Long-Term Nitrogen and Phosphorus Fertilization of Irrigated Corn

Authors

A. Schlegel, Kansas State UniversityFollow
H. D. Bond, Kansas State UniversityFollow

Keywords

irrigated corn, nitrogen and phosphorus fertilization, southwest Kansas

Abstract

Long-term research shows that phosphorus (P) and nitrogen (N) fertilizer must be applied to optimize production of irrigated corn in western Kansas. In 2014, N applied alone increased yields 58 bu/a, whereas P applied alone increased yields only 12 bu/a. Nitrogen and P applied together increased yields up to 152 bu/a. This is slightly above the 10-year average, where N and P fertilization increased corn yields up to 146 bu/a. Application of 120 lb/a N (with P) produced about 91% of maximum yield in 2014, which was similar to the 10-year average. Application of 80 instead of 40 lb P2O5/a increased average yields 9 bu/a.

Recommended Citation

Schlegel, A. and Bond, H. D. (2015) "Long-Term Nitrogen and Phosphorus Fertilization of Irrigated Corn," Kansas Agricultural Experiment Station Research Reports: Vol. 1: Iss. 3. https://doi.org/10.4148/2378-5977.1027