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M.V. REKHA, S. KIRAN KUMAR, S. ASHOK, S. ALUR, M.S. NAGARAJA* AND R. SUMA
Department of Soil Science and Agricultural Chemistry, University of Horticultural Sciences,Bagalkot – 587 104, Karnataka, India
Micronutrient availability is very sensitive to changes in soil environment as influenced by water and nutrient management practices. Surface soil samples representing, areas irrigated with different water sources were analysed for DTPA extractable micronutrients, pH and free CaCO3. DTPA–extractable micronutrients varied significantly among soils with different irrigation sources. All the micronutrients indicated negative correlations with soil pH and CaCO3 content but the free CaCO3 and soil pH showed positive relationship among themselves. The soil micronutrients were found to be significantly higher in stream (lift) water irrigated soils followed by borewell water irrigated soils. However, the least availability was observed in soils with no irrigations. Frequent irrigations for sugarcane in stream irrigated areas resulted in loss of CaCO3 and reduction in soil pH, which might have contributed for higher micronutrient availability.
Black soil, Borewell irrigation, Dryland, Irrigation sources, Soil Micronutrients