Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Effects of Sewage Sludge Composts on the Chemical Properties of Soil and Growth of Paddy Rice

하수슬러지 퇴비 시용이 토양의 화학성 및 벼 생육에 미치는 영향

  • Lee, Hong-Jae (Dept. of Agricultural Chemistry, Gyeongsang National Univ.) ;
  • Cho, Ju-Sik (Dept. of Agricultural Chemistry, Sunchon National Univ.) ;
  • Lim, Young-sung (Dept. of Agricultural Chemistry, Gyeongsang National Univ.) ;
  • Ban, Kyung-Rye (Dept. of Agricultural Chemistry, Gyeongsang National Univ.) ;
  • Shin, Woon-Kyo (Dept. of Agricultural Chemistry, Gyeongsang National Univ.) ;
  • Heo, Jong-Soo (Dept. of Agricultural Chemistry, Gyeongsang National Univ.)
  • Published : 1999.03.30
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Abstract

To investigate the effects of the composts made of sewage sludges on the physico-chemical properties of soil and growth of paddy rice, the variations of chemical properties in soil, the contents of inorganic matters and heavy metals in plant tissues, the contents of heavy metals in brown rice, the growth response of paddy rice and grain yield were investigated. The results were summarized as follows : The contents of organic matters, N, available $P_2O_5$ and exchangeable K in soil were increased by application of the composts. The contents of N and available $P_2O_5$ in soil were remarkably decreased at the harvesting time in comparing with the 20th day after application of the composts. The contents of heavy metals in soil were increased very slightly by application of the com-post. At the harvesting time, the contents of N and K were not varied in all plant tissues at the plot of the compost in comparing with the plot of the NPK. The content of $P_2O_5$ in plant was increased by application of the composts. The contents of heavy metals in plant tissues and brown rice were not changed among the treatments. When the composts were applied to the pot at the rates of 1,000, 2,000, 4,000 and 6,000kg/10a with NPK, the numbers of grain yield were increased with 3, 18, 44 and 54% in comparing with NPK plot, respectively. Dry weight, the numbers of tillers and spikelet of the rice plant were increased by application of the composts.

하수슬러지의 농지이용가능성을 조사하기 위하여 하수슬러지를 주원료로 하여 생산된 퇴비를 토양에 처리함으로써 벼 생육시기별 토양의 화학적 특성 변화, 식물체중 무기성분 및 중금속함량 변화, 현미중 중금속함량변화, 작물생육상황, 수량 및 수량구성요소 등을 조사하였다. 토양중 유기물, 질소, 유효인산 및 치환성카리는 퇴비시용 20일 후 퇴비시용량이 증가할수록 증가하였으며, 수확기에는 퇴비시용 20일 후에 비하여 질소, 유효인산은 현저히 감소하였고, 토양중 중금속함량도 퇴비시용량이 증가할수록 증가하였으나 그 증가 폭은 매우 미미하였다. 수확기의 식물체 부위별 질소 및 카리함량은 퇴비시용구가 대조구에 비하여 모든 부위에서 별 차이가 없었으나, 인산함량은 퇴비시용량이 증가할수록 증가하였다. 그리고 식물체 부위별 및 현미중 중금속함량은 처리간 별 차이가 없었다. 벼 수량은 삼요소에 하수슬러지 퇴비를 각각 1,000, 2,000, 4,000 및 6,000kg/10a 시용 하였을 경우 삼요소구에 비하여 각각 약 3, 18, 44 및 54%증가되었으며, 벼의 건물중, 분얼수 및 주당입수는 하수슬러지 퇴비의 시용으로 증가하였다.

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