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通过青紫泥土壤12年（24季）化肥的长期定位试验，结果表明，氮素化肥对水稻而言，无论在起始阶段还是在目前都是产量的限制因素，与无肥区相比，增产幅度随着时间的延长而增加，12年平均为44．8％～50．4％；磷素对旱作有明显的增产效果，对水稻则不明显，为平均年增产10．5％；钾素起始对水稻和小麦都没有效果，但随着定位试验时间的延长，效果有所表现，增产幅度平均为13．4％，但不同年份表现不一。土壤贡献率经过12年定位试验后，由原来的80％以上降低到50％～55％。在土壤肥力方面，12年施用化肥区和无肥区比，土壤物理性质无显著差异，土壤全氮和有机质每年分别下降1．25％和1．33％，土壤速效养分无磷、钾区都大幅度下降。
The results of long-term experiment of 12-year (24 season) fertilization on the soil of purple clay showed that the nitrogenous fertilizer was the limiting factor for the yield of rice in both the initial stage and the present stage. Compared with the no-fertilizer area, The amplitude increased with time, with an average of 44.8% ~ 50.4% in 12 years. Phosphorus had a significant yield increase effect on dry land, but not on rice, with an average annual yield of 10.5%. Potassium The prime start had no effect on rice and wheat, but with the extension of the positioning test, the effect was shown. The yield increase averaged 13.4%, but the performance was different in different years. After 12 years of positioning experiment, the contribution rate of soil decreased from above 80% to 50% -55%. In terms of soil fertility, there was no significant difference in soil physical properties between 12-year application of chemical fertilizers and no-fertilizers. Total nitrogen and organic matter in soil decreased by 1.25% and 1.33%, respectively. Soil available nutrients were free of phosphorus and potassium Dropped significantly.