Effects of Red Earth Addition on Soil Properties and Rice Yields

사질답(砂質畓)에서 객토원별(客土源別) 객토량(客土量)이 토양(土壤) 및 수도수량(水稻收量)에 미치는 영향(影響)

  • Published : 1985.06.25


This study was conducted to evaluate the effects of red earth addition in sandy loam paddies. Clay contents of the red earths were 19% (loam) and 35% (clay loam). The treatments were 3 levels of red earth and 2 levels of fertilizer. The results were summerized as follows: 1. Water decrease rate was lowered with the increase of clay by the red earth application in sandy loam paddies. 2. Red earth addition increased CEC and available $SiO_2$ in sandy loam, and integrated soil improvement showed higher pH and lower Eh than standard fertilizer application. 3. Rice yields in the red earth addition of loam were decreased by 2-3% at standard fertilizer application and increased by 2-4% at integrated soil improvement. Otherwise, rice yields in the red earth application of clay loam were increased by 1-4% at standard fertilizer application and 3-8% at integrated soil improvement.