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Nitrogen Calculator App for Corn, Spring Wheat/Durum, Sunflower (05/07/20)

Many growers and their consultants have already downloaded and are using the nitrogen calculator app for corn, spring wheat/durum and sunflower, but it is available free for all to use. Go to the Android or Iphone app store and search for North Dakota Crop Nitrogen Calculator and follow the instructions.

Many growers and their consultants have already downloaded and are using the nitrogen calculator app for corn, spring wheat/durum and sunflower, but it is available free for all to use. Go to the Android or Iphone app store and search for North Dakota Crop Nitrogen Calculator and follow the instructions. The calculator was developed as what the Ag Economists call an ‘Economic Production Function’, which means that there is a decreasing rate of yield improvement as N rate increases, and the maximum economic rate of N is based on the N cost, and yield and quality return from using the N rate. In corn, there is no quality consideration. In sunflower, higher N decreases oil, thus net return. In what, higher N increases protein, but in a different manner than the relationship between N and yield. Also, with any of NDSU fertilizer recommendations, the grower/consultant is free to wiggle the final recommendation based on things they know that the recommendation number doesn’t know. These might include protein characteristic of the wheat variety or past performance of the field. The use of the calculator has been validated in field experiments since publication that support the use of the long-term no-till N credit, the soybean N credit, and the general recommendation values on yield results.

 

Dave Franzen

Extension Soil Specialist

701-799-2565

This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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