Corn producers looking for a quick and easy way to calculate their nitrogen rate or consider adjustments based on nitrogen and corn costs should use a new slide rule from UNL Extension. "The Corn Nitrogen Rate Slide Rule (EC168)" is free and was produced with financial support from the Nebraska Corn Board. 

"The slide rule will help farmers know how much nitrogen is needed for corn and adjust for economic conditions," according to Charles Shapiro, a UNL extension soils specialist. "It’s important to apply nitrogen properly--the cost of under applying is always a lot higher than over applying."

New Slide Rule Calculates Corn Nitrogen Rates

Designed to fit in a glove box or pocket, the slide rule can be used in the field to calculate nitrogen fertilizer needs in six easy steps. To use it, farmers will need to know the amount of soil organic matter in their fields based on soil tests.

Complete UNL nitrogen recommendations and further information are available in Extension Circular 117, Fertilizer Suggestions for Corn.

Slide rules can be ordered from local Extension offices or by sending a No. 10, self-addressed envelope with $0.79 postage to Charles Shapiro, 57905 866 Rd, UNL Haskell Agricultural Laboratory, Concord, NE 68728-2828.