The NPK (Nitrogen, Phosphorus, Potassium) Recommendations Calculator uses soil type, crop code and soil test levels for phosphorus and potassium to provide Clemson recommendations for fertilizer ...

At the closing of each growing season, growers start thinking about the next year, and soil testing is an important part of that planning. The Montana State University Extension Soil Fertility Program ...

The Iowa Legislature wants to spend $1 million next year to revise the state’s long-standing nitrogen fertilizer calculator used in seven corn-growing states. The money would be used to update the ...