비가림하우스에서 고랭지배추 유기재배 시 시용량 및 토양비옥도에 따른 시용질소의 이용률과 배추의 수량성을 검토하였다. 무비구에서의 구중은 사양토 토양에서 현저히 낮았으며, 비옥도가 낮은 사양토에 비해 비옥도가 높은 식양토에서 높았다. 시비량에 따른 구중의 변화는 비옥도가 높은 식양토에 비해 비옥도가 낮은 사양토에서 더 크게 나타났다. 질소이용률은 토양의 비옥도가 높고, 질소시비량이 많을수록 낮았다. 질소함량 1%의 사양토에서도 계분퇴비 2톤/10a과 표준시비량 수준의 천연무기질자재의 시용으로 질소함량 6%의 식양토의 약 90% 수준의 수량을 나타냈다. 질소, 인산, 및 칼리질 천연광물자원인 구아노, 인광석 및 황산가리고토 등은 친환경 자재로서 균형적 시비를 꾀하는 유기재배에서 널리 활용될 수 있을 것으로 보인다.
This study was carried out to evaluate nitrogen availability of applied fertilizer and to investigate yield and growth of Korean kimchi cabbage as affected by amount of fertilizer and soil fertility in organic farming applied various fertilizers in rainshelter. The head weight of Korean kimchi cabbage cultured in infertile soil (sand loam) with no amendments was very low. and that in fertile soil (clay loam) was higher than in infertile soil (sand loam). The head weight of Korean kimchi cabbage as affected by amount of fertilizer was more variable in infertile soil (sand loam) than in fertile soil (clay loam). Nitrogen availability of applied fertilizer by Korean kimchi cabbage was lower in fertile soil (clay loam) than in infertile soil (sand loam) and the lower that was, the more fertilizer applied. By application of poultry manure compost 20Mg ha-1 and natural mineral materials such as guano, phosphate rock, and potassium magnesium rock equal to amount of fertilizer recommended in conventional farming, the yield of Korean kimchi cabbage in infertile soil (sand loam) with 1% organic matter came up to 90% of the yield in fertile soil (clay loam) with 6% organic matter. Therefore natural mineral materials such as guano for N source, phosphate rock for P source, and potassium magnesium rock for K source may be able to use as environmental-friendly fertilizers in organic Korean kimchi cabbage production in highland.
