The present paper deals with the conception, character and evolution of tilth of paddy soil in China. According to physical, chemical and micromorphologieal stndiea, ten tilth types of paddy soil was divided. It is considered that the tilth of paddy soil may be used as the basis on which the soil species are classified.
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龚子同.水稻土的耕性及其在土壤分类上的意义[J].土壤学报,1979,16(2):85-93. Gong Zi-tong. TILTH OF PADDY SOIL AND ITS SIGNIFICANCE ON SOIL CLASSIFICATION[J]. Acta Pedologica Sinica,1979,16(2):85-93.