Zinc deficiency disorder occurs in calcareous soils with pH more than 7.4. This adverse effect is due to the inter action ot soil pH and CaCo, with zinc compounds in the soil. The zinc content of calcareous soils is not of ten low but may exceed the amount that is present in non-calcareous soils (Thorne, 1942). Moreover, the distribution of Zn in soil is likely to be affected by depth of the soil, pH, CaCO., organic matter and CEC. Miller et al. (1964) observed that Zn deficiencica aro common in plante grown under alkaline soil conditions. In addition, Udo et al. (1970), Trehan and Sekhon (1977) and Saeed (1977) have reported that in calcareous soils Zn mav be adsorbed by CaCo,.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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