{"id":13302,"date":"2022-07-25T14:45:32","date_gmt":"2022-07-25T18:45:32","guid":{"rendered":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences-new\/?p=13302"},"modified":"2022-07-28T09:26:11","modified_gmt":"2022-07-28T13:26:11","slug":"when-crops-eat-first","status":"publish","type":"post","link":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/news\/when-crops-eat-first\/","title":{"rendered":"When Crops Eat First: Enhanced Efficiency Fertilizers for Improved Nitrogen Management"},"content":{"rendered":"

Synthetic nitrogen fertilizers have become so costly to farmers, the energy sector and the environment that everyone seems open to alternatives. But in today\u2019s high production systems, driving profitable crop yield demands specific plant nitrogen levels. Farmers increasingly face the double dilemma of stomaching high fertilizer costs and the potentially high environmental impact of their use.\u00a0<\/span><\/p>\n

New research from North Carolina State University\u2019s Department of Crop and Soil Sciences will investigate whether or not enhanced efficiency fertilizers (EEFs) could benefit both farm profitability <\/span>and<\/span><\/i> the environment.<\/span><\/p>\n

Nitrogen Everywhere But Here<\/span><\/h2>\n

Nitrogen is an essential nutrient for plant growth. In a sustainable cycle, nature employs multitudes of soil bacteria to convert the abundant atmospheric nitrogen into plant-usable forms.\u00a0<\/span><\/p>\n

But when the system is overloaded from high nitrogen rates or poor application conditions, environmentally-damaging ammonia and nitrous oxide gasses can be released from the soil in high amounts. A farmer\u2019s pricey nitrogen investment can literally disappear into thin air.<\/span><\/p>\n

\"Nitrogen
The Nitrogen Cycle. Image courtesy of Jayson Benge on Researchgate.net<\/em><\/figcaption><\/figure>\n

Urease and Nitrification Inhibitors Improve Nutrient Use Efficiency<\/span><\/h2>\n

NC State assistant professor Alex Woodley is leading a new study funded by a USDA-NRCS Conservation Innovation Grant to evaluate the effect of dual urease and nitrification inhibitor-spiked fertilizer to mitigate nitrous oxide and ammonia emissions — and to potentially reduce nitrogen inputs.<\/span><\/p>\n

\u201cTraditional nitrogen application rate recommendations are crop-response driven. Typically, at 150-250lbs of nitrogen per acre, we see the most economic benefit in corn. But we don\u2019t account for nutrient losses due to soil cycling, which is both financially and environmentally troubling,\u201d Woodley said. \u201cUsing EEFs can help reduce these losses.\u201d\u00a0<\/span><\/p>\n

Woodley\u2019s group plans to test nitrification inhibitors mixed with the most commonly used forms of agricultural nitrogen (UAN and urea) to create an EEF. Inhibitors work by slowing or halting the natural nitrogen cycling process, ideally keeping the nitrogen in the ammonium form and giving plants first dibs (and more time) to uptake the valuable nutrient.\u00a0<\/span><\/p>\n

\"NItrogen
NC nitrogen yield curve.<\/em><\/figcaption><\/figure>\n

Historically, nitrogen application rates have losses factored in, but EEFs could significantly increase a crop\u2019s nutrient use efficiency with nitrogen.<\/span><\/p>\n

\u201cThe nitrogen cycle is a leaky bucket,\u201d Woodley said. \u201cSoil nitrogen is hard to retain. Up to 50% of applied nitrogen can be lost in soil cycling through a combination of volatilization, leaching or nitrous oxide emissions. So, as little as half of what a farmer paid for (and crops need) may actually be going to its intended use.\u201d<\/span><\/p>\n

Moving Nitrogen From Risk to Reward<\/span><\/h2>\n

Woodley\u2019s three-year study will compare EEFs at various nitrogen application rates compared to untreated regular UAN fertilizer across six corn plots per year on private farms in eastern NC.<\/span><\/p>\n

The group will use soil emission-monitoring chambers to measure gas release and multispectral drone imagery to assess field variables that accelerate nitrogen losses.<\/span><\/p>\n

\"Automated<\/p>\n

Fixed soil-monitoring chambers (front) will collect emissions study data in the field. Automated chambers (back) are used in CASM research.\u00a0<\/span><\/i><\/p>\n

Previous research on these types of EEFs has shown a mixed impact on crop yield. Warm, rainy seasons, sudden rain events or windy, hot conditions after nitrogen application cause nitrogen to leave the system and crop yields to suffer. But in ideal weather and application scenarios, farmers often don\u2019t see any yield increase from EEFs.\u00a0<\/span><\/p>\n

