신개간지(新開墾地) 토양(土壤)에서 퇴비(堆肥)와 볏짚시용(施用)이 대두생육(大豆生育)에 미치는 영향(影響)

Effects of Compost and Rice Straw Application on Growth of Soybean Plant in Newly Reclaimed Upland Soil

신개간지토양(新開墾地土壤)에 볏짚과 퇴비시용시(堆肥施用時) 토양(土壤)의 화학적(化學的), 수분함량(水分含量), 미생물(微生物) 및 대두생육(大豆生育)에 미치는 영향(影響)을 검토(檢討)하기 위해 미사질식양토(微砂質埴壤土)인 야산(野山)을 개간(開墾)하여 볏짚과 퇴비(堆肥)를 각각(各各) 3수준(水準)씩 처리하고 이때 공급(供給)되어지는 질소(窒素), 인산(燐酸) 및 가리량(加里量)의 차이(差異)는 화학비료로서 조절(調節)하여 포장시험(圃場試驗)을 실시한 결과(結果)는 다음과 같다. 1. 퇴비시용(堆肥施用)은 대두수량(大豆收量)을 증가시켰고, 볏짚시용(施用)은 대두(大豆)의 생육(生育)은 왕성(旺盛)했으나 수량(收量)에는 영향(影響)을 주지 못했다. 2. 퇴비시용(堆肥施用)은 유합기(幼陜期)(8월(月) 14일(日)) 대두(大豆) 경엽중 인산(燐酸), 가리(加里) 및 칼슘함량(含量) 증가로 대두(大豆)의 입경율이 증가됐으나 볏짚구는 경향(傾向)이 없었다. 3. 토양중(土壤中) 수분함량(水分含量)은 유기물시용구들은 무시용구보다 대체로 높았으나 수분함량(水分含量)이 위조점이하(萎凋点以下)일때는 유기물시용(有機物施用)이 무시용(無施用)보다, 퇴비시용(堆肥施用)이 볏짚시용구보다 더 낮았다. 4. 토양(土壤) pH가 더 높았던 퇴비시용구가 볏짚시용보다 대두(大豆)의 근류착생량(根瘤着生量)이 더 많았고 세균(細菌) 및 사상균수는 더 적었다.

A field experiment was conducted to compare the effects of compost and rice straw application on the growth of soybean, chemical properties and soil microorganism in newly reclaimed silty clay loamy upland soil. Application rates of the arganic materials were 750 Kg, 1,500 Kg and 3,000 Kg/10a in compost, and 340 Kg, 680 Kg and 1,360 Kg/10a in rice straw. The differences of N.P.K. application rates caused by the two different organic materials were balanced by chemical fertilizers of N.P.K. The results can be summarized as follows; 1. The yield of soybean was increased upon compost application, but no significant difference on yield was observed except luxuriant plant growth upon rice straw application. 2. There was highly possitive correlation between concentration of phosphorous, potassium in soybean plant at 71 days after planting and dry weight of grain vs. stem plus bean chaff of harvest plant in compost applied plots, but no correlation was found in rice straw applied plots. 3. In greneral, the soil water contents in organic material applied plots, expecially in plots of rice straw, were higher than in no organic material plots. However, at wilting point, the soil water content in organic material applied plot was lower compare to no organic material plot. 4. The weight of nodules per soybean plant was heavier notwithstanding the fewer number of soil bacteria and fungi in compost application plots than rice straw application plots.