본 연구는 연구는 아주까리유박을 주원료로 제조되는 유기질비료의 대체자재의 개발 목적으로 혼합유기질발효비료의 양분공급 효과 검증을 위해, 시용 후 상추의 생육 및 토양 특성을 혼합유기질과 비교 분석하였다. 혼합유기질 발효비료는 미강, 주정박, 참깨박, 어분의 혼합비율을 달리하여 비료성분이 질소 5.0, 인산 2.6, 칼리1.4%인 혼합유기질 발효비료 2종 (FA, FB)를 제조하였다. 본 시험은 무처리, 혼합유기질, 혼합유기질 발효비료 처리구로 설정하였으며, 시비량은 시설재배 상추의 표준시비량의 질소기준으로 (70kg ha-1) 혼합유기질 발효비료 FA와FB는 100, 150% 수준, 혼합유기질은 100%로 설정하였다. 상추 생육은 혼합유기질 빌효비료 처리량이 증가할수록FA 처리구의 엽수를 제외하고는 유의차는 없었다. 수량은 FA100, FB100 처리구가 각각 38.2, 40.8 Mg ha-1으로 혼합유기질 처리구 (38.3 Mg ha-1)와 유의한 차이는 없었다. 상추의 질소 흡수량과 이용 효율은 혼합유기질과 혼합유기질 발효비료처리구와 유의적인 차이는 없었다. 시험 후 토양 pH는 무비구를 제외하고 시험 전에 비해 다소 낮아지는 경향을보이며 처리구 중 혼합유기질 처리구의 변화가 크게 나타났다. 전기전도도, 토양유기물, 유효인산 및 치환성 양이온함량은 처리간의 유의적인 차이는 없었다. 또한 토양의 세균과 방선균 밀도는 무비구에 비해 비료 처리구가 높게나타났다. 상기 결과를 종합할 때, 제조한 혼합유기질 발효비료 2종은 혼합유기질과 대등한 양분공급 효과와 토양특성을 확인하였으며 상추 재배를 위한 아주까리유박 대체 자재로 유기재배 농가에서 활용 가능한 것으로 판단된다.
This study aimed to develop an alternative organic fertilizer to castor oil cake-based fertilizers. To assess the nutrient effect of the developed fermented mixed organic fertilizers, the yield of lettuce and soil characteristics after growth were analyzed and compared to those of a trial using a mixed expeller cake fertilizer. Two fermented mixed organic fertilizers, FA and FB, each containing 5.0% nitrogen, 2.6% phosphate, and 1.4% potassium, were produced by mixing different ratios of rice bran, dried distillers grains, sesame oil meal, and fish meal. This study was conducted with six trials: untreated, mixed expeller cake fertilizer, and the fermented mixed organic fertilizers FA and FB. Based on the amount of nitrogen fertilization (70 kg ha-1) on the lettuce, the fermented mixed organic fertilizers FA and FB were applied at 100% and 150%, respectively, and the mixed oil cake was applied at 100%. As the amount of treatment increased, there was no significant difference except the number of leaves in FA treatment. The yields from the FA100 and FB100 treatments were 38.2 and 40.8 Mg ha-1, respectively, which was not significantly different from that of the mixed expeller cake fertilizer treatment at 38.3 Mg ha-1. In addition, the nitrogen uptake and utilization efficiency of the lettuce were not significantly different between mixed expeller cake fertilizer and fermented mixed organic fertilizer treatments. Analysis of the chemical properties of the soil after the trial showed that he mixed expeller cake fertilizer treatment showed the lowest pH. There were no significant differences in electrical conductivity, content of soil organic matter, available phosphate, and exchangeable cation among the fertilizer treatments. However, the bacterial and actinomyces density was higher in the soil from the fertilizer trials than in the non-fertilizer trials. These results indicated that the two tested fermented mixed organic fertilizers had nourishing effects and soil characteristics that were similar to those of the mixed expeller cake fertilizer. Thus, farmers can use these fermented mixed organic fertilizers as alternatives to castor oil cakes for the cultivation of organic lettuce.
1. 서론
2. 재료 및 방법
3. 결과 및 고찰
4. 결론