Saturday, 15 July 2006

Available Micronutrients Status in the Traditional Arecanut Growing Soils of Karnataka.

Vishwanath Shetty, C. Narayanaswamy, H.V. Rudramurthy, T.S. Vageesh, and M. Hegde. College of Agriculture and Zonal Agricultural Research Station, Bangalore, India

A soil survey was conducted in traditional arecanut growing areas viz., Thirthahalli, Koppa, Sringeri and Sagar taluks of Karnataka. Eighty surface soil (0-20 cm) samples, 20 from each area were collected, processed and analysed for pH, EC, SOC, available phosphorus, available potassium and DTPA extractable micronutrients. Soil analytical data indicated that soils were highly acidic to moderately acidic. Majority of soils were medium to high in soil organic carbon, available potassium and available phosphorus, and no soil samples were deficient in available micronutrients status. Mean values indicated that the soils from Thirthahalli, area recorded the highest (86.3, 58.5 and 19.3 mg kg-1 soil) available iron, manganese and copper content respectively, while the soils from Sagar area recorded the lowest (3.7, 50.7 and 15.1 mg kg-1 soil) available zinc, manganese and copper content respectively. Whereas the soils from Sringeri area recorded the lowest (67.4 mg kg-1 soil) available iron and the highest (4.7 mg kg-1 soil) available zinc content. Statistical analysis indicated that pH was negatively and significantly correlated with iron (-0.320**) and copper (-0.297*), while soil organic carbon was positively and significantly correlated with iron (0.297*), manganese (0.342**), copper (0.351**) and zinc (0.310**). Both the available phosphorus and potassium were positively and significantly correlated with iron (0.390 ** and 0.289 *) and manganese (0.287 * and 0.315**).

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