植物生长调节剂在棉花上的分区应用降低变异性提高产量

IF 0.7 Q4 AGRICULTURAL ENGINEERING
C. Vaz, J. C. Franchini, E. A. Speranza, R. Inamasu, Lucio A. de C. Jorge, L. M. Rabello, Ivani de O.N. Lopes, Sergio das Chagas, Jefferson L.R. de Souza, M. D. de Souza, Amandio Pires, J. Schepers
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引用次数: 0

摘要

变速率应用在通过空间优化农业投入来减少变异性和提高产量方面具有巨大潜力。在棉花中,植物生长调节剂(PGR)控制过度生长,并为收割作业提供合适的株高。本研究评估了可变速率PGR施用与恒定速率施用相比降低产量空间变异性和提高产量的效果。可变速率方法是在2020年基于区域应用进行的,该应用通过使用土壤电导率、植被指数和产量图的聚类分析来定义。应用剂量和时间是通过整合2019年整个田地和2020年分区的植物高度测量来确定的。为了比较这两种程序,品种和植物种群保持不变;施肥和累积降雨量在两个季节都是相似的。由于分区施用,产量空间变异性降低,产量变异系数(CV)从2019年的18%降至2020年的12%。归一化差异植被指数卫星图像的空间和时间分析显示,2019年(恒定率)的CV值较高,在季末达到30%,而2020年(可变率)的CV值恒定(约10%)。2019年至2020年间,棉花产量从3.5吨/公顷增加到4.3吨/公顷,这在一定程度上可归因于可变利率方法。基于施用区和株高测量的可变比率方法是一种可行的策略,可以减少产量空间变异,并可能在高度可变的棉田中提高产量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Zonal Application of Plant Growth Regulator in Cotton to Reduce Variability and Increase Yield in a Highly Variable Field
Variable-rate application has great potential to reduce variability and increase yield by spatially optimizing agricultural inputs. In cotton, plant growth regulators (PGRs) control excessive growth and provide suitable plant height for harvest operations. This study evaluates the effect of variable-rate PGR application compared to constant-rate application to reduce yield spatial variability and increase yield. The variable-rate approach was carried out in 2020 based on zonal applications defined by clustering analysis using soil electrical conductivity, vegetation indexes, and yield maps. Application doses and timings were determined by integrating plant height measurements for the whole field in 2019 and by zone in 2020. To compare the two procedures, cultivar and plant populations were kept constant; fertilization and accumulated rain were similar in both seasons. A reduction in yield spatial variability due to the zonal application was observed, with yield coefficient of variation (CV) decreasing from 18% in 2019 to 12% in 2020. Spatial and temporal analysis of Normalized Difference Vegetation Index satellite images showed higher CV values in 2019 (constant-rate) reaching 30% at the end of the season, whereas in 2020 (variable-rate) CV was constant (approximately 10%). Cotton yield increased from 3.5 to 4.3 t ha-1 between 2019 and 2020, which can be partially attributed to the variable-rate approach. The variable-rate approach based on application zones and plant height measurements was a viable strategy for reducing yield spatial variability and likely increasing yield in a highly variable cotton field.
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来源期刊
Journal of cotton science
Journal of cotton science AGRICULTURAL ENGINEERING-
CiteScore
0.90
自引率
20.00%
发文量
0
期刊介绍: The multidisciplinary, refereed journal contains articles that improve our understanding of cotton science. Publications may be compilations of original research, syntheses, reviews, or notes on original research or new techniques or equipment.
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