在我省水稻种植面积中,中低产田占70％左右。所谓中低产田,一般指水稻常年亩产600斤以下的稻田。产量不高的原因,除冷、阴、滥、锈、酸、碱、旱外,主要是土壤肥力差,限制了水稻产量的提高。虽然稻田培肥是根本的措施,但需要的时间较长。因此,借助于合理施用化肥,迅速提高中低产田的产量就有必要进行研究。根据1982年全省水稻科研座谈会商定,由省农科院水稻所,黔东南州(凯里)和安顺、铜仁, In our province rice planting area, middle and low yield fields account for about 70%. The so-called middle and low yield fields, generally refers to rice perennial 600 kg per mu of rice fields. The reason for the low yield is that the poor soil fertility, in addition to cold, overcast, excessive, rust, acid, alkali and drought, limits the increase of rice yield. Although paddy fertilization is a fundamental measure, it takes a long time. Therefore, with the proper application of fertilizers, it is necessary to study the rapid increase of middle and low yield fields. According to the 1982 provincial rice scientific research forum agreed by the Provincial Academy of Agricultural Sciences rice, Qiandongnan (Carey) and Anshun, Tongren,