植物有机体的生长依赖于光合作用,环境条件适宜,可以发挥光合作用的最大效率,而经济产量的形成随叶面积和生物学产量的变化而变化。本文根据我们1981年对我省棉花主要品种沪棉204进行的分期播种试验资料,着重对棉花叶面积变化与干物重的关系及其对经济产量的影响以及环境条件(主要是光、温、水)所起的作用分析如下:一、干物重与叶面积变化的关系棉花自盛花以后单株干物重急速增长。在小满前后播种的(5月20日前后),有40～50天的迅速增长期,大致可以延至8月底 The growth of plant organisms depends on photosynthesis, suitable environmental conditions, can play the maximum efficiency of photosynthesis, and economic yield formation with leaf area and biological yield changes. According to our 1981 seeding cotton planting trial on the main varieties of cotton in Jiangsu Province, focusing on changes in cotton leaf area and the relationship between dry weight and its impact on economic output and environmental conditions (mainly light, warm, water ) The role played by the analysis is as follows: First, the dry weight and leaf area changes in the relationship between the cotton flower weight per plant after the rapid growth. Before and after the sowing (around May 20), 40 to 50 days of rapid growth can be extended to the end of August