퇴비 혼합 시용에 의한 요소의 암모니아 휘산 증가 가능성 = Compost Application May Enhance NH3 Volatilization from Co-applied Urea

다국어 초록 (Multilingual Abstract)

Application of compost based on crop P requirement supplemented with synthetic fertilizer N can reduce soil P accumulation and is thus considered an environment-friendly way of using the compost. In the soil, urea is quickly hydrolyzed by urease to NH₃, which can be lost via volatilization. In this study, we investigated NH₃ volatilization from urea co-applied with compost as affected by urea-N application rate and urease activity of compost to help design fertilization strategies that can minimize N loss via NH3 volatilization under the co-application conditions. Eight treatments combining two composts with different urease activities (coded as CL: compost with low urease activity, 257 ㎍ g^-1, and CH: compost with high urease activity, 8625 ㎍ g^-1) and three levels (coded as U1, U2, and U3) of urea application were laid out in a completely randomized factorial design with triplicates. Co-application of compost with a high urease activity enhanced NH₃ volatilization not only from co-applied urea but also from compost or soil N. Our results suggest that co-application of compost with a high urease activity can increase NH₃ volatilization from urea. Therefore, it is suggested that using urea at a low rate and compost with a low urease activity can minimize NH₃ volatilization loss when they are co-applied. Application of compost as a basal fertilizer followed by a delayed fertilization of urea (as additional N input) would be a better alternative.