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首页> 外文会议>Beltwide Cotton Conference >EARLY LEAF LOSS, LEAF REMOVAL IMPACTS ONUPLAND COTTON GROWTH AND YIELD
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EARLY LEAF LOSS, LEAF REMOVAL IMPACTS ONUPLAND COTTON GROWTH AND YIELD

机译：早期叶片损失，叶片去除影响对棉花生长和产量

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Field studies were initiated in cotton in the San Joaquin Valley of California to evaluate the impact of different amounts of leafloss on growth and yield when the losses were concentrated in the first seven leaves of developing cotton plants. Evaluationswere made over multiple growing seasons in field trials based on two approaches to looking at responses to leaf loss: (1) physicalremoval of specific main stem leaves at certain growth stages using a razor blade; and (2) measured leaf area loss producedusing different rates and timing of insecticide applications to provide partial or more complete control of the thrips. Worm damagein any of the plants during the season was very light, particularly during early season growth, and the presence of thrips wasconfirmed visually and by field sampling. Other insect pests were controlled during the course of the growing season in all plotsaccording to University of CA sampling guidelines, and kept below threshold levels in plots. Leaf removal treatments were 0,29, 43, 57, 71 and 86 percent removal of the first seven main stem leaves on developing plants (with specific patterns and timingof leaf removal). Leaf area loss treatments produced using variable insecticide timing and rates produced leaf area losses rangingfrom 0 to 84 percent leaf area reduction as measured when the 7th leaf reached 25 mm diameter in the 0 percent leaf loss controltreatment. Early season leaf loss up to about 60 percent had no significant impact on lint yields. Leaf loss in the 77 and 86percent treatments resulted in 6 to 16 percent reductions in final plant leaf area (measured in August), moderate delays (3 to 7days) in reaching boll maturity (defined as 60% open bolls) and 9 to 16 percent reductions in yield.
机译：在加利福尼亚州的圣Joaquin谷的棉花中启动了田间研究，以评估不同量的叶片对增长和产量的影响，当损失在发育棉花植物的前七片叶子中浓缩。基于两种观察叶片损失的方法，在实地试验中进行多个生长季节的评价：（1）使用剃刀刀片在某些生长阶段的特定主干叶的物理估算; （2）测量的叶片区域损失造成的杀虫剂应用的不同速率和时序，以提供对蓟马的部分或更完整的控制。蠕虫损伤的季节中的任何植物都非常轻，特别是在初期生长期间，并且蓟马在视觉上并通过现场取样来确认。其他昆虫在所有阴部季节的过程中被控制在加入大学加入采样指南，并在地块中保持低于阈值水平。叶去除处理为0.29,43,57,71和86％去除发育植物上的前七个主干叶（具有特定的图案和叶片去除时）。使用可变杀虫剂时序和速率产生的叶面部损失处理产生的叶面积损失从0％到84％的叶片面积减少时，当第7叶直径为0％的叶片损失控制系统时测量。早期叶片损失高达约60％对棉绒产量没有显着影响。 77和86次治疗中的叶片损失导致最终植物叶面积（8月测量）中减少了6％至16％），适度延迟（3至7天），达到棉铃成熟（定义为60％的开放式铃声）和9％至16％降低产量。

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