment, cove...John Blue
Details Matter (includes details about soil, equipment, cover crops...) - Dr. Lee Briese, North Dakota, 2017 International Crop Adviser of the Year, from the 2020 Conservation Tillage and Technology Conference, held March 3-4, 2020, Ada, OH, USA.
Navigating the world of forex trading can be challenging, especially for beginners. To help you make an informed decision, we have comprehensively compared the best forex brokers in India for 2024. This article, reviewed by Top Forex Brokers Review, will cover featured award winners, the best forex brokers, featured offers, the best copy trading platforms, the best forex brokers for beginners, the best MetaTrader brokers, and recently updated reviews. We will focus on FP Markets, Black Bull, EightCap, IC Markets, and Octa.
Company Valuation webinar series - Tuesday, 4 June 2024FelixPerez547899
This session provided an update as to the latest valuation data in the UK and then delved into a discussion on the upcoming election and the impacts on valuation. We finished, as always with a Q&A
Premium MEAN Stack Development Solutions for Modern BusinessesSynapseIndia
Stay ahead of the curve with our premium MEAN Stack Development Solutions. Our expert developers utilize MongoDB, Express.js, AngularJS, and Node.js to create modern and responsive web applications. Trust us for cutting-edge solutions that drive your business growth and success.
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buy old yahoo accounts buy yahoo accountsSusan Laney
As a business owner, I understand the importance of having a strong online presence and leveraging various digital platforms to reach and engage with your target audience. One often overlooked yet highly valuable asset in this regard is the humble Yahoo account. While many may perceive Yahoo as a relic of the past, the truth is that these accounts still hold immense potential for businesses of all sizes.
At Techbox Square, in Singapore, we're not just creative web designers and developers, we're the driving force behind your brand identity. Contact us today.
Tata Group Dials Taiwan for Its Chipmaking Ambition in Gujarat’s DholeraAvirahi City Dholera
The Tata Group, a titan of Indian industry, is making waves with its advanced talks with Taiwanese chipmakers Powerchip Semiconductor Manufacturing Corporation (PSMC) and UMC Group. The goal? Establishing a cutting-edge semiconductor fabrication unit (fab) in Dholera, Gujarat. This isn’t just any project; it’s a potential game changer for India’s chipmaking aspirations and a boon for investors seeking promising residential projects in dholera sir.
Visit : https://www.avirahi.com/blog/tata-group-dials-taiwan-for-its-chipmaking-ambition-in-gujarats-dholera/
4. How has this changed?
4
0
200,000,000
400,000,000
600,000,000
800,000,000
1,000,000,000
1920 1940 1960 1980 2000 2020
Nitorgen(kg)
Year
Crop Capacity
Available Manure Nutrients
Manure as excreted
8. Switching Gears – What’s Manure Worth
8
• Typical Swine Manure
– 50-35-25 pounds N, P2O5, K2O per 1000 gallons
• Ammonia - $726.14 per ton ($0.44/lb N)
• Potash - $476.75 per ton ($0.40/lb K2O)
• MAP - $605.25 per ton ($0.49/lb P2O5)
• About $49 worth of nutrient value per 1000
gallons
9. 9
• But are we capturing that value?
– Getting it to the right field, at the right amount, at
the right time, and in the right way?
– Minimizing losses of N before and as we apply?
Lot’s of Potential Value
10. How far can we haul?
10
Break-Even
Hauling
Distance
(miles)
Swine Slurry Dairy Slurry Beef Solids Layer
Manure
Turkey Litter
All Nutrients 12 (5-20) 8 (2 -13) 14 (9-20) 25 (16-34) 16 (13-19)
N Only 1 (0-4) 0 (0) 0 (0) 1 (0-3) 2 (1-2)
P & K Only 5 (0 -10) 6 (2-11) 11 (8-13) 21 (13-28) 11 (9-13)
11. What are we seeing
11
• Fewer lagoons, more pits
• Higher N content
– More DDGS in diet
– Lower water wastage
• Lower P content
– More DDGS in diet
– More phytase in diet
• Lower Application Rates
12. Watering System Impact Waste Volume
• Gate-mounted Nipple Drinker (GMND)
• Swinging Nipple Drinker (~ 15% reduction vs. GMND)
• Stainless-steel Bowl (~ 20% reduction vs. GMND)
• Wet-Dry Feeders (~ 30% reduction vs. GMND)
