Abstract
Assuming that the production increase is proportional to the saturation superdeficit, we get the differential equation:
 
 
 
 where A is the saturation production, and a is the initial production. The equation above has the solution , where is the hyperbolic tangent of . It is possible to generate nomograms based on the equation determined. These nomograms can help prognosticate the agricultural production for the situations in which people choose to use only nitrogen fertilizers
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