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.
Keywords: irrigated grain sorghum, nitrogen and phosphorus fertilization, southwest Kansas
How to Cite:
Schlegel, A. & Bond, H. D., (2015) “Long-Term Nitrogen and Phosphorus Fertilization of Irrigated Grain Sorghum”, Kansas Agricultural Experiment Station Research Reports 1(3). doi: https://doi.org/10.4148/2378-5977.1028
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