On the surface, EEFs appear to merely offer farmers a nitrogen-availability insurance policy — at an added cost.\u00a0<\/span><\/p>\n

\u201cWe talk about hot spots and hot moments for gaseous soil emissions. The season\u2019s weather, application conditions and micro-climates in a field can dramatically impact off-gassing — from virtually none in cool, still conditions up to 50% in hot, windy scenarios,\u201d Woodley said. \u201cEEFs used to be viewed as an expensive risk-mitigation tool, particularly for urea-based fertilizers.\u201d\u00a0<\/span><\/p>\n

With nitrogen input costs skyrocketing (up 100% in some areas) and availability unstable, the insurance potential alone might appeal to growers. But if nitrification inhibitors can fend off bacterial nitrogen processing and preserve its availability for plants, couldn\u2019t a farmer get away with applying less fertilizer overall?\u00a0<\/span><\/p>\n

Woodley says, \u201cBingo.\u201d<\/span><\/p>\n

\u201cWe think we could potentially reduce nitrogen rates 15-20% for a substantial environmental benefit with no negative impact on yield,\u201d Woodley said. \u201cAnd because inhibitors are only soil active for two to three weeks before breaking down, they are relatively low risk. Unlike excess nutrients, at the end of the season, you never know they were there.\u201d\u00a0\u00a0<\/span><\/p>\n

Because Woodley\u2019s research will capture field variability and emissions, future EEF recommendations could even be tailored for variable rate application or spot use in problem zones like low areas <\/span>and wet spots.<\/span><\/p>\n

\"UAV
UAV map comparison of crop establishment and predicted ponding areas for potential N2O release. Images by Brynna Bruxellas and Rob Austin.<\/figcaption><\/figure>\n

Importance in NC\u2019s Coastal Plain<\/span><\/h2>\n

Nitrogen fertilizers are a well-known contributor to troubling <\/span>nitrous oxide emissions<\/span><\/a>. However, ammonia emissions are less often accounted for, but are also risky, especially to aquatic ecosystems.<\/span><\/p>\n

Because NC\u2019s prime agricultural land lies in the coastal plain, our rivers and coastal estuaries are especially vulnerable. Nitrogen leaching and ammonia production over-stimulate microorganisms, producing harmful algae blooms and reducing water-dissolved oxygen levels for aquatic life.\u00a0<\/span><\/p>\n

Ammonia deposited into waterways and other off-site areas can also turn into nitrous oxide and release away from the farm.<\/span><\/p>\n

\"Algae
Nitrogen-induced algae blooms disrupt aquatic life.<\/figcaption><\/figure>\n

\u201cNitrous oxide is a hot topic right now because of the government\u2019s interest in climate mitigation. But because of ammonia\u2019s water and air quality risks, we think it will become increasingly important in EPA monitoring and potentially conservation incentives,\u201d Woodley said. \u201cIt\u2019s already become a management priority in Europe.\u201d<\/span><\/p>\n

Most research on EEFs has been conducted in the organically-rich soils of the Midwest. Eastern NC\u2019s coarse-textured soils and hot, humid conditions pose different challenges and risk-reward opportunities.<\/span><\/p>\n

Controlling the pace of nitrogen cycling, and potentially the amount of nitrogen applied, would be an environmental win on both accounts.<\/span><\/p>\n

\u201cWe\u2019ve seen amazing results from inhibitors in other areas of North America in ammonia volatilization reduction,\u201d Woodley said. \u201cBut we need to closely examine how inhibitors will function in the hot, humid conditions and coarse soils of eastern NC. There could be even more benefits here, as these are the conditions for high ammonia losses.\u201d\u00a0<\/span><\/p>\n

\"\"<\/p>\n

Farm Revenue Beyond Yield<\/span><\/h2>\n

If nutrient use efficiency and environmental benefit weren\u2019t enough incentives to inspire EEF adoption, the emerging carbon market might offer even more.\u00a0<\/span><\/p>\n

NC\u2019s sandy coastal soils are notoriously difficult for <\/span>carbon sequestration<\/span><\/a>, leaving these growers at a carbon-revenue disadvantage compared to their Midwestern counterparts.\u00a0<\/span><\/p>\n

