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通过对城市污泥及其堆制的有机肥田间对比试验,探讨了城市污泥及其堆肥对土壤农业化学性质的作用时效与作用后效。结果表明,施用城市污泥及其堆制的有机堆肥导致土壤的水解酸下降,盐基饱和度增加。城市污泥及其堆肥处理相应提高了土壤速效磷的含量2.9～7.9倍和3.1～6.5倍。在作用后效方面,水解酸随着施入的有机肥剂量增加而降低。城市污泥及其堆肥在作用后效方面与上年相比,盐基饱和度相应降低了21%～33%和12%～13%,土壤中速效磷含量增加10%～26%,对于有机堆肥,土壤中速效磷含量降低了16%～32%。
Through the contrast test of urban sludge and organic manure compost, the effects of municipal sludge and its compost on agrochemical properties of soil were discussed. The results showed that the application of municipal sludge and composted organic compost resulted in the decrease of soil acidity and the increase of base saturation. The municipal sludge and its compost treatment increased the content of available phosphorus in soil by 2.9 ~ 7.9 times and 3.1 ~ 6.5 times, respectively. In terms of effect after treatment, the amount of hydrolysed acid decreases with the amount of organic fertilizer applied. Compared with the previous year, the urban sewage sludge and its compost showed 21% -33% and 12% -13% lower base saturation and 10% -26% more available phosphorus in the soil, respectively, Composting, soil available phosphorus content decreased by 16% to 32%.