MICRONUTRIENT FERTILITY MAP OF GHATAPRABHA COMMAND AREA OF BELGAUM DISTRICT
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Date
1996
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University of Agricultural Sciences, Bangalore
Abstract
Studies on status of micronutrient cations and response of maize to zinc and iron levels in red soil of Ghataprabha command area of Belgaum district of North Karnataka revealed that the soils in different taluks namely Gokak, Raibag, Chikkodi, Athani and Hukkeri, these soils are alkaline in soil reaction and normal in electrical conductivity. The range and mean values of available iron, manganese, copper and zinc in soils of Ghataprabha command area of Belgaum district vary from 0.32 to 11.02, 0.37 to 27.73, 0.54 to 8.28 and 0.03 to 3.88 ppm with a mean value of 3.77, 8.00, 2.54 and 0.51 ppm respectively. As per the limits of <2.5, 2.5 to 4.5 and >4.5 ppm as deficient, marginal and sufficient in available iron, 21.1, 52.0 and 26.9 per cent of samples fall under deficientmarginal and sufficient category respectively. In respect of available manganese, majority of the soil samples (97.1%) fall under category of sufficient (>2.0 ppm) and reamaining (2.9%) samples fall under deficient category (<2.0 ppm). As per deficiency (<0.2 ppm) and sufficient (>0.2 ppm) category for available copper, all the soils of Ghataprabha command area of Belgaum district fall under sufficient category. In case of zinc. 76.9, 9.1 and 14.0 per cent of samples fall underdeficiency (<0.6 ppm), marginal (0.6-1.0 ppm) and sufficient (>1.0 ppm) category respectively. The response of maize to zinc and iron in red soil of command area used for pot culture having high and marginal in available zinc and iron, indicated that there was no significant increase in dry matter production, but showed significant increase in concentration of the nutrients.
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No. of references 115