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针对凯佐乡粮田坝千亩以上酸性煤锈水田土壤酸度大、不长绿肥等生产问题，采用“改水、改土、培肥”相结合，试验研究与示范推广同步进行的方法，以黄磷炉渣粉为主，石灰为辅对土壤进行了改良试验。３年试验结果表明：１、黄磷炉渣粉的营养、增产作用优于石灰，石灰对于中和酸性的改良作用大于黄磷炉渣粉；２、亩用黄磷炉渣粉５０ｋｇ产投比为２．６８～５．７２：１，亩用石灰１００ｋｇ达１．４１～３．０５：１，为两种改良剂最佳用量；３、亩用黄磷炉渣粉１５０ｋｇ或亩用石灰１００ｋｇ可作为控制“灌溉水及盐浸耕层土壤ｐＨ均为４．０的煤锈水田土壤”ｐＨ继续下降的下级指标，亩用石灰３００ｋｇ可作为这类土壤改良用量的上限指标；４、示范推广采用亩施黄磷炉渣粉５０ｋｇ，１９９２年秋播光叶苕子５０亩，加上其他农技措施，２／３的面积绿肥生长良好。粮田坝的酸性煤锈田低产问题初步得到了解决。
Aiming at the problems such as the acidity and acidity of soil in acid paddy field of Ketian Township with more than one mu of grain field, the method of “changing water, improving soil and fertilizing” was adopted, and the method of experimental research and demonstration and extension Yellow phosphorus slag powder, lime supplemented the soil was tested. The results of 3 years showed that: 1, the nutrition and yield increase of yellow phosphorus slag powder is better than that of lime; the improvement effect of lime on neutral acidity is greater than yellow phosphorus slag powder; 68 ~ 5.72: 1, 100kg of lime reachs 1.41 ~ 3.05: 1, which is the best dosage of two improvers; 3, 150kg of yellow phosphorus slag or 100kg of lime per mu can be used as control " Soil pH in irrigation water and salt-leaching topsoil was 4.0. The pH value of soil in the paddy soil continued to decline, and the upper limit index of 300 kg mu of lime could be used as the improvement index of this kind of soil. 4, Phosphorus slag powder 50kg, autumn 1992 lobular balm 50 acres, together with other agricultural measures, 2/3 area of green manure grow well. The problem of low yield in the acidity coalfield of grain field dam has been initially solved.