This research carried out to investigate the effects of application of hairy vetch instead of duck-releasing in a large scale of duck-releasing cultivation. The results are as followed; Cultivation of hairy vetch, a green manure crop, for the winter season seemed to be a possible natural fertilizer to supply crop mineral nutrients. Application of hairy vetch residues improved physical properties of soil and was possible to assure better productivity of agricultural products. Introduction of hairy vetch into a large scale of duck-releasing cultivation reduced the pollution of agricultural water.

Ⅰ. 서언 Ⅱ. 재료 및 방법 Ⅲ. 결과 및 고찰 Ⅳ. 적요 참고문헌

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