不同密度条件下油后直播棉冠层温度对生长发育的影响

A randomized block design of experiments was used to set up six density treatments: 15 000 plants·hm-2,37 500 plants·hm-2, 60 000 plants·hm-2,82 500 plants·hm-2,105 000 plants·hm-2 and 127 500 plants·hm-2.The temperature of the top fourth leaves and canopy of cotton were monitored throughout the day, and the dry matter of cotton organs, seed cotton yield and other agronomic traits were measured regularly to explore the influence of canopy temperature on the growth and development of directly seeded cotton after rape under different densities. The results showed that the canopy temperature of Ganzao 5 increased with the increase of density. Compared with 2021, under high temperature and drought conditions in 2022, Ganzao 5 had more vigorous performoce overall vegetative growth, higher plant height, higher uniformity of cotton boll formation, and higher abscission rate. However, the number of bolls per plant significantly decreased. Therefore, the supplement of soil moisture is one of the important factors determining the normal growth of Ganzao 5. This study quantified the target leaf temperature and canopy temperature through temperature sensors, explored the changes in cotton plant architecture under different densities of planting, and combined with cotton plant pattern surveys. This provides theoretical support for the rational of planting density of directly seeded cotton after rape harvesting in Jiangxi.