The calcified paddy soil induced by long time overliming is a poor agricultural soil in Southern China. Contrary to the usual soil types in this area which use to have a narrow Ca/Mg ratio in their carbonate salts, the calcified paddy soil contains mainly calcium carbonate in its accumulated salts. The accumulation of calcium carbonate increases with the decrease of depth in soil profile.
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龚子同,陈志诚.华南石灰化水稻土的特性及其形成过程[J].土壤学报,1963,11(1):92-98. T. T. KUNG, T. C. CHEN. ON THE CHARACTERICTICS AND FORMATION OF CALClFIED PADDY SOIL IN SOUTH CHINA[J]. Acta Pedologica Sinica,1963,11(1):92-98.