Investigation of Available Silicon Content in Cultivated Soil in Jiangxi Province

The available silicon content of 497 farmland soil samples developed from ten main parent materials in Jiangxi was determined. The results indicated that available silicon content of cultivated soil averaged 60.0mg/kg, and there were 83.5% of total soil samples whose SiO\-2 content was less than 100mg/kg,and 64.4% of total soil samples whose SiO\-2 content was less than 50 mg/kg. The area of silicon deficiency made up 91.5% of total paddy soil. Regional distribution characteristic of soil available silicon content was low in south,high in north,low in east and high in west. There was a close relationship between soil available silicon content and parent materials or cropping pattern,a significant positive correlation between soil available silicon content and pH or organic matter of soil, but not correlation between soil available silicon content and soil total N, available N,available P or available K content.\;