15. Is P Level Getting too low?
15
• Corn-Soybean Rotation
– Want about 150 lbs N to 100 lbs P2O5 (3:2)
• Corn-Corn Rotation
– Want about 200 lbs N to 50 lbs P2O5 (4:1)
• Average Swine Manure
– Have about 50 lbs N to 35 lbs P2O5 (3:2)
• Low P Swine Manure
– Have about 50 lbs N to 15 lbs P2O5 (3:1)
23. Manure Sampling
23
Value of information is the amount of money a decision maker would be willing
to pay for the information prior to making a decision.
29. Manure Application Costs
• Application costs a function of:
– Manure application rate
– Manure transport distance
– Distance Surcharge of $0.01 per kg manure per km transported
29
y = 0.1456x-0.33
R² = 0.9935
y = 0.011x-0.138
R² = 0.9387
0
0.001
0.002
0.003
0.004
0.005
0.006
0 30000 60000 90000 120000
ApplicationCost($/L)
Application Rate (L/ha)
Injection
Broadcast
30. Developed Spreadsheet Tool for Calculations
Tool lets user input:
Animal type (currently swine or dairy)
Number of Animals
Separation efficiency
Nutrient application rates
Model outputs:
Amount of land needed
Estimated manure application costs with and without separation
Tells user price saved in $/L
*Cost to treat has to be less than money saved to be economically feasible
30
31. Example of Output
31
0
0.001
0.002
0.003
0.004
0.005
0 20 40 60 80 100
LandApplicationCost
($/L)
% of Manure Nutrients in Specified Volume
In 1%
In 5%
In 10%
In 20%
Swine finishing operation
4000 head with deep pit storage
Nitrogen limited application
In determining the value of the manure test, it is important to understand how having this information alters the farmer’s nutrient management and affects farm profit.
Input costs: cost estimates of field activities, the cost of purchased inputs (herbicide and seed) the sale price of corn, the cost of synthetic N fertilizer, maximum potential yield, and the response of the corn to the applied N.
N (MRTN) or P (P removal rate) selected
Book N values w/ st dev, A normal probability distribution function was used to assess the percent chance of different nutrient application rates occurring.
Pre or during application
Pre: select rate based on results
During: apply more synthetic N if under applied
Result: producer saves money by ensuring that nutrients are applied at crop needs so yields and therefore profits are maximized.
This graph shows the corn response to Nitrogen. As you can see, the maximum yield is obtained between 150 and 200 kg N/ha for a corn after soybean rotation and at about 250 kg N/ha for a corn after corn rotation. It is important to know the exact N content of the manure because applying above the maximum yield does not increase yield and the excess N has the potential to leach into surface water. If not enough N is applied, even a 5-10% reduction in yield can greatly reduce the producer’s profit.
1000 head swine farm with continuous corn rotation
first four years of manure sample values were 0.84%, 0.72%, 0.98%, and 0.62% N for an average and standard deviation of 0.79% ± 0.16% N. The N content for the current year was 0.92% N.
Without testing: assume available N content of 0.79%
Pre-sampling: test is worth $30.96 ha-1 with overall value of $1,759
Sampling during application: test is worth $14.20 ha-1 with overall value of $1,589.
In both cases, the producer would have under applied N if they had assumed the four year average N content, which would have resulted in reduced corn yields and reduced profits.
Manure sampling is a good return on investment for this case with return of about 9:1
Many factors cause differences in the value of the manure test. The test is especially dependent on the type of manure tested because different manures have different uncertainties in nutrient contents.
Value determined by rotation because corn-corn rotations are more sensitive to N application rate than corn-soybean
Result: pre-sampling more economical when application is N-limited. These results are in $/ha, so a typical farm could potentially save thousands of dollars just by testing their manure.