Distribution of Zn and Cu Applied with Sewage Sludge Composts to the Field

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  • 下水汚泥コンポスト長期連用圃場における下水汚泥由来亜鉛および銅の土壌-作物系での分配
  • ゲスイ オデイ コンポスト チョウキ レンヨウ ホジョウ ニ オケル ゲスイ オデイ ユライ アエン オヨビ ドウ ノ ドジョウ サクモツケイ デノ ブンパイ

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Abstract

Distribution of Zn and Cu applied with sewage sludge composts was investigated, in fields with continuous application of sewage sludge composts over 26 years since 1978. Zinc accumulation in soil was obviously observed in compost and dried sludge-applied plots. However, in the last 10 years, no remarkable increase was found in compost plots, indicating a tendency of increased repression or stagnation. On the other hand, Cu accumulation in the soil was not remarkable. No differences of significance in pH values and Zn and Cu concentrations were found in the 30-100cm depth between compost and dried sludge plots and control (chemical fertilizer) plot, indicating no leaching of Zn or Cu, whereas some significant differences were observed in the 0-20cm depth. Lateral movement of Zn up to about 10% occurred in the field because of plowing, causing a loss of Zn from the applied plot. The plowing also resulted in vertical movement of Zn within 0-20cm depth. The amounts of Zn in barley plants grown in a compost-applied plot were similar to those in the control plot. The proportion of plant uptake Zn in the total soil Zn were very small in both the compost plot (0.16%) and control plot (0.47%). It is concluded that almost all Zn and Cu which were applied with sewage sludge composts remained in 0-20cm depth of soil layer, no leaching of Zn occurred, and Zn uptake by plants seems to be as much as plants needed under our experimental conditions.

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