Varco, Jac J.
Cox, Michael S.
Oldham, J. Larry
Irby, Jon Trenton
Hopper, George M.
Date of Degree
Graduate Thesis - Open Access
Master of Science
College of Agriculture and Life Sciences
Department of Plant and Soil Sciences
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.
Dygert, Andrew, "Varietal and residual soil test K level effects on soybean leaf K status and yield" (2019). Theses and Dissertations MSU. 4952.