Applied Fertility Management for Irrigated Soybean Production

IPNI-2011-USA-KS41

Expected Outcome: It is expected that P, K, and N fertilizer application will have a significant positive effect on soybean yield, as demonstrated by Lamond and Wesley (2001) and Gordon (2008). Yield response to S is currently unknown. However, given the recent increase in crop S deficiency across the United States attributed to more stringent air quality regulations and reduced atmospheric S deposition, a positive yield response to S fertilization is possible. Read more


Year of initiation:2011
Year of completion:2012
Map:

Interpretive Summary

Past research from Kansas State University's (KSU) North Central Kansas Experimental Field near Scandia has demonstrated that more intensive fertility management, including direct application of P and K, has the potential to significantly improve irrigated soybean yield. Despite these findings, soybean producers have been slow to adopt more intensive fertility management programs.

Although irrigated soybean yields in North Central Kansas have trended upward in recent years, producers in the area are largely unsatisfied with yield performance. Past research from the Kansas State University (KSU) North Central Kansas Experiment Field near Scandia demonstrated that more intensive fertility management, including direct application of P and K, has the potential to significantly improve irrigated soybean yield.

Irrigated soybean yields in North Central Kansas averaged about 53 bu/A over a recent 10-year period from 2000 to 2009. Although yields have trended upward, producers in the area are largely unsatisfied. Past research conducted at the Kansas State University North Central Kansas Experiment Field near Scandia has demonstrated that proper fertility management, including direct application of P and K, has the potential to significantly improve irrigated soybean yield.

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Updates & Reports

2011

References

2011

Project Description


Project Leader

J. Randall Nelson, Kansas State University


Project Cooperators

None


IPNI Staff

Mike Stewart


Location

Americas \ Northern America \ USA \ Kansas


Topics

4r rate, soil fertility and productivity, yield

soybean

Phosphorus (P), Potassium (K)