본 연구는 보리-헤어리베치 단파 및 혼파가 녹비생산량과 벼 재배시 무기질 비료 대체 효과를 평가하기 위해 실시되었다. 보리-헤어리베치 혼파를 통한 녹비생산량은 보리 75% + 헤어리베치 25% 혼파구에서 8.07 Mg/ha로 가장 높게 나타났다. 그리고 녹비생산을 통한 질소 축적량도 녹비 생산량이 가장 높은 보리 75% + 헤어리베치 25% 처리구에서 131 kg/ha로 가장 높게 나타났다. 혼파처리구의 전체 biomass 생산량 중에서 헤어리베치가 차지하는 비율이 증가할수록 보리 중 질소 함량은 증가되었다. 녹비재배 후 전량을 토양에 환원 후 벼 재배를 실시한 결과 혼파구(B75H25, B50H50, B25H75)의 벼 수량은 큰 차이가 없었으며 이는 관행구(NPK) 보다 약 7%의 증수 효과가 있었다. 따라서 보리와 헤어리베치 혼파는 무기질 비료 무시용에 의한 벼 재배가 가능할 것으로 판단되었다.
BACKGROUND: The mixtures of legumes and non legumes can be an efficient tool to combine the benefit of the single species in the cover crop practice. However, there is a lack of information on how the species proportion may affect N accumulation and how this can influence the nitrogen use of subsequent rice production. METHODS AND RESULTS: In this study barley and hairy vetch was selected as a green manure. The pure stands or mixtures with different seeding ratios was tested on green manure N accumulation and its following rice cultivation. Total aboveground biomass and N accumulation of mixture were higher compared to that of pure barley and hairy vetch. Among the mixtures, the highest aboveground biomass (8.07 Mg/ha) and N accumulation (131 kg/ha) was observed in B75H25 (barley 75% + hairy vetch 25%). The N accumulation of the mixture ranged from 99 kg/ha to 131 kg/ha which was much higher than amount of recommended (90 kg/ha) for rice. All mixture (barley 75%+hairy vetch 25%, barley 50%+hairy vetch 50%, barley 25%+hairy vetch 50%) produced 7-8% more rice yield than the conventional cultivation (NPK). The rice yield of in barley monocrop was 4% less than that of NPK. COLCLUSION(S): Adopting mixtures of barley and hairy vetch could be efficient strategy for rice production as an alternative of nitrogen fertilizer.
