An experiment on the enhancement of the fertility of rice paddy. Effcet of field soil application on the fertility of rice paddy

답지력증진시험(畓地力增進試驗) (객토(客土)가 답지력(沓地力)에 미치는 영향(影響))

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 kg, 22,500 kg, 30,000 kg, and 7,500 kg 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 kg was highly significant, and those of 22,500 kg and 30,000 kg significant, where as that of 7,500 kg was non-significant compared with the control. 5. It seems that the most effective amount of application is 15,000 kg/10 a in this experiment. 6. The infection rate of rice blast and neck rot decreased with the increased amount of application.

1. 본시험(本試驗)은 산적토객토(山赤土客土)가 척박한 답토양(畓土壤)의 지력(地力)을 증진(增進)시키는데 그 효과여부(?果與否)를 구명(究明)코져 실시(實施)하였으며 충북도객토사업(忠北道客土事業)과 관련(關聯)된 시험(試驗)이다. 2. 객토재료(客土材料)는 충북대학산야적색토(忠北大學山野赤色土)로서 활성철(活性鐵) 1.31%를 함유(含有)하고 있다. 3. 정조중(精粗重)으로 15,000 kg/10 a 구(區)에서는 11%의 증수(增收)를 갖어왔고 22.5000 구(區)는 9%, 30,000 kg 구(區)는 8%, 7,500 kg 구(區)에서는 6%의 증수(增收)를 갖어왔다. 4. 객토구간(客土區間)에서는 5%수준(水準)에서 유의차(有意差)가 인정(認定)되지 않으나 무객토구(無客土區)와 15,000 kg 구(區)사이에서는 매우 유의적(有意的)이고 22.500 kg 구(區)와 30,000 kg 구(區)는 유의적(有意的)이며 7,500 kg 구(區)와는 유의차(有意差)를 인정(認定)할 수 없다. 5. 본시험(本試驗)에서 가장 효과적(?果的)인 객토량(客土量)은 10 a 당(當) 15,000 kg 라고 본다. 6. 동려병과 수수 도열병의 이환율(罹患率)은 객토량(客土量)의 증가(增加)에 따라 감소(減少)되고 있다.