【摘要】 通过对西峰农业气象试验站观测的玉米叶面积指数资料变化分析得出:玉米叶面积指数年内变化呈缓慢增长—快速增长—缓慢下降趋势;年际变化因发育期不同,环境因子不同,存在着较大差异;叶面积指数的变化与降水相关较好,与积温和日照仅在三叶~七叶期呈现正效应,其它时段相关不显著;玉米产量与抽雄和乳熟期叶面积指数显著相关,抽雄期叶面积指数小于3时,产量不高,达到4以上时,产量开始下降,叶面积指数适合范围为3~4,高产田为3.5以上。更多还原

【Abstract】 By analyzing the data of leaf area index of maize observed in Xifeng Agro-meteorological Experiment Station,it is found that the changing trend of leaf area index in the growth period of maize is slow increase-rapid increase-slow decrease.The leaf area index of various growth periods is much different among years,which is mainly caused by the differences of environmental factors.There is a close correlation between the change of leaf area index and the precipitation,and the leaf area index is positively related to the accumulated temperature and sunlight hours in three leaves to seven leaves period,but not remarkably related to those in other periods.The yield of maize is remarkably related to the leaf area index in heading and milk mature period.When the leaf area index in heading period is less than 3,the output is low;when it is higher than 4, the output begins to decrease;the ideal range of leaf area index is 3~4.更多还原