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由我校农学系许萱教授主持的国家自然科学基金课题《环境生态因素对棉铃发育的影响——温度、水分与棉铃发育的关系》,于1993年5月14日在陕西省教委主持下通过鉴定,专家一致认为:该项目全面系统地研究了温度、水分与棉铃发育的关系,基本上搞清了棉铃各部分的动态发育过程,探索出一些在理论和生产实践上具有重要意义的关键性的科学结论:①温度在20℃以上有利于棉铃发育,19～18℃对棉铃发育已有抑制作用,17℃抑制明显,15℃是棉铃发育趋于停止的临界温度。生产上要取得较高的铃重,棉铃必须在日均温稳定通过15℃的终止期以前至少要有50天的发育时间。②在开花结铃期,土
By the National Agricultural Science Department Professor Xu Xuan presided over the National Natural Science Foundation of China project “environmental ecological factors on the development of cotton bolls - the relationship between temperature, water and boll development”, on May 14, 1993 under the auspices of the Shaanxi Provincial Education Commission Appraisal, experts agree that: the project a comprehensive and systematic study of the temperature, moisture and boll development, basically clear the dynamic development of cotton boll parts, to explore some of the theory and practice of production is of crucial significance Scientific conclusions: ① Temperatures above 20 ℃ are conducive to the development of bolls, 19 ~ 18 ℃ have inhibited the development of cotton bolls, 17 ℃ significantly inhibited, 15 ℃ is the critical temperature of boll development tends to stop. To achieve a higher boll weight in production, the boll must have at least 50 days of developmental time before the mean daily temperature can be stabilized by a 15 ° C cut-off. ② in the flowering period, soil