National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Potassium an important major nutrient exists in soil as different forms and these forms are in a state of quasi-equilibrium with each other. These different forms of potassium and their distribution were studied in twenty representative red and black soil types spreading over seven taluks of Haveri district of Karnataka. Soils were generally sandy clay loam to clay in texture. The soil reaction ranged between slightly acidic and near neutral in reaction and electrical conductivity was well within the permissible limit. The organic carbon content was low to medium. The average CEC, potassium adsorption ratio, sum of exchangeable cations and available potassium of black soils was high compared to red soils at both the depths. Results of the study indicated that all the forms of potassium found higher in black soils compared to red soils. The water soluble and exchangeable K was higher in surface sample compared to sub surface in both the soil type. Whereas, non-exchangeable, lattice and total K was higher in sub surface than the surface in both the soil types. The water soluble form of K showed a significant and positive correlation with sand in red (r= 0.755*) and black (r= 0.527*) soils. The exchangeable K was significantly and positively correlated with CEC (r= 0.721* and r= 0.807* in red and black soils, respectively) whereas, non-exