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Loss of K-Bearing Clay Minerals in Flood-Irrigated, Rice-Growing Soils in Jiangxi Province, China

Published online by Cambridge University Press:  01 January 2024

Zhongpei Li ,
B. Velde  and
Decheng Li
Zhongpei Li
Affiliation:
Institute of Soil Science, Chinese Academy of Sciences, 71 Beijing East Road, 210008, Nanjing, China
B. Velde*
Affiliation:
Laboratoire de Géologie, CNRS 2113 Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris, France
Decheng Li
Affiliation:
Institute of Soil Science, Chinese Academy of Sciences, 71 Beijing East Road, 210008, Nanjing, China Laboratoire de Géologie, CNRS 2113 Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris, France
*
*E-mail address of corresponding author: papa@geologie.ens.fr
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Abstract

The loss of K-bearing clay minerals has been observed over an 80 y cultivation period in Chinese rice paddies despite the use of NKP fertilizers. Clay mineral determinations were made in flood-irrigated paddies cultivated for 3, 10, 15, 30 and 80 y in clayey (45 wt.%), red soils derived from red Quaternary sediments. Three clay minerals are initially present in these soils: illite-mica, magnesian chlorite and an interstratified mica-aluminous chlorite mineral. This last phase was identified using computer simulations. The K-bearing phases (discrete mica and illite as well as interstratified mica layers) are to a large extent lost while the Fe content decreases in the soil as a whole and increases in the chlorite. The mica component in the mixed-layer mineral decreases also. These changes in clay mineralogy and relative abundance suggest a loss of potassic minerals and an increase in the formation of less siliceous, more ferro-magnesian chlorite. These changes occur over 30 y or less, a rather rapid, irreversible transformation of soil clay minerals. Such loss of potassic minerals renders the cultivation more dependent on fertilizer amendment.

Keywords

Clay MineralIrrigationMica-chlorite InterlayerPotassium
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 1 , February 2003 , pp. 75 - 82
Copyright
Copyright © 2003, The Clay Minerals Society

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