生态学杂志2012，Vol.31Issue(2)：324-331,8.
播期对春小麦生长发育及产量的影响
Effects of sowing date on the growth and yield of spring wheat
摘要
Abstract
In order to provide basis for high-yielding cultivation of spring wheat in semi-arid region, a field experiment was carried out in Dingxi of Gansu Province, Northwest China in 2010 to study the effects of different sowing dates ( March 8, March 18, March 28, and April 7 ) on the growth and development and yield formation of spring wheat. With the delay of sowing date, the days from sowing to heading stage shortened, resulting in an evident shortening of the whole growth period. Before late May, the earlier the sowing, the larger the leaf area index (LAI) was; after late May, the later the sowing, the larger the LAI. Early sowing made the peak of LAI advanced, while late sowing postponed the peak of LAI. Before late June, the earlier the sowing, the higher the chlorophyll content was; after late June, the earlier the sowing, the faster the decline of chlorophyll content. The population growth rate and net assimilation rate after heading stage had significant differences among different sowing dates, being the highest when the sowing date was March 18 and the lowest when the sowing date was April 7. Whatever the sowing date, the dry matter accumulation of wheat plants increased rapidly at jointing stage. Early sowing made the dry matter accumulation before jointing stage slower. With the delay of sowing date, the dates with the peak values of dry matter accumulation rate advanced, those with the peak values of grain filling rate postponed, and the 1000-kernel weight decreased after an initial increase.Sowing date had significant effects on the grain parameters at three grain filling phases. The grain yield differed significantly with sowing dates, being the highest when the sowing date was March 8.关键词
春小麦/播期/生长发育/产量Key words
spring wheat/sowing dale/growth and development/yield分类
农业科技引用本文复制引用
张凯,李巧珍,王润元,郭林,雷俊,王艳斌,王鹤龄..播期对春小麦生长发育及产量的影响[J].生态学杂志,2012,31(2):324-331,8.基金项目
国家公益性行业(气象)科研专项(GYHY200806021、GYHY201106029)、干旱气象科学研究基金项目(IAM201006)和甘肃省气象局第二批青年优秀人才基金联合资助. （气象）
