The Effect of Wollastonite and Manganese Dioxide on Rice Grown on a Flooded Acid Sulfate Soil

특이산성토(特異酸性土)(답(沓))에 생육(生育)한 수도(水稻)에 대(對)한 규회석(珪灰石) 및 MnO2의 효과

  • Park, Y.D. (Institute of Plant Environment, Office of Rural Development) ;
  • Kim, Y.S. (Institute of Plant Environment, Office of Rural Development)
  • 박영대 (농촌진흥청 식물환경연구소) ;
  • 김영섭 (농촌진흥청 식물환경연구소)
  • Published : 1970.04.30


The effect of wollastonite and manganese dioxide on the growth of rice on an acid sulfate soil were investigated in pot experiment. 1. Since aluminum content in the leachate of soil was reduced with increasing the pH and these chemical changes in the leachate were more pronounced by applying wollastonite, aluminum toxicity in flooded paddy rice was overcome by applying wollastonite, or flooding. 2. Poor growth of rice with iron toxicity-like symptoms on the untreated acid sulfate soil may be caused by excess iron and sulfur. Plants applied wollastonite, however, grew normally and did not show any symptoms. Iron and sulfur contents in the plant was reduced by applying wollastonite. 3. Because of the iron content in the both leachate and plant can be lowered by applying wollastonite, iron-toxicity was averted by applying the wollastonite. 4. Application of manganese dioxide in combination with wollastonite did not counteracted iron content in the plant as compared with the wollastonite treatment. 5. The application of wollastonite increased the dry weight of straw and grain yield. Manganese dioxide with wollastonite caused the increase of number of spickelets per panicles and ripened grains as compared with wollastonite. 6. From these results it can be concluded that the major cause of the poor growth of rice on acid sulfate soil is iron toxicity and the Fe-toxicity can be reduced by application of wollastonite.