The Basis for The Calculator
This calculator was developed based on multiple years of small plot research conducted near Davenport and Pullman, Washington. Small plot research is useful for developing N response curves but cannot account for all the variation in soils and climate within a region. The amount of N required to attain a particular yield goal will vary based on many variables including soil type, location, and year. As such, this calculator should not be used as a guarantee of a particular yield based on a particular rate of N fertilizer, but as a tool to estimate the total N required to achieve a particular yield goal.