Auxin injury on cotton, II: Effects on yield components

IF 2 3区 农林科学 Q2 AGRONOMY
Savana Denton, Tyson Raper, Darrin Dodds, Chris Main, Thomas Mueller
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引用次数: 0

Abstract

Auxin-tolerant cotton (Gossypium hirsutum, L.) cultivars are the latest tools producers use to combat herbicide-resistant weed species during the growing season. The widespread implementation of auxin-tolerant crops has led to an increase in in-season applications of auxins. Auxin drift has subsequently become a more prominent issue in the agricultural industry and causes producers to shift management tactics. Yield partitioning research based on auxin application timing has been conducted, but more information is needed concerning application rate and the interaction between application rate and timing. Experiments were conducted from 2019 to 2021 in Grand Junction, TN, to determine the effects of synthetic auxin exposure on boll positioning, development, and production. Applications of 2,4-dichlorophenoxyacetic acid (2,4-D) or dicamba were made to cotton cultivars of the opposite technology at either matchhead square or 2 weeks after first bloom (FB + 2WK). Nontreated experimental plots were also included. More severe impacts on overall lint yield, yield partitioning, and yield components were observed following exposure to 2,4-D than dicamba. Application rate and timing also impacted yield components and partitioning. Exposure to 2,4-D during vegetative growth caused increased partitioning to vegetative and aborted fruiting positions but decreased partitioning to position 1, zone 2 (nodes 9 through 12), and zone 3 (nodes 13 and above) as application rate increased. Exposure to these rates at FB + 2WK did not impact yield partitioning. Environmental conditions following applications of 2,4-D or dicamba play an important role in the recovery and growth of cotton and subsequent yield penalties.

Abstract Image

棉花生长素损伤ⅱ:对产量成分的影响
耐生长素棉花(棉)品种是生产者在生长季节用来对抗抗除草剂杂草的最新工具。生长素耐受性作物的广泛应用导致生长素的季节性应用增加。生长素漂移随后成为农业中一个更加突出的问题,并导致生产者转变管理策略。基于生长素施药时机的产量分配研究已经开展,但对施药量以及施药量与施药时机的相互作用还需要更多的了解。2019年至2021年,在田纳西州Grand Junction进行了试验,以确定合成生长素暴露对铃定位、发育和生产的影响。2,4-二氯苯氧乙酸(2,4- d)或麦草畏分别施用于不同技术的棉花品种,施用时间为花期后2周(FB + 2WK)。未处理的试验田也包括在内。与麦草畏相比,2,4- d对皮棉总产量、产量分配和产量组成的影响更为严重。施肥量和施肥期对产量构成和分配也有影响。在营养生长期间暴露于2,4- d,导致对营养和败果位置的分配增加,但随着施用量的增加,对位置1、2区(节点9 ~ 12)和3区(节点13及以上)的分配减少。暴露于这些速率在FB + 2WK没有影响产量分配。施用2,4- d或麦草畏后的环境条件对棉花的恢复和生长以及随后的产量影响起重要作用。
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来源期刊
Agronomy Journal
Agronomy Journal 农林科学-农艺学
CiteScore
4.70
自引率
9.50%
发文量
265
审稿时长
4.8 months
期刊介绍: After critical review and approval by the editorial board, AJ publishes articles reporting research findings in soil–plant relationships; crop science; soil science; biometry; crop, soil, pasture, and range management; crop, forage, and pasture production and utilization; turfgrass; agroclimatology; agronomic models; integrated pest management; integrated agricultural systems; and various aspects of entomology, weed science, animal science, plant pathology, and agricultural economics as applied to production agriculture. Notes are published about apparatus, observations, and experimental techniques. Observations usually are limited to studies and reports of unrepeatable phenomena or other unique circumstances. Review and interpretation papers are also published, subject to standard review. Contributions to the Forum section deal with current agronomic issues and questions in brief, thought-provoking form. Such papers are reviewed by the editor in consultation with the editorial board.
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