경사도와 축분 부산물비료 시용에 따른 고랭지 밭의 양분 유실량 = Assessment of Nutrient Losses in Different Slope Highland Soils Amended with Livestock Manure Compost

다국어 초록 (Multilingual Abstract)

Soil fertility of alpine soils in Gangwon-Do has been deteriorating because of heavy input of chemical fertilizers for intensive crop production. To reduce application of chemical fertilizers, use of livestock manure compost in alpine soils increases consistently. Soil loss and runoff due to heavy rainfall in alpine area cause nutrient loss from soil, and subsequently pollute stream water. Therefore, the objective of this study was to assess nutrient efficiency and loss in Chinese cabbage cultivated soil with different livestock manure composts in several slopes. As control, chemical fertilizer was applied at the rate of 250-78-168 kg ha^-1 for N-P_2O_5-K_2O. Each pigand chicken manure compost was applied at the rate of 10 MT ha^-1. Chemical fertilizer + chicken manure compost was applied as same rate. Four treatments was practiced in 5, 20, and 35% filed slopes, respectively.
We monitored the amounts of soil loss and runoff water after rainfalls, and we also analyzed the contents of nutrients in soil and runoff water through lysimeter installed in alpine agricultural institute in Gangwon-Do.
T-N loss due to soil loss was much greater with increasing filed slops rather than different fertilizer treatments.
T-N loss has positive relationship with field slopes, which showing soil loss (MT/ha) = 1.66 slopes (%) - 3.5(r^2 = 0.99). Available phosphate and exchangeable cations showed similar tendency with increasing slopes.
T-N and T-P losses caused by runoff water were highest in chemical fertilizer (NPK) + chicken manure compost treated plot, while lowest in chemical fertilizer treatment. T-N contents (2.13, 1.95%) in chinese cabbage treated either pig and chicken manure composts compared to that (2.65%) of chemical fertilizer were significantly less. This could be resulted from much greater T-N loss in soil treated with pig and chicken manure composts.

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