【摘 要】
：
The soil fertility in farms was reduced by using a large amount of chemical fertilizers and pesticides from 1965s in Japan.Thereafter, organic matter such as compost or manure are used in combination
【机 构】
：
Graduate School of agriculture,Iwate University F
【出 处】
：
The Second Asian Horticultural Congress(第二届亚洲园艺大会)
论文部分内容阅读
The soil fertility in farms was reduced by using a large amount of chemical fertilizers and pesticides from 1965s in Japan.Thereafter, organic matter such as compost or manure are used in combination with chemical fertilizer for keeping soil in good condition.
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