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供试土壤为酸性土(pH5.5),两种污泥肥料,即来自市区(工业区)与郊区的污泥,前者以泥浆(约含20%干污泥)状施,后者以颗粒状的泥球干施,从1973至1979年连续试验7年.郊区污泥平均含N1.1%,每克污泥含Zn与Ca分别为479.7与6微克,而市区污泥含N量平均约为郊区的3倍,Zn为5-10倍,Ca为5-20倍.小区面积2.4×3.0米,每年于春季4或5月播种,8月收获.播种前2周施污泥,用量分别为45,90,135,180及225吨/公顷,以不施肥为对照.并设NPKS处理,即施N336,P350,K112与S92公斤/公顷.供试大麦品种为Mariout.每年收获后,籽粒与麦秆取样称重并分别分析Zn与Ca的含量.
The test soil is acidic soil (pH5.5). Two types of sludge fertilizers, sludge from urban areas (industrial area) and suburbs, the former applied with mud (about 20% dry sludge) Granular mud ball drying facilities, continuous test from 1973 to 1979 for 7 years.The average suburban sludge containing N1.1% per gram of sludge containing Zn and Ca were 479.7 and 6 micrograms, while urban sludge containing N The average amount is about 3 times the suburbs, Zn is 5-10 times, Ca is 5-20 times. The plot area of 2.4 × 3.0 meters, sown in April or May each spring, harvest in August. Sludge 2 weeks before sowing , Respectively, the amount of 45,90,135,180 and 225 tons / hectare, no fertilization as a control and set NPKS treatment, namely the application of N336, P350, K112 and S92 kg / ha for the test barley varieties Mariout. After each harvest, the grain and Straw samples were weighed and analyzed for Zn and Ca contents, respectively.