我区许多地方,土地生产条件差异很大。过多的低产田成了限制粮食产量进一步提高的一大障碍。有的地方为了盲目地追求产量,不断增加化肥的投入,结果产生“肥效递减效应”,土地越种越薄,甚至土壤板结、耕性变差,成为农业生产中亟待解决的问题。杭锦后旗小召乡农民谢善同,特别注重对低产田的改造,为改良低产田积累了经验。1982年他承包了30亩耕地,亩产量仅200—250公斤,他综合采用了几项措施,土壤肥力不断提高,平均每年增粮千斤以上,承包 In many parts of our region, land production conditions vary greatly. Too much low-yield fields have become a major obstacle to further increases in food production. In some places, in order to blindly pursue output and increase investment in fertilizer, the result is a “declining effect of fertilizer efficiency.” The more thinning the soil is, the more soil compaction and the tillage become worse. This has become an urgent problem to be solved in agricultural production. Xie Shan, a small farmer from Hangjinhou Banner, paid special attention to the transformation of low-yielding fields and accumulated his experience in improving low-yielding fields. In 1982, he contracted 30 mu of cultivated land with a yield of only 200-250 kilograms per mu. He comprehensively adopted several measures to continuously improve the soil fertility and increase the average grain yield by more than one kilogram per year.