自1980年以来,我国棉花生产得到了长足的发展,但单产水平却一直不高。1985～1993年的9年间,全国棉花单产虽有起有落,却始终未能达到1984年亩产60公斤的水平,远远低于以色列、澳大利亚等产棉国家。棉花单产徘徊的国家在北方棉区更为突出。山东省1984年和1987年,亩产曾分别达到67公斤和68公斤,之后大幅度下降,1990年降到46公斤,1990年和1992 Since 1980, China’s cotton production has made great strides, but the yield level has not been high. During the nine years from 1985 to 1993, although the cotton yield in the country fluctuated, it still failed to reach the level of 60 kg per mu in 1984, much lower than that of other cotton producing countries such as Israel and Australia. Countries that are hovering in cotton yields are more prominent in the northern cotton area. In 1984 and 1987, the per-mu yield of Shandong Province reached 67 kilograms and 68 kilograms respectively, after which it dropped drastically from 46 kilograms in 1990 to 1990 and 1992 respectively