Yield and yield-driving physiological traits under different nitrogen rates and mepiquat chloride strategies in cotton

IF 2.4 3区农林科学 Q2 AGRONOMY

Crop Science Pub Date : 2026-07-23 DOI:10.1002/csc2.70344

Ashbin Kumar Bhat, John Snider, Simerjeet Virk, Lavesta C. Hand, Ved Parkash, Joshua Mark Lee, Ingrid Brito Almeida, Jhansy Reddy Katta, Comfort Adegbenro, Mohit Kumar, Emmanuella Bredu, Brian Jayson Wisekal

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引用次数: 0

Abstract

The interactive effects of nitrogen (N) and mepiquat chloride (MC) on yield and key physiological traits have received limited attention in the primary literature. This study was aimed to (1) evaluate the effects of N rate and MC application strategy on yield-altering physiological processes, lint yield, and fiber quality and (2) quantify relationships between lint yield and physiological responses at peak bloom and cutout stages. A field experiment was conducted in 2023 and 2024 near Tifton, GA, using a split-plot design with three N rates (0, 135, and 270 kg N ha⁻¹) and three MC strategies (control, moderate, and aggressive). Variables assessed included lint yield, gin turnout, fiber quality traits, fraction of intercepted photosynthetically active radiation (IPAR_f), radiation use efficiency, above-ground biomass (AGB), N uptake, and crop growth rate. Nitrogen fertilization increased lint yield (57-91%), IPAR_f, AGB, and N uptake, with no yield benefit above 135 kg N ha⁻¹. Yield increased by 18%–25% with MC application in 2024, but no impact was observed in 2023. No significant N × MC interaction was observed for yield. Regression analysis showed that IPAR_f and AGB at peak bloom were the most consistent predictors of lint yield. Nitrogen and MC effects on fiber quality varied by year. Nitrogen application had a consistent positive effect on yield and physiological traits. MC showed variable effects on lint yield across years. IPAR_f and AGB and N uptake at the peak bloom are important indicators of N- or MC-management-driven yield variation in cotton.

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不同施氮量和氯吡草枯策略下棉花产量及产量驱动生理性状

氮(N)和氯甲草枯（MC）对产量和关键生理性状的交互作用在原始文献中受到的关注有限。本研究旨在(1)评估施氮量和施用有机肥策略对产量变化生理过程、皮棉产量和纤维品质的影响；(2)量化皮棉产量与高峰开花和扦插期生理反应之间的关系。2023年和2024年在乔治亚州蒂夫顿附近进行了一项田间试验，采用三种氮肥水平（0、135和270 kg N ha - 1）和三种MC策略（控制、适度和积极）的分块设计。评估的变量包括皮棉产量、轧棉率、纤维品质性状、截获光合有效辐射（IPAR f）比例、辐射利用效率、地上生物量（AGB）、氮吸收和作物生长率。施氮可提高皮棉产量（57 ~ 91%）、IPAR f、AGB和氮素吸收量，但在135 kg N ha−1以上没有产量效益。2024年施用MC增产18%-25%，但2023年未见影响。在产量方面未观察到显著的N与MC相互作用。回归分析表明，峰花期IPAR f和AGB是预测皮棉产量最一致的指标。氮素和纤维素对纤维品质的影响因年份而异。施氮对产量和生理性状有一致的正向影响。不同年份对棉棉产量的影响是不同的。IPAR f和AGB以及盛花期氮素吸收是反映棉花氮素或MC管理驱动产量变化的重要指标。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Crop Science 农林科学-农艺学

CiteScore

4.50

自引率

8.70%

发文量

197

审稿时长

3 months

期刊介绍： Articles in Crop Science are of interest to researchers, policy makers, educators, and practitioners. The scope of articles in Crop Science includes crop breeding and genetics; crop physiology and metabolism; crop ecology, production, and management; seed physiology, production, and technology; turfgrass science; forage and grazing land ecology and management; genomics, molecular genetics, and biotechnology; germplasm collections and their use; and biomedical, health beneficial, and nutritionally enhanced plants. Crop Science publishes thematic collections of articles across its scope and includes topical Review and Interpretation, and Perspectives articles.