In soybean cultivation, fertilizer application is in a dilemma between more nitrogen supply suppresses the nitrogen fixation of root nodules, and nitrogen deficiency at the early stage causes the shortage of vegetable growth. Compost fertilizer is considered that release the nitrogen gradually in a long period. The objective of this experiment was to determine the effect of thermophile garbage compost on the growth and the seed yield of soybean and the nutrient leaching losses from the soil by the comparison with chemical fertilizer. Thermophile garbage compost was applied in the pots and the field before sowing of soybean. The amounts of compost application were adjusted as it contained the same (1-T),2-times(2-T), and 10 times (10-T) of total nitrogen compared with that of chemical fertilizer. The NO3-N and potassium learched from the soil were significantly lower in 1-T and 2-T, and about same even in 10-T, compared with that of chemical fertilizer applied soil. However, the compost aplication had no effect on the learching of phosphorus and the total EC. Soybesn plant growth was not affected by the compost application until the flowering stage. However, the pod number, seed number and seed weight increased in 1-T and 10-T at harvest time. This effect is suggested that compost fertilizer could supply the nitrogen to the plants especially at the late growth stage. From the above results, it is considered that thermophile garbage compost is not only effective for preventing the nutrient learching but also suitable as a fertilizer in soybean cultivation.
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