토양의 질산태 질소와 수량과의 관계를 통한 오이의 질소 시비량 설정
Recommendation of Nitrogen Fertilization for Cucumber from Relationship between Soil Nitrate Nitrogen and Yield
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초록
토양의 질산태 질소를 이용하여 시설 오이의 적정 질소 시비량을 결정하고자 질산태 질소 함량이 67-343 mg/kg의 범위를 갖는 8곳의 시설재배 토양으로부터 오이를 공시작물로 표준시비구와 무시비구에 대한 생산력 검정시험을 포트 재배로 조사하였다. 오이의 수량은 최소 1,006 g/plant에서 최대 2,369 g/plant로 토양 질소함량 수준에 따라 다양한 생산능력의 차이를 보였다. 토양의 질산태 질소는 Agronomic efficiency(AE)과 N use efficiency(NUE)와는 부의 상관을 보였다. 질소 무비 재배를 위한 시험 전 토양의 질산태 질소 임계기준은 토양의 질산태 질소 함량에 대한 AE 및 NUE의 관계를 Cate-Nelson 일원분류의 분산분석법으로 비교하고 또한 무비구의 수량 및 지상부의 질소 흡수량과의 관계로부터 추정하였을 때 약 260 mg/kg으로 나타났다. 질소 표준 시비가 요구되는 시험 전 토양의 질산태 질소 임계기준은 70 mg/kg 으로 추정되었다. 질산태 질소 함량이 70-260 mg/kg 범위의 토양에서는 Y= -1.032Ｘ + 269.2(Y: 질소시비량, kg/ha; Ｘ: 시험 전 토양의 질산태 질소 함량, mg/kg) 추천식으로 질소시비량을 결정할 수 있다.
Abstract
This study was carried out to establish the reasonable level of nitrogen (N) fertilization based on soil nitrate nitrogen (NO3-N) content for cucumber (Cucumis sativus L.) under plastic film house. Cucumber plants were cultivated with standard and free N fertilization in eight soils which had various amounts of NO3-N ranging from 67 to 343 mg/kg. The yield of cucumber was in the range of 1006 to 2369 g/plant, depending on the nitrogen supplying capability of soils. The amount of NO3-N in the soil was negatively correlated with agronomic efficiency (AE) and N use efficiency (NUE). The critical level of soil NO3-N content for cucumber in N free fertilization was found to be about 260 mg/kg in Cate-Nelson analysis of variance between soil NO3-N and AE or NUE. Also the same critical soil NO3-N content was found in the yield and amount of N uptake of cucumber under N free fertilization. A standard N fertilization was required when soil NO3-N content was below 70 mg/kg. The optimal application rate of N fertilizer for cucumber in the soils containing NO3-N between 260-70 mg/kg could be recommended by the equation Y=-1.032X+ 269.2 (Y: N fertilization rate, kg/ha; Ｘ: soil NO3-N content, mg/kg).
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