시설재배지에서 유기복합비료 시용량에 따른 상추 생육 및 토양화학성에 미치는 영향

Effects of Application Amount of Organic Compound Fertilizer on Lettuce Growth and Soil Chemical properties under Plastic film house

국가정책사업인 유기질비료 지원사업은 1999년부터 시작되었고, 유기질비료의 과다 시용은 시설재배지의 양분집적을 초래했다. 시설상추재배시 안정적인수량 확보와 과다 시비로 인한환경오염을 예방하기위해 유기복합비료의적정 추천량 기준을 설정하고자 시험하였다. 유기복합비료의 무기질 질소 기비량의 대체비율은 토양검정 질소 기비량(8.6 kg 10a-1 )을 기0 준으로 1 %0에서 작물수량이 높았다. 토양의 질산태질소와 전기전도도도 무기질비료 처리구보다낮은 함량을 나타냈다. 또한, 기비량 100%를 유기복합비료로 대체한 경우에 질소이용율은 23%로 무기질비료 처리구와유사하게 나타났다. 이러한 결과로부터 상추의 수량을 증가시키고 토양 중에 투입된 비료성분의 토양 잔류 정도를최소화하는 관점에서는 유기복합비료를 무기질 질소 기비량의 100%를 대체하는 것이 타당하다고 판단된다.

The Project supporting organic fertilizer started in 1999 as a national policy. In farmhouse, over application of mixed organic compound fertilizer(OC) caused salt accumulation in plastic film house soil. To replace inorganic fertilizer with OC fertilizer, this study was investigated the effect of OC application on yield and soil chemical properties for lettuce cultivation in plastic film house. The OC fertilizer was applied at 50(OC50+N50), 100(OC100), and 150(OC150) % level of the basal amount of nitrogen fertilizer in soil testing recommendation. And these were compared to NPK(nitrogen, phosphat, and potash fertilizer) and PK treatment. The yield of lettuce in OC100 was similar to that of NPK treatment. In OC 50, 100a nd 150t reatments, pH had a tendency to increase than that of NPK treatment. Nitrate nitrogen(NO3-N) and electrical conductivity(EC) were similar to NPK treatment. These showed that nutrients from OC fertilizer were less likely to accumulate in soil than NPK. Also, use efficiency of nitrogen in OC100 treatment were similar to NPK treatment. These results suggest that OC application as the basal dressing at the 100% level could be best to prevent a nutrient accumulation of soil and to increase the yield and commercial quality for lettuce.