중량식 라이시미터에서 콩 재배시 물관리 방법에 의한 양분의 용탈과 작물 흡수
Nutrient Leaching and Crop Uptake in Weighing Lysimeter Planted with Soybean as Affected by Water Management
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참고문헌
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초록
본 연구는 기상 조건 및 관개 여부가 양분용탈 및 콩의 양분 흡수에 영향을 미치는지 평가하기 위하여 중량식 라이시미터에서 2015년부터 2016년까지 콩을 재배한 결과를 제시하였다. 콩 재배기간인 6월부터 10월까지의 증발산량은 무관개구의 경우 강우에 따라 변동되었으며, 2016년 7월 중순부터 8월 말까지 지온상승 및 강우 빈도의 감소로 증발산량이감소하다가 9월 중순 강우에 의해 유효수분 함량을 회복하여생육 후기에 증발산량이 증가하였다. 질산태질소의 지하 용탈량은 2016년 7월 초 5일간 강우가 지속되었을 때 가장 많았으며, 그동안 지하배수가 거의 없었던 무관개구에서 더 높게나타났다. 개화기 및 착협기인 7월 중순부터 8월까지 한발로인하여 무관개구의 토양 수분함량은 7월 초의 50% 수준으로유지되었으며, 콩 수량은 적습관개구의 25% 수준이었다. 적습관개구와 무관개구의 양분 흡수량을 비교한 결과 질소 흡수량이 적습관개구에서 20~50% 더 높았으며, 인산, 칼리 흡수량 차이는 미미하였다. 토양 수분함량은 콩의 질소 흡수에영향을 미치며, 적정 수량을 생산하기 위해서는 관개를 통한적정 수분 공급이 필수적이었다.
Abstract
BACKGROUND: Soil water content strongly depends on weather condition and irrigation, and it could influence on crop nutrient use efficiency. This study was performed to assess nutrient uptake of soybean by soil water condition. METHODS AND RESULTS: In this study, nutrient leaching and crop uptake as affacted bywatermanagement practice was investigated using weighing lysimeter which is located in National institute of agricultural science, Wanju, Jeonbuk province fromJune 2015 toOctober 2016. Water supply for soybean (cv. Daewon)wasmanagedwith irrigation and rainfall. Nitrate leaching was greatest in the rainfall treatment at early July 2016.Yield of soybean in the rainfall treatment was only 25%compared to the irrigation due to the drought at flowering and podding period. The uptake of nitrogen was considerably reduced by drought whereas the uptake of phosphorus and potassium was less affected by drought. CONCLUSION: It was proven that nitrogen loss and uptake were dependent on soil water condition. Therefore, irrigation water management to maintain available soil moisture capacity is critical to nitrogen uptake and yield of soybean.
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