Alleviation of Subsoil Acidity of Red Soil in Southeast China with Lime and Gypsum *1English Full Text
SUN BO 1, R. MOREAU 2, R. POSS 2, J. PITARD 2, A. AVENTURIER 3, P. FALLAVIER 3 and ZHOU SHENGLU 1 1 Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008 (China) 2 ORSTOM, 911, avenue Agropolis
Abstract: Application of lime or gypsum is a common agricultural practice to ameliorate soils with low pH which prohibits crop production. Its integrated effect on soil properties in a red soil derived from Quaternary red clay in Southeast China is discussed in this paper. Application of gypsum in the topsoil without leaching raised soil pH and promoted the production of soil NH 4, but lime addition had a contrary effect. Generally, application of lime and/or gypsum has little effect on soil electrical properties. Gypsum had a little effect on soil exchange complex and its effect went down to 30 cm in depth. The effect of lime reached only to 5 cm below its application layer. With leaching, Ca transferred from top soil to subsoil and decreased exchangeable Al in subsoil. Gypsum application led to a sharp decrease in soil exchangeable Mg but had no effect on K.
Keywords：
- Series：
(D) Agriculture; (A) Mathematics/ Physics/ Mechanics/ Astronomy
- Subject：
Physical Geography and Topography; Fundamental Science of Agriculture; Agronomy
- Classification Code：
S155.25,S153.4
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