Article
In-Season Nitrogen Fertilization of Soybean
Iowa State Research Farm Progress Reports
Farm
Armstrong Research and Demonstration Farm
Publication Date
1-1-2001
Disciplines
Abstract
Nitrogen (N) fertilization is not a traditional nutrient management practice for soybean production in Iowa. Soybean is a legume plant and is assumed to adequately obtain needed N through symbiotic fixation. However, there is interest in using N fertilization to increase yield and grain protein due to the recognition of the large N requirement associated with high yields. Despite the fact that soybean is a legume, it readily utilizes soil inorganic N and will do so preferentially to symbiotic N2 fixation. Depending on the residual inorganic N level and soil N mineralization characteristics, approximately 40 to 75% of the N in a mature soybean plant is derived from the soil. Also, soybean seems to require this soil derived N for high yield.
Copyright Owner
Iowa State University
Copyright Date
2001
Language
en
File Format
application/pdf
Citation Information
John E. Sawyer and Daniel W. Barker. "In-Season Nitrogen Fertilization of Soybean" (2001) Available at: http://works.bepress.com/john-sawyer/96/