Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Li, Xiaofei
Committee Member
Harri, Ardian
Committee Member
Mills, Brian
Committee Member
Maples, William
Date of Degree
8-6-2021
Original embargo terms
Complete embargo for 2 years
Document Type
Graduate Thesis - Open Access
Major
Agricultural Economics
Degree Name
Master of Science (M.S.)
College
College of Agriculture and Life Sciences
Department
Department of Agricultural Economics
Abstract
This study estimated soybean yield responses to K fertilizer using trials data from 18 sites in Mississippi from 2011-2016. Eight response functions were fitted, including linear, linear plateau, quadratic, quadratic-plateau, square root quadratic, spherical plateau, exponential, and exponential-plateau functions. The ratio of high responsive, low responsive, and no responsive sites to K rates is 3:3:12 respectively. The response functions led to different predicted optimal K rates, and the best response function for each site was determined by the Vuong closeness test and economic loss analysis. The predicted economically optimal K rates are 157, 73, and 0 lb/acre for high, low, and no response sites respectively, and the average optimal K rate is 55 lb/acre. Compared to the currently used regional uniform K fertilizer rate of 80 lb/acre, the response-based K rates are expected to generate soybean production gain of about $14 per acre for Mississippi soybean producers.
Recommended Citation
Akakpo, Felix, "Estimation of economically optimal potassium rates for soybean production in Mississippi: comparing different yield response functions" (2021). Theses and Dissertations. 5211.
https://scholarsjunction.msstate.edu/td/5211