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- Title
Effect of potassium application rate on cotton growth and yield under irrigated and dryland conditions.
- Authors
Denton, Savana; Dodds, Darrin; Krutz, Jason; Varco, Jac; Gore, Jeff; Raper, Tyson; Cox, Michael; Dhillon, Jagman
- Abstract
Potassium (K) deficiency in cotton (Gossypium hirsutum L.) grown on soils with adequate soil test K levels has become more prevalent. Field experiments were conducted with or without irrigation as the main plot and K fertilizer rates as subplot treatments. Granular K was applied preseason at rates of 0, 45, 90, 134, 179, and 224 kg K ha−1. Two in‐season foliar K programs applied a total of either 2.8 or 5.6 kg K ha−1 were included to compare against the check. Experiments were set up on two distinct soil mapping units (SMUs) in Starkville, MS, including a Leeper silty clay loam (LSCL; fine, smectitic, nonacid, thermic Vertic Epiaquepts) and a Marietta fine sandy loam (MFSL; fine‐loamy, siliceous, active, thermic Fluvaquentic Eutrudepts). Response variables collected include lint yield and fiber quality, leaf K concentrations, and cotton growth and development parameters. Across all years of the experiment, LSCL lint yields increased at a rate of 41 and 118 kg ha−1 per 45 kg K ha−1 under rainfed and irrigated conditions, respectively. On the MFSL, lint yield increase was not significant for either rainfed or irrigated conditions. Leaf K concentrations at first bloom and 4 weeks after first bloom responded quadratically to K rate, with peak leaf K concentrations occurring between 134 and 179 kg K ha−1. Differences in cotton growth parameters were observed; however, differences were likely physiologically insignificant. For all parameters, foliar K application programs did not differ from the untreated check. This investigation showed that foliar K application alone are insufficient, and responses to granular K and irrigation were dependent on SMUs. Core Ideas: Each additional 45 kg K ha−1 applied resulted in lint yield increases ranging from 32 to 118 kg ha−1.A quadratic response of leaf K concentration to K rate occurred with peak concentration occurring at 179 kg K ha−1.Foliar K programs were similar to the untreated for cotton growth, yield, and fiber quality parameters.
- Subjects
MARIETTA (Ga.); COTTON; POTASSIUM; POTASSIUM fertilizers; SOIL mapping; SOIL testing; IRRIGATION
- Publication
Agronomy Journal, 2023, Vol 115, Issue 1, p395
- ISSN
0002-1962
- Publication type
Article
- DOI
10.1002/agj2.21245