As one of the measures to fine a way to improve the fertilization efficiency based on soil quality in Jeju Island's tea garden, we investigated the leaching volume of nitrogen constituents included in the fertilizer between the clay loam soil ("A testing soil") and the gravel soil (66% of gravels, "B testing soil"). The leaching water volume to the subterranean water enlarged when the rainfall increased. The leaching water volume in B testing soil occupied 67% of the rainfall (vs. 55% in A testing soil). B testing soil's annual leaching volume of nitrogen constituents in heavy fertilization (90kgN/10a) recorded 45.7kgN/10a, which was larger than 38.25kgN/10a of A testing soil. The leaching volume of nitrogen constituents was the largest in heavy fertilization of both testing soils, followed by slow-releasing fertilizer, 30% reduced fertilization, 50% reduced fertilization. The yield of first crop of tea was smaller in B testing soil which had larger leaching volume of nitrogen constituents than A testing soil. In addition, the chemical leaf contents such as T-N and amino acids - which set the quality of tea leaf - were similar in both testing soils.
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