Effect of Potassium on Rice Plant Growth on an Akiochi Soil

추락답토양(秋落沓土壤)에 생육(生育)한 수도(水稻)에 대(對)한 가리(加里)의 효과

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


In application of manganese and silica to Akiochi soil, growth of rice plant with potassium was remarkably increased, but the growth without potassium was stunted and the number of the tiller was relatively reduced in comparison with that receiving potassium. The minus potassium plant developed tiny brown spots on the leaves and color of the leaves was dark green. They had smaller leaves and shorter stem while heading advanced. Roots with potassium were long and thick, and new ones developed, while roots without K were very poor, the branch and hair roots very thin, and severe root rot was observed. With minus potassium treatment, the root rot of Jin Heung(commercial variety) was more severe than Nonglim 6(Akiochi resistant). Growth of plant without potassium was very poor, and potassium content of the plant was very low, while nitrogen, phosphorus, silica, iron and manganese contents were higher than potassium supplied plant. Application of $Mn+SiO_2$ to Akiochi soil lowered iron content of plant, and iron content of the plant were also reduced by application of potassium. From the results obtained it can be concluded that root damage of minus potassium plant grown in Akiochi soil supplied $Mn+SiO_2$ was caused by potassium deficiency. Potassium, and $Mn+SiO_2$ applications lowered iron content in the plant grown on Akiochi soil.