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VERTICAL DISTRIBUTION OF DTPA-EXTRACTABLE MICRONUTRIENTS IN SOILS OF CUMBUM VALLEY, TAMIL NADU

Article Id: ARCC1390 | Page : 79- 84
Citation :- VERTICAL DISTRIBUTION OF DTPA-EXTRACTABLE MICRONUTRIENTS IN SOILS OF CUMBUM VALLEY, TAMIL NADU.Agricultural Science Digest.2010.(30):79- 84
T. Alagu Nagendran* and A. Angayarkanni
Address : Department of Soil Science, Faculty of Agriculture, Annamalai University, Annamalainagar- 608 002, India

Abstract

Fifty six soil samples from sixteen pedons in two transects representing various
physiographic positions along a double toposequence of Cumbum valley of Tamil Nadu were
studied for vertical distribution of DTPA extractable iron, manganese, zinc and copper and their
relationship with some soil properties. Soil reaction (pH), free calcium carbonate, organic carbon
and particle size fractions had strong influence on the distribution pattern of these micronutrients
in the profile. The content of micronutrients increased with the increase in organic carbon and
decreased with increase in pH and free CaCO3. In general, all these micronutrients decreased
with increase in depth but they had no definite correlation with topography. As per the critical
limit suggested for Tamil Nadu soils, Iron and Manganese were found to be sufficient in most
soils except calcareous and recent alluvial soils. Zinc and copper were deficient uniformly in all
soils. Site- specific residual copper accumulation was also found.

Keywords

DTPA extractable cations Toposequence Red and alluvial soils Critical limit

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