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1979～1983年在上海郊区青紫泥类型土壤上进行了长期定位试验,表明了此类土壤有较高的生产力和潜在肥力。有机肥(猪塮)在连续五年与无肥区对比中增产效果愈来愈明显,产量变异较小,并对土壤有机质和氮、磷、钾以及微量元素锌等养分提高有一定作用。稻草还田必须配合一定量的氮化肥。长期配合施用氮、磷、钾化肥,对作物单产暂不产生影响,但单施氮磷化肥,第二年早稻(第三季以后的早稻)明显减产,钾素除有机肥以外的处理,都有亏损。试验表明,在现有双三制的耕作制度下,由于长期淹水,有效锰量表现递减。
Long-term experiments were carried out on the purple soil types in Shanghai suburbs from 1979 to 1983, indicating that these soils have higher productivity and potential fertility. Organic fertilizer (Pork 塮) increased yield more and more obvious in five consecutive years compared with no-fertilizer area, yield variation was small, and had some effect on the increase of soil organic matter, nitrogen, phosphorus, potassium and trace element zinc. Straw must also cooperate with a certain amount of nitrogen fertilizer. Long-term cooperation with the application of nitrogen, phosphorus and potassium fertilizers, crop yield does not have an impact, but the single application of nitrogen and phosphorus fertilizer, the second year of early rice (third season after the early rice) significantly reduced production of potassium in addition to organic fertilizer treatment, There is a loss. Experiments show that under the existing double-three farming system, due to prolonged flooding, the effective manganese content decreases.