1. This experiment was carried out, as part of virgin soil application project conducted by Chung Buk Province in 1966, to determine the effect of application of field red soil to rice paddy for enhancing the fertility of sterile paddy soil.
2. This applied field soil from the mountain near Chung Buk College contains 1.31% of active iron.
3. The plots of 15.000 ㎏, 22,500 ㎏, 30,000 ㎏, and 7,500 ㎏ had increased yields of 11%, 9%, 8%, and 6% in weight of unhulled rice, respectively.
4. Although any significance was not recognized among the levels of treatment at 5% level in F test, the plot of 15,000 ㎏ was highly significant, and those of 22,500 ㎏ and 30,000 ㎏ significant where as that of 7,500 ㎏ was non-significant compared with the control.
5. It seems that the most effective amount of application is 15,000 ㎏/10 a in this experiment.
6. The infection rate of rice blast and neck rot decreased with the increased amount of application.
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