Theses and Dissertations
Issuing Body
Mississippi State University
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
8-9-2019
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
Recommended Citation
Dygert, Andrew, "Varietal and residual soil test K level effects on soybean leaf K status and yield" (2019). Theses and Dissertations. 4952.
https://scholarsjunction.msstate.edu/td/4952