Abstract
Long-term research shows that phosphorus (P) and nitrogen (N) fertilizer must be applied to optimize production of irrigated grain sorghum in western Kansas. In 2014, N applied alone increased yields 49 bu/a, whereas N and P applied together increased yields up to 81 bu/a. Averaged across the past 10 years, N and P fertilization increased sorghum yields up to 73 bu/a. Application of 40 lb/a N (with P) was sufficient to produce more than 80% of maximum yield in 2014, which almost equals the 10-year average. Application of potassium (K) has had no effect on sorghum yield throughout the study period.
Highlights
Long-term research shows that phosphorus (P) and nitrogen (N) fertilizer must be applied to optimize production of irrigated grain sorghum in western Kansas
Application of 40 lb/a N was sufficient to produce more than 80% of maximum yield in 2014, which almost equals the 10-year average
This study was initiated in 1961 to determine responses of continuous grain sorghum grown under flood irrigation to N, P, and K fertilization
Summary
Part of the Agricultural Science Commons, Agriculture Commons, and the Agronomy and Crop. D. (2015) "Long-Term Nitrogen and Phosphorus Fertilization of Irrigated Grain. Sorghum," Kansas Agricultural Experiment Station Research Reports: Vol 1: Iss. 3. Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Contents of this publication may be freely reproduced for educational purposes. Brand names appearing in this publication are for product identification purposes only. Nor is criticism implied of similar products not mentioned. K-State Research and Extension is an equal opportunity provider and employer
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