Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Bond, Jason A.
Committee Member
Golden, Bobby R.
Committee Member
Allen, Tom W.
Committee Member
Carey, Victor F.
Committee Member
Dodds, Darrin M.
Date of Degree
8-9-2022
Document Type
Graduate Thesis - Open Access
Major
Agronomy
Degree Name
Master of Science (M.S.)
College
College of Agriculture and Life Sciences
Department
Department of Plant and Soil Sciences
Abstract
Optimal plant populations are critical in achieving high rice yields. The purpose of this research was to investigate yield penalties associated with inadequate, non-uniform plant populations for modern rice cultivars. Research was conducted at the Delta Research and Extension Center in Stoneville, MS, in 2019, 2020 and 2021. In one study, inbred, herbicide-resistant ‘CL153’ was drill-seeded at 73-18 kg ha-1 after being mixed with inbred, herbicide-susceptible ‘Rex’ at 0-55 kg ha-1. Likewise, hybrid, herbicide-resistant cultivar ‘CL XL7521’ was seeded at 29-8 kg ha-1 mixed with hybrid, herbicide-susceptible ‘XP753’ at 0-21 kg ha-1. At the two- to three- leaf growth stage, imazamox was applied to eliminate ‘Rex’ and ‘XP753’ in their respective studies to achieve the target plant population (TPP). Results indicate that when plant populations are reduced up to 30% in both inbred and hybrid cultivars, grain yields should be comparable if not greater than an adequate, uniform plant population.
Recommended Citation
Eubank, Thomas William IV, "Assessing non-uniform inbred and hybrid rice (Oryza sativa) population for replant decisions" (2022). Theses and Dissertations. 5563.
https://scholarsjunction.msstate.edu/td/5563