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目前,“土地越种越瘦,施肥效益越来越低,产量逐年下降”已成为普遍现象。据河南省社旗县土肥站三年定点土壤化验结果表明,土壤钾元素每年以95毫克/公斤的速度递减。近年来,大豆、芝麻、绿豆黄化病严重发生。棉田因缺钾和微量元素而发生的凋枯病面积逐年增加。因此,全面实施“沃土计划”,切实培肥地力,不断提高土壤肥力,是建设旱作农业高产穗产良田的根本途径。
At present, it has become a common phenomenon that “more and more land is leaner in land, the benefits of fertilization are getting lower and lower, and the output is declining year by year.” According to three-year soil tests carried out by Soil and Fertilizer Station of Sheqi County, Henan Province, soil potassium showed a decreasing rate of 95 mg / kg per year. In recent years, soybean, sesame, mung bean yellowing occurs seriously. Cotton fields due to potassium and trace elements of the occurrence of blight area increased year by year. Therefore, the full implementation of the “fertile soil project” to effectively fertilize fertility and continuously improve soil fertility is the fundamental way to build high-yielding dryland fertile farmland for dry farming.