Study on the Optimum Levels of Sewage Sludge Application for High Yielding Rice Variety

다수계(多收系) 수도품종(水稻品種)에 대(對)한 부숙(腐熟) 오니(汚泥) 시용량(施用量) 결정(決定)

An attempt was made to determine the optimum levels of sewage sludge application for seogwangbyeo in the farmer's field. 1. Optimum amount of sewage slude application was 338kg/11a at the fertilizer (N-P-K) level of 15-10-10kg/10a, 430kg/10a at that of 7.5-10-10kg/10a and 544kg/10a at no fertilizer. 2. Number of tillers during all growing period were increased with amounts of sewage sludge and/or chemical fertilizers. 3. Panicles per hill was increased but percent ripeness was decreased with the application of increasing level of sewage sludge and/or chemical fertilizer. In particular, the decrease of ripeness among yield-related components sotood out as an important one to be solved for higher yield. 3. Panicles per hill was increased but percent ripeness was decreased with the application of increasing level of sewage sludge and/or chemical fertilizer. In particular, the decrease of ripeness among yield-related components stood out as an important one to be solved for higher yield. 4. Ripeness was remarkably decreased in high nitrogen content of soil and rice plant under heavy amounts of sewage sludge and/or chemical fertilizer. 5. Ripeness that had direct effect on yield showed significantly possitive correlation with the content of $SiO_2$ and $SiO_2/N$ in rice plant from 25 days after transolanting to harvesting stage. 6. Maximumutillzation of nitrogen and its production efficiency of absorbed nitrogen in sewage sludge were 16.6% and 31.9kg (Yield/kg, N) at the level 15-10-10kg/10a as fertilizer with amounts of sewage sludge application, and 19.0% and 31.8kg (yield/kg, N) at sewage sludge application without fertilizer.

맥주오니(麥酒汚泥)의 시용적합(施用適合) 및 시용량(施用量)에 대(對)하여 화동(華東) 식양토(埴壤土)에 서광(曙光)벼를 공시(供試)한 포장시험(圃場試驗)으로부터 얻어진 결과(結果)를 요약(要約)하면 다음과 같다. (1) 최고수량(最高收量)을 생산(生産)한 부숙오니(腐熟汚泥)의 적정시용량(適正施用量)은 화학비료(化學肥料)($N-P_2O_5-K_2O$)15-10-10kg/10a와 병용시(倂用時)는 338(오니질소(汚泥窒素): 16.9)kg/10a, 7.5-10-10와 병용시(倂用時)는 430(21.5)kg/10a, 무비시(無肥時)에는 최고오니(最高汚泥) 수준(水準)인 544(27.2)kg/10a이었다. (2) 화학비료(化學肥料)를 증시(增施)하거나 또는 화학비료(化學肥料) 시용여부(施用如否)에 관계(關係)없이 오니(汚泥) 시용량(施用量) 증가(增加)와 비례(比例)하여 생육시기별(生育時期別) 경수가 증가(增加)하였다. (3) 화학비료(化學肥料) 질소(窒素) 및 오니(汚泥)의 적정량(適正量) 이상(以上)의 다량시용(多量施用)으로 주당수수(株當穗數)는 증가(增加)한 경향(傾向)이나 등숙율(登熟率) 저하(低下)로 수량(收量)이 감소(減少)하였다. (4) 이는 화학비료(化學肥料) 또는 오니(汚泥) 다량(多量) 시용시(施用時) 토양중유효질소(土壤中有效窒素) 함량(含量)이 많아서 수도(水稻) 유수형성기(幼穗形成期) 이후(以後) 수확기(收穫期)까지 경엽중(莖葉中) 질소함량(窒素含量) 과다(過多)에 기인(基因)된 것으로 생각된다. (5) 수량증가(收量增加)에 지배적(支配的)이었던 등숙율(登熟率)과 수도경엽중(水稻莖葉中) 생육시기별(生育時期別) 규산함량(珪酸含量) 및 규산(珪酸)/질소함량비(窒素含量比) 와는 정(正)의 상관관계(相關關係)가 있었다. (6) 오니질소(汚泥窒素)의 최대이용율(最大利用率) 및 흡수질소(吸收窒素) 생산효율(生産效率)은 화학비료(化學肥料)(15-10-10kg/10a)와 병용(倂用)한 경우에는 각각(各各) 16.6%, 31.9kg(정조(正租)/kg, N), 오니(汚泥) 단용시(單用時)는 각각(各各) 19.0%, 31.8kg(정조(正租)/kg, N)이었다.