生活污泥对白菜供磷和土壤磷状况的影响

采用好气培养和盆栽试验以探明污泥磷的肥效,降低污泥施用导致的土壤磷累积引起的环境风险。结果表明,单施污泥土壤有效磷含量和白菜吸磷量均显著低于施用磷酸一铵和鸡粪处理;施用污泥后有利于增加白菜生长后期土壤磷酸酶的活性和土壤Olsen-P含量。在白菜等产量条件下,单施污泥处理土壤中Olsen-P残留量显著高于污泥与化肥混施处理;在P2O5施用量为902~70 kg/hm2时,污泥堆肥磷的肥效为磷酸一铵的25%左右。

Availability and Chinese cabbage uptake of phosphorous in the soil amended with domestic sewage sludge

A laboratory incubation method and a pot culture experiment were conducted with the objective of investigating the phosphorus efficiency of sewage sludge and decreasing the environmental risk due to the accumulation of P in soils. After sewage application, soil available phosphorus and total phosphorus absorbed by Chinese cabbage (Brassica penkinensis) are significantly (P<0.05) lower than those of only applying with monoammonium phosphate (MAP) or chicken manure. Soil phosphatase activities and available P at late growth stage of Chinese cabbage are increased under the sewage sludge application. The content of residual Olsen P which applied with single sewage sludge significantly is higher than that of applying with sewage sludge and MAP mixed when the yields of Chinese cabbage have no significant difference. When applying amount of P_2O5 is 90-270 kg/ha, the phosphorus efficiency of sewage sludge is 25% of that of MAP.