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Proceedings of the International Academy of Ecology and Environmental Sciences, 2014, 4(2): 81-94
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Article

Spatial distribution of macronutrients in soils of Markandeya river basin, Belgaum(d), Karnataka(s), India

P. Ravikumar , R. K. Somashekar
Department of Environmental Science, Bangalore University, Bangalore - 560056, India

Received 2 April 2014;Accepted 14 April 2014;Published online 1 June 2014
IAEES

Abstract
Markandeya River basin stretches geographically from 15o56' to 16o08' N latitude and 74o37' to 74o58' E longitude, positioned in the midst of Belgaum district in the northern part of Karnataka state. Spatial distributions for twenty different soil quality characteristics were analyzed in the soil samples collected from 30 selected agricultural fields in the study area. Nutrient index reflected the nutrient status of soil and hence it was calculated by using already determined chemical parameters like organic C, available N, available phosphorus, and available potash. The present study revealed that there is not much variation in soil fertility status of soils developed on various landforms in the area. The soils had variable organic matter content and decomposition rates accounting to 0.06 to 1.5 % of organic carbon. Further, it is evident that all the soil samples were having low available nitrogen (29.1-189.5 Kg/ha) content, 50% of the samples has low to medium available P (0.96 to 15.1 Kg/ha) and 90% of the samples showed adequate supply of available potash (313.3-1500.8 Kg/ha). Sodium Absorption Ratio (SAR) and Exchangeable Sodium Percentage (ESP) indicated that the soils were excellent for irrigation.

Keywords Markandeya river basin;nutrient index;salt index;soil reaction index;organic carbon.


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