Cotton yield and lint quality responses to nitrogen rate and placement in the humid southeast

Abstract

Proper N management in upland cotton (Gossypium hirsutum L.) is essential to optimize yields. Information on proper N application rate and placement method is needed for coarse-textured soils of the humid Southeast. The objective of this study was to measure strip-tilled cotton performance in response to five N rate and placement application methods. Five N rates (0, 45, 90, 135, and 180 kg N ha −1) and three placement methods {broadcast (urea + ammonium sulfate [AMS], surface banded (urea ammonium nitrate [UAN] + ammonium thiosulfate [ATS]), and injected (UAN + ATS) were evaluated from 2016 to 2018 at five sites in Virginia and one site in North Carolina. Petiole NO 3-N, lint yield, lint percent turnout, and fiber quality parameters were measured. Nitrogen rate and placement had a significant effect on lint yield but only N rate affected petiole NO 3-N concentration. Quadratic plateau analysis of relative yield found that 133, 128, and 180 kg N ha −1 were the optimum N rates for injected, surface-banded, and broadcast systems with relative yields of 95, 90, and 94%, respectively. A critical petiole NO 3-N concentration threshold of 5600 mg NO 3-N kg −1 at early bloom was calculated to reach 92% relative yield. Neither rate nor placement had an effect on fiber quality parameters. This study shows that both surface banding and injecting between 128 and 133 kg N ha −1 can produce 90% or more relative yield for a modern cotton variety in the upper southeastern coastal plain of the United States.

Delayed harvest time affects strength and color parameters in cotton fibers

“…Altogether, this is the first study reporting lint quality parameters of Argentine cultivars, being similar to those reported in the main cotton-producing countries in terms of length, strength, uniformity, color, and micronaire (Abdelraheem et al, 2020;Ballester et al, 2021;Gao et al, 2020;McClanahan et al, 2020;Zeng et al, 2021). Results from our experiments have confirmed significant differences on LY and quality that depended on the cultivar, environment, or HT.…”

Comparative Effect of Different Mineral Nitrogen Fertilizer Sources on Productivity and Quality of Some Egyptian Cotton Cultivars

“…Khan, et al, (2017b) stated that nitrogen (N) is very important nutrient that play essential parts in enhancing photosynthesis and yield of lint in cotton, thus application of N fertilizer is an essential component of any successful integrated cotton production system. Increasing nitrogen efficiency through use best nitrogen sources is one of the most factors that limit productivity of cotton (McClanahan, et al, 2020). Nitrogen fertilizers commonly supply in amide, ammonium or nitrate forms.…”