AbstractAn aqueous grass extract was allowed to react with powdered limestone rock under controlled laboratory conditions at room temperature. The solution mobilised iron from limestone, in amount about 100 times that released by carbonic acid leaching. It is suggested that the action of the aqueous extract of grass coupled with that of carbonic acid liberated by the ample amount of rainfall accounts for the release and mobilisation of iron oxide which results in the formation of red‐brown soil on limeston
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