Effect of Urea and Ammonium Nitrate Application on the Use of Soil Born Potash and Yield of Chinese Cabbage

요소(尿素)와 질산(窒酸)암모늄(질안(窒安))의 시용(施用)이 토양가리(土壤加里)의 이용(利用) 및 배추의 수량(收量)에 준 영향(影響)

  • Published : 1985.06.25


A pot experiment was conducted to study the effect of urea and ammonium nitrate on the use of soil born potassium and the yield of chinese cabbage (Brassica pekinensis, Var. Heungnong, Seoul). Results obtained are shown as follows; 1. In comparison with urea, ammonium nitrate lowered soil pH and promoted the utility of soil born potash by chinese cabbage which resulted in the increase of the yield at no potash applied cultivation. 2. Ammonium nitrate seemed to be more effective than urea on the growth of the edible part of chinese cabbage (inner leaves of cabbage) and the effect was much promoted by the addition of potash. 3. The greater the yield of edible part of cabbage, the lower the N/K ratio of dry mater. The highest yield was obtained at N/K ratio of 1.4 in 1.2-1.3 m.e/g K range of the dried cabbage.