我省麦棉两熟地区,棉田前茬作物布局变化很大,大小麦比例增大,蚕豆和冬绿肥面积逐年减小,用地与养地矛盾加剧。据我所1972年在麻城县中一公社测定,棉田耕层有机质、全氮、全磷的相对含量同1960年相比分别有不同程度下降。为了增加棉田有机肥料,我系从1973年以来连续在沔阳基点与沔阳、新洲、天门等 The area with double crop of wheat and cotton in our province had a big change in the layout of the cropland before the cotton crop, the proportion of large wheat to wheat increased, the area of ​​broad bean and winter green manure decreased year by year, and the contradiction between land and cultivated land intensified. According to our determination in a commune of Macheng County in 1972, the relative contents of organic matter, total nitrogen and total phosphorus in the topsoil of cotton fields dropped to some extent from those in 1960 respectively. In order to increase the organic fertilizer in cotton field, I have been working in Yangyang, Xinzhou and Tianmen since 1970