【摘要】 施氮量与单株叶面积呈极显著正相关，γ＝0．998**；N120处理的叶面积指数最大值为4．87，LAI3．0持续时间长达40天以上，符合高产的LAI动态规律；叶绿素含量与光合速率呈二次曲线相关，最佳叶绿素含量为1．27mg／g；在各氮素水平处理中，N120处理的单株光合速率和群体光合速率均处于最高水平，有利于产量形成和糖分积累。更多还原

【Abstract】 There is a sienificantly positive correlation between nitrogen amount and individual plan leaf area of sugar beet, γ=0.998. Maximum leaf area index (LAI)is 4.87 by deal with N120, and LAI is 3.0 as long as 40 days. It suits to LAI dynamic development reguation of high vield. There is a non - linear correlation between chlorophyll content and photosynthetic rate, but best chlorophyll content is 1. 27ngg. In diffirent nitrogen, the individual and population photosynthetic rate are all the highest lev els, and are good for yield formation and sucrose content acculation.更多还原