随着我国农业科技工作的发展和普及,近年不少同志来信了解叶面积测量和计算方法。由于常规方法比较繁琐,广大农村有关仪表或工具不备,致使油菜叶面积诊断工作受到阻碍。研究表明,叶面积系数在小雪节苗期同产量高度相关。在59—551斤范围内,1979—1983年4年41块田210株分析, With the development and popularization of agricultural science and technology work in our country, many comrades in recent years have come to understand letter leaf area measurement and calculation methods. As the conventional method is more complicated, the majority of rural instruments or tools are not prepared, resulting in rape leaf area diagnostics are hindered. Studies have shown that the leaf area coefficient in the snowy season seedling stage is highly correlated with the yield. In the range of 59-551 kg, 410 plots of 41 plots from 1979 to 1983 were analyzed,