Author(s):

Harsha BR, Jagadeesh BR, Ummesalma Sanadi and Pradeep R

Abstract: The different physico-chemical properties of twenty representative black soil types spreading over seven taluks of Haveri district of Karnataka were studied during 2016-17 at UAS, Dharwad. The experimental data related to pH of the black soils varied from 7.00 to 7.85. The lowest and highest pH was obtained in Mannangi-1 and Devihosur for surface soils, respectively. The EC of the black soils varied from 0.22 to 0.35 dS m^-1. The lowest and highest EC was obtained in Bankapur-1 and Mannangi-1 soils, respectively. Organic carbon was more in Hangal soil (7.98 g kg^-1) and less in Karadagi soils (3.65 g kg^-1). The data on particle size distribution of black soil revealed that the sand content ranged from 25.53 to 43.14 per cent, silt content varied from 18.50 to 25.47 per cent and clay content varied from 37.21 to 48.89 per cent. The mean contents of sand, silt and clay were 34.07, 21.88 and 43.24 per cent, respectively. The CEC of black soils ranged from 23.64 to 46.78 cmol (p⁺) kg^-1 in surface layer. Jogihalli-4 soil recorded highest CEC while, lowest CEC was noticed in Mannangi-2 soil. The black soil EPP ranged from 4.70 to 12.36 per cent with a mean of 8.04. The PAR of black soils in surface soils ranged from 1.00 to 3.58 with a mean of 2.25. The values of sum of exchangeable cations in surface black soils varied from 21.76 to 44.41 cmol (p⁺) kg^-1. The available potassium in black soil varied from 322.56 to 752.64 kg ha^-1 in surface layer. The highest available potassium was obtained in Jogihalli-4 and corresponding lowest value in Hangal soil. These soils varied appreciably in their physico-chemical properties depending on their clay mineralogy and management practices.

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