The ameliorative effects of low-grade palygorskite on acidic soil

Yuan, Jin-Hua; E, Sheng-Zhe; Che, Zong-Xian

The ameliorative effects of low-grade palygorskite on acidic soil

2020

Yuan, Jin-Hua | E, Sheng-Zhe | Che, Zong-Xian

Mineral composition and alkaline properties of palygorskite (Pal), and its ameliorative effects on chemical properties of acid soil were investigated. Dolomite was the main form of alkali in Pal and the acid neutralisation capacity of Pal was 215 cmol kg-1. Incubation experiments indicated that Pal incorporation increased soil pH, cation exchange capacity, base saturation and exchangeable K+, Na+, Ca2+ and Mg2+ contents, and decreased the levels of exchangeable H+, Al3+ and acidity, over a 1-year period. The ameliorative mechanisms were the dissolution of major alkaline matter in Pal (i.e. dolomite), and the exchange between released Ca2+ and Mg2+ with H+ in acidic soil. Hence, Pal can be used as a moderate acidic soil amendment.

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