Author

Andrew Dygert

Advisor

Varco, Jac J.

Committee Member

Cox, Michael S.

Committee Member

Oldham, J. Larry

Committee Member

Irby, Jon Trenton

Committee Member

Hopper, George M.

Date of Degree

8-1-2019

Document Type

Graduate Thesis - Open Access

Major

Agronomy

Degree Name

Master of Science

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

Newer multi-trait soybean varieties have resulted in greater yields, bringing into question whether current soil test K (STK) correlation, calibration, and recommendations need updating to maximize yield. The objective of this study was to refine soil test correlation and calibration using a range in residual STK levels and response in temporal leaf and seed K concentrations and yield across soybean maturity groups IV and V. For the 0- to 15-cm soil depth STK levels greater than 125 mg K kg-1, K did not limit yield. Critical tissue K varied between years and maturity group. Critical K at R1, R3, and R5 for group IV soybean were 13.5, 13.2, and 12.9 g K kg-1, respectively and 12.9, 12.6, and 10.9 g K kg-1 for group V, respectively. Maintaining optimal STK levels can help ensure profitable and sustainable soybean production in Mississippi.

URI

https://hdl.handle.net/11668/14534

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