pH Dependence on EC in Soils Amended with Fertilizer and Organic Materials and in Soil of Plastic Film House

비료와 퇴구비를 처리한 토양과 시설재배지 토양에서 토양의 EC에 따른 pH변화

  • Kim, Yoo-Hak (National Institute of Agricultural Science and Technology) ;
  • Kim, Myeong-Sook (National Institute of Agricultural Science and Technology) ;
  • Kwak, Han-Kang (National Institute of Agricultural Science and Technology)
  • Received : 2005.09.01
  • Accepted : 2005.10.05
  • Published : 2005.10.30

Abstract

Soil pH is an intensity factor of releasing hydrogen ion which is buffered by aluminum. It depends on pH buffer capacity of Al whether soil pH is governed directly by cations or not. A study was conducted to elucidate the pattern of pH changes by soil EC. Fertilizer and three kinds of organic manures composed of cow and pig and fowl dropping and one kind of rice straw compost were added independently into upland sandy loam soil. This treated soils and four upland soils under plastic film house having different levels in electrical conductivity (EC) were incubated with field capacity at $30^{\circ}C$ for 5, 10, 20 and 40 days. Soil pH varied directly as the cations contained in organic materials according to degree of saturating pH buffer capacity (pBC) of sandy loam soil. pH of the soils under plastic film house was lowered by soil EC due to governing by overplus of cation beyond pBC.

Keywords

Soil pH;Cation;Electrical conductivity

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