Date of Award

2017

Publisher

North Dakota State University

Document Type

Thesis

Degree Awarded

Master of Science (MS)

Program

Soil Science

Department

School of Natural Resource Sciences

College

Agriculture, Food Systems, and Natural Resources

Faculty Advisor

Franzen, Dave

Description

Corn (Zea mays L.) production has greatly increased in North Dakota since the 1990s; yet, potassium (K) fertilizer recommendations for corn in North Dakota still date from the late 1970s and early 1980s when corn grain yields were comparatively lower and native soil K fertility was sufficient for most crop K requirements. To update K fertilizer recommendations for modern corn production and lower soil K levels, corn grain yield response to K fertilization, various soil K testing methods, and seasonal soil K variation were investigated in a two-year (2015 and 2016) study. The standard soil K testing method of NH4OAC extraction on dried soil remained the best predictor of yield response, although corn on some soils did not respond in accordance with soil test K level. Soil test K was highest in spring and lowest in late summer, indicating that soil test K interpretation should account for seasonal variation.

Rights

NDSU policy 190.6.2

Rights Link

https://www.ndsu.edu/fileadmin/policy/190.pdf

Handle Identifier

https://hdl.handle.net/10365/28659

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