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KMID : 0903520010440020092
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
2001 Volume.44 No. 2 p.92 ~ p.96
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Physical - chemical Properties and Phosphorus Adsorption Characteristics of Soils in Baicheng , China
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Abstract
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Soil physical-chemical properties and phosphorous adsorption characteristics were investigated to obtain the informations of the appropriate fertilization and soil management in Baicheng region, China, where agricultural circumstances at present forces to consider the use of land for crop production. Soils were collected from one uncultivated and three cultivated lands on August 1993. Soil pH was very higher in uncultivated land than in cultivated land, their values were 10.2 and 7.4, respectively. Regardless of cultivation, soil organic matter contents were below 2%, and concentrations of available soil phosphorus expressed as Bray I P and Olson P were less than 10 ㎎ P ㎏^(-1), however, canon exchange capacity was higher than 20 c㏖(+) ㎏^(-1). For uncultivated soil, the values of exchangeable sodium percent and calcium saturation percent were higher than 100%. The major canon of soil saturation paste extracts was Na regardless of land use type. Based on electrical conductivity and sodium adsorption ratio of saturation paste extracts, uncultivated soil was classified as saline-sodic soil and cultivated soil was classified as sodic or normal soil. The maximum adsorption capacity of phosphorus calculated by Langmuir isotherm ranged from 406 to 521 ㎎ P.㎏^(-1). The constraints of soils in Baicheng regions for agricultural crops were high salt concentration, unfavorable soil chemical composition such as low concentration of available phosphorous, and poor drainage due to soil dispersion by high Na concentration. Therefore, the soil in Baicheng region, need the application of phosphorus fertilizer to increase the soil fertility and the proper soil management to improve the soil physical property especially permeability and soil structure.
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