Abstract
Applying livestock manure compost to soil can enhance soil fertility and crop productivity. However, little information is available on the effect of continuous application of manure compost on crop growth in Korea. The object of this study was to investigate the residual and continuous application effect of chicken manure compost on chinese cabbage yield and soil chemical properties. The experiment was conducted in the pot ($0.5\;m^2$) without bottom buried in the soil and set up in a completely randomized design with three replication. The treatment consists of chemical fertilizer with nitrogen (NPK, $N-P_{2}O_{5}-K_{2}O$ 320-78-198 kg/ha) and without nitrogen (PK, $N-P_{2}O_{5}-K_{2}O$ 0-78-198 kg/ha), and chicken manure compost at a rate corresponding to 320 (COM1) and 640 (COM2) kg N/ha. This experiment was carried out for three cropping seasons with chinese cabbage. Chemical fertilizer, NPK and PK, was applied every cropping season. In the first cropping season, compost was applied in nine pots (COM-A). In the second cropping season, compost was applied in the six pots of COM-A (COM-AA) and in three pots of COM-A compost was not applied (COM-AN). In next cropping season, compost was applied in the three pots of COM-AA (COM-AAA) and in the other three pots of COM-AA compost was not applied (COM-AAN). COM-AN pots remained without compost application in the third cropping season (COM-ANN). Yields of chinese cabbage of COM1-AAA and COM2-AAA were reached 78 and 96% as compared with NPK, and nitrogen utilization rate was about 85% (COM1-AAA) and 97% (COM2-AAA) as compared with NPK Residual N uptake rates during the second and third cropping season after compost application at the first cropping season were 49.7 (COM1-AN) and 35.6% (COM1-ANN) in COM1, and 56.9 (COM2-AN) and 37.4% (COM2-ANN) in COM2 compared with NPK treatment After three cropping seasons, soil pH and contents of available phosphorus, exchangeable potassium and soil organic matter were increased with continuous application of chicken manure compost.
본 연구는 계분퇴비를 질소 함량 기준으로 320 kg N/ha(COM1) 및 640kg N/ha(COM2) 을 3작기 시용 후 배추 수량과 토양의 이화학적 특성에 미치는 연용 및 잔효를 평가하였다. 배추 수량은 COM1 및 COM2 3작기 연용 처리구에서 삼요소 치리구(NPK) 대비 각각 78 및 96%를 나타내었다. 이때 질소 이용률은 NPK 처리구와 비교하여 COM1 및 COM2에서 각각 85 및 97%이었다. 첫 작기에 사용한 계분퇴비 처리구의 두 번째 및 세 번째 작기의 잔여 질소 흡수량은 NPK 처리구 대비 COM1의 경우 49.7% 및 35.6%, COM2의 겅우 56.9% 및 37.4%를 나타내었다. 그리고 세 번째 작기의 COM1과 COM2의 잔여 질소 흡수량은 무질소 처리(PK)와 큰 차이가 없었다. 한결, pH를 비롯한 토양 화학성의 변화를 조사한 결과 유효인산, 치환성 칼리, 유기물 함랑은 계분퇴비를 연속시용 함에 따라 매 작기 증가하는 양상을 나타내었으며, 특히 유효인산 및 치환성 칼리 함량의 증가가 두드러졌다.