However, pilot projects are popping up throughout the U.S. that incentivize farmers to adopt EEFs in their system. For example, Bayer, in collaboration with CHS Farmers Alliance, is paying farmers $3 per acre to use EEFS.\u00a0<\/span><\/p>\n

\u201cIrrigation and nitrogen fertilizers are often the two most energy-intensive processes on a farm,\u201d Woodley said. \u201cImproving nitrogen use efficiency and reducing nitrogen inputs with EEFs could significantly lower the global energy footprint of agriculture and potentially open a new revenue stream for NC farmers.\u201d<\/span><\/p>\n

Woodley\u2019s EEF study is an added layer on <\/span>Climate Adaptation through Agriculture and Soil Management<\/span><\/a>\u2019s (CASM) private donor-funded greenhouse gas research and is a part of the N.C. Plant Sciences Initative<\/a>.<\/span><\/p>\n

Want More Innovation?<\/span><\/h2>\n

Crop and Soil Sciences’ research impacts farmers, students, and NC citizens. Follow how our discoveries affect agriculture and environmental science by joining our <\/span>weekly newsfeed<\/span><\/a>.<\/span><\/p>\n

If you are a student interested in climate mitigation, nutrient management, or soil science, investigate our undergraduate and graduate <\/span>degree programs<\/span><\/a>, including a deep dive with our <\/span>soil degree ebook<\/span><\/a>. Then join us for a <\/span>guided email tour<\/span><\/a> of our department and university.\u00a0\u00a0<\/span><\/p>\n

Protecting NC\u2019s agriculture and environment through stewardship is just part of how we are growing the future.<\/span><\/p>\n

\"NC State<\/p>\n","protected":false,"raw":"Synthetic nitrogen fertilizers have become so costly to farmers, the energy sector and the environment that everyone seems open to alternatives. But in today\u2019s high production systems, driving profitable crop yield demands specific plant nitrogen levels. Farmers increasingly face the double dilemma of stomaching high fertilizer costs and the potentially high environmental impact of their use.\u00a0<\/span>\r\n\r\nNew research from North Carolina State University\u2019s Department of Crop and Soil Sciences will investigate whether or not enhanced efficiency fertilizers (EEFs) could benefit both farm profitability <\/span>and<\/span><\/i> the environment.<\/span>\r\n

Nitrogen Everywhere But Here<\/span><\/h2>\r\nNitrogen is an essential nutrient for plant growth. In a sustainable cycle, nature employs multitudes of soil bacteria to convert the abundant atmospheric nitrogen into plant-usable forms.\u00a0<\/span>\r\n\r\nBut when the system is overloaded from high nitrogen rates or poor application conditions, environmentally-damaging ammonia and nitrous oxide gasses can be released from the soil in high amounts. A farmer\u2019s pricey nitrogen investment can literally disappear into thin air.<\/span>\r\n\r\n[caption id=\"attachment_13310\" align=\"alignnone\" width=\"850\"]\"Nitrogen The Nitrogen Cycle. Image courtesy of Jayson Benge on Researchgate.net<\/em>[\/caption]\r\n

Urease and Nitrification Inhibitors Improve Nutrient Use Efficiency<\/span><\/h2>\r\nNC State assistant professor Alex Woodley is leading a new study funded by a USDA-NRCS Conservation Innovation Grant to evaluate the effect of dual urease and nitrification inhibitor-spiked fertilizer to mitigate nitrous oxide and ammonia emissions -- and to potentially reduce nitrogen inputs.<\/span>\r\n\r\n\u201cTraditional nitrogen application rate recommendations are crop-response driven. Typically, at 150-250lbs of nitrogen per acre, we see the most economic benefit in corn. But we don\u2019t account for nutrient losses due to soil cycling, which is both financially and environmentally troubling,\u201d Woodley said. \u201cUsing EEFs can help reduce these losses.\u201d\u00a0<\/span>\r\n\r\nWoodley\u2019s group plans to test nitrification inhibitors mixed with the most commonly used forms of agricultural nitrogen (UAN and urea) to create an EEF. Inhibitors work by slowing or halting the natural nitrogen cycling process, ideally keeping the nitrogen in the ammonium form and giving plants first dibs (and more time) to uptake the valuable nutrient.\u00a0<\/span>\r\n\r\n[caption id=\"attachment_13383\" align=\"alignright\" width=\"557\"]\"NItrogen NC nitrogen yield curve.<\/em>[\/caption]\r\n\r\nHistorically, nitrogen application rates have losses factored in, but EEFs could significantly increase a crop\u2019s nutrient use efficiency with nitrogen.<\/span>\r\n\r\n\u201cThe nitrogen cycle is a leaky bucket,\u201d Woodley said. \u201cSoil nitrogen is hard to retain. Up to 50% of applied nitrogen can be lost in soil cycling through a combination of volatilization, leaching or nitrous oxide emissions. So, as little as half of what a farmer paid for (and crops need) may actually be going to its intended use.\u201d<\/span>\r\n

Moving Nitrogen From Risk to Reward<\/span><\/h2>\r\nWoodley\u2019s three-year study will compare EEFs at various nitrogen application rates compared to untreated regular UAN fertilizer across six corn plots per year on private farms in eastern NC.<\/span>\r\n\r\nThe group will use soil emission-monitoring chambers to measure gas release and multispectral drone imagery to assess field variables that accelerate nitrogen losses.<\/span>\r\n\r\n\"Automated\r\n\r\nFixed soil-monitoring chambers (front) will collect emissions study data in the field. Automated chambers (back) are used in CASM research.\u00a0<\/span><\/i>\r\n\r\nPrevious research on these types of EEFs has shown a mixed impact on crop yield. Warm, rainy seasons, sudden rain events or windy, hot conditions after nitrogen application cause nitrogen to leave the system and crop yields to suffer. But in ideal weather and application scenarios, farmers often don\u2019t see any yield increase from EEFs.\u00a0<\/span>\r\n\r\nOn the surface, EEFs appear to merely offer farmers a nitrogen-availability insurance policy -- at an added cost.\u00a0<\/span>\r\n\r\n\u201cWe talk about hot spots and hot moments for gaseous soil emissions. The season\u2019s weather, application conditions and micro-climates in a field can dramatically impact off-gassing -- from virtually none in cool, still conditions up to 50% in hot, windy scenarios,\u201d Woodley said. \u201cEEFs used to be viewed as an expensive risk-mitigation tool, particularly for urea-based fertilizers.\u201d\u00a0<\/span>\r\n\r\nWith nitrogen input costs skyrocketing (up 100% in some areas) and availability unstable, the insurance potential alone might appeal to growers. But if nitrification inhibitors can fend off bacterial nitrogen processing and preserve its availability for plants, couldn\u2019t a farmer get away with applying less fertilizer overall?\u00a0<\/span>\r\n\r\nWoodley says, \u201cBingo.\u201d<\/span>\r\n\r\n\u201cWe think we could potentially reduce nitrogen rates 15-20% for a substantial environmental benefit with no negative impact on yield,\u201d Woodley said. \u201cAnd because inhibitors are only soil active for two to three weeks before breaking down, they are relatively low risk. Unlike excess nutrients, at the end of the season, you never know they were there.\u201d\u00a0\u00a0<\/span>\r\n\r\nBecause Woodley\u2019s research will capture field variability and emissions, future EEF recommendations could even be tailored for variable rate application or spot use in problem zones like low areas <\/span>and wet spots.<\/span>\r\n\r\n[caption id=\"attachment_13354\" align=\"alignnone\" width=\"1500\"]\"UAV UAV map comparison of crop establishment and predicted ponding areas for potential N2O release. Images by Brynna Bruxellas and Rob Austin.[\/caption]\r\n

Importance in NC\u2019s Coastal Plain<\/span><\/h2>\r\nNitrogen fertilizers are a well-known contributor to troubling <\/span>nitrous oxide emissions<\/span><\/a>. However, ammonia emissions are less often accounted for, but are also risky, especially to aquatic ecosystems.<\/span>\r\n\r\nBecause NC\u2019s prime agricultural land lies in the coastal plain, our rivers and coastal estuaries are especially vulnerable. Nitrogen leaching and ammonia production over-stimulate microorganisms, producing harmful algae blooms and reducing water-dissolved oxygen levels for aquatic life.\u00a0<\/span>\r\n\r\nAmmonia deposited into waterways and other off-site areas can also turn into nitrous oxide and release away from the farm.<\/span>\r\n\r\n[caption id=\"attachment_13305\" align=\"alignnone\" width=\"1500\"]\"Algae Nitrogen-induced algae blooms disrupt aquatic life.[\/caption]\r\n\r\n\u201cNitrous oxide is a hot topic right now because of the government\u2019s interest in climate mitigation. But because of ammonia\u2019s water and air quality risks, we think it will become increasingly important in EPA monitoring and potentially conservation incentives,\u201d Woodley said. \u201cIt\u2019s already become a management priority in Europe.\u201d<\/span>\r\n\r\nMost research on EEFs has been conducted in the organically-rich soils of the Midwest. Eastern NC\u2019s coarse-textured soils and hot, humid conditions pose different challenges and risk-reward opportunities.<\/span>\r\n\r\nControlling the pace of nitrogen cycling, and potentially the amount of nitrogen applied, would be an environmental win on both accounts.<\/span>\r\n\r\n\u201cWe\u2019ve seen amazing results from inhibitors in other areas of North America in ammonia volatilization reduction,\u201d Woodley said. \u201cBut we need to closely examine how inhibitors will function in the hot, humid conditions and coarse soils of eastern NC. There could be even more benefits here, as these are the conditions for high ammonia losses.\u201d\u00a0<\/span>\r\n\r\n\"\"\r\n

Farm Revenue Beyond Yield<\/span><\/h2>\r\nIf nutrient use efficiency and environmental benefit weren\u2019t enough incentives to inspire EEF adoption, the emerging carbon market might offer even more.\u00a0<\/span>\r\n\r\nNC\u2019s sandy coastal soils are notoriously difficult for <\/span>carbon sequestration<\/span><\/a>, leaving these growers at a carbon-revenue disadvantage compared to their Midwestern counterparts.\u00a0<\/span>\r\n\r\nHowever, pilot projects are popping up throughout the U.S. that incentivize farmers to adopt EEFs in their system. For example, Bayer, in collaboration with CHS Farmers Alliance, is paying farmers $3 per acre to use EEFS.\u00a0<\/span>\r\n\r\n\u201cIrrigation and nitrogen fertilizers are often the two most energy-intensive processes on a farm,\u201d Woodley said. \u201cImproving nitrogen use efficiency and reducing nitrogen inputs with EEFs could significantly lower the global energy footprint of agriculture and potentially open a new revenue stream for NC farmers.\u201d<\/span>\r\n\r\nWoodley\u2019s EEF study is an added layer on <\/span>Climate Adaptation through Agriculture and Soil Management<\/span><\/a>\u2019s (CASM) private donor-funded greenhouse gas research and is a part of the N.C. Plant Sciences Initative<\/a>.<\/span>\r\n

Want More Innovation?<\/span><\/h2>\r\nCrop and Soil Sciences' research impacts farmers, students, and NC citizens. Follow how our discoveries affect agriculture and environmental science by joining our <\/span>weekly newsfeed<\/span><\/a>.<\/span>\r\n\r\nIf you are a student interested in climate mitigation, nutrient management, or soil science, investigate our undergraduate and graduate <\/span>degree programs<\/span><\/a>, including a deep dive with our <\/span>soil degree ebook<\/span><\/a>. Then join us for a <\/span>guided email tour<\/span><\/a> of our department and university.\u00a0\u00a0<\/span>\r\n\r\nProtecting NC\u2019s agriculture and environment through stewardship is just part of how we are growing the future.<\/span>\r\n\r\n\"NC"},"excerpt":{"rendered":"

NC State researchers investigate if enhanced efficiency fertilizers (EEFs) could benefit both farm profitability and the environment.<\/p>\n","protected":false},"author":2196,"featured_media":13303,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"source":"","ncst_custom_author":"","ncst_show_custom_author":false,"ncst_dynamicHeaderBlockName":"","ncst_dynamicHeaderData":"","ncst_content_audit_freq":"","ncst_content_audit_date":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[23],"tags":[472,300,433,245,431],"class_list":["post-13302","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research","tag-casm","tag-fertilizer","tag-nitrous-oxide","tag-soil-research","tag-sustainability"],"displayCategory":null,"acf":[],"_links":{"self":[{"href":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/wp-json\/wp\/v2\/posts\/13302","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/wp-json\/wp\/v2\/users\/2196"}],"replies":[{"embeddable":true,"href":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/wp-json\/wp\/v2\/comments?post=13302"}],"version-history":[{"count":5,"href":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/wp-json\/wp\/v2\/posts\/13302\/revisions"}],"predecessor-version":[{"id":13398,"href":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/wp-json\/wp\/v2\/posts\/13302\/revisions\/13398"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/wp-json\/wp\/v2\/media\/13303"}],"wp:attachment":[{"href":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/wp-json\/wp\/v2\/media?parent=13302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/wp-json\/wp\/v2\/categories?post=13302"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cals.ncsu.edu\/crop-and-soil-sciences\/wp-json\/wp\/v2\/tags?post=13302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}