Rock Phosphate with Mycorrhizae as P Source for Tomato Plant in Volcanic Ash Soil

화산회토양에서 Arbuscular Mycorrhizae 에 의한 토마토의 인광석 이용

  • Chung, Jong-Bae (Dept. of Agricultural Chemistry, Taegu University) ;
  • Moon, Doo-Khil (Faculty of Horticultural Life Science, Cheju National University)
  • 정종배 (대구대학교 자연자원대학 농화학과) ;
  • 문두길 (제주대학교 농과대학 원예생명과학부)
  • Published : 1999.09.30

Abstract

In order to examine the possible use of rock phosphate as P source, tomato seedlings with or without inoculation of arbuscular mycorrhizal fungi were grown in the pots of sterile volcanic ash soil from Cheju island with two levels of phosphorus (100 and 200 mg/kg) supplied either as fused or as rock phosphate. After three months of culture, plant dry weight, P and other nutrient uptake, root colonization and spore density in the soil were determined. Treatments of rock phosphate of both levels resulted in the significantly depressed plant growth in comparison to the treatments of fused phosphate, likely due to lower P availability in soil with rock phosphate. Mycorrhizal fungi inoculation increased the dry weight of plant at 200 mg/kg level of both fused and rock phosphate. Root infection and sporoulation were reduced in rock phosphate treatments. Nitrogen, K, Ca and Mg contents in plants were not significantly different at all treatments. As a P source, rock phosphate in combination with mycorrhizae was not satisfactory for optimum plant growth at $100{\sim}200\;mg/kg$ levels in Cheju volcanic ash soil.