Analysis of soil samples from different cardamom-growing areas of Kerala have shown that majority of them are acidic, the pH being in the range of 5—5.5 (Zachariah, 1975). Nair et al. (1975) reported that pH of soils in three important cardamom-growing districts in Kerala viz., Idukki, Wynad and Palghat, ranged from 4.7 to 6.15, 4.75 to 5.2 and 5.5 to 5.8 respectively and there was a slight variation in the pH with depth of soil, the surface layer having higher pH in most of the cases. Ranganathan and Natesan (1985) reported that pH of cardamom-growing soils of Karnataka was higher (5.8—6.5) than that of Kerala soils. Soils of cardamom-growing areas of Tamil Nadu have pH ranging from 4.7 to 7 (Vadiraj et al, 1998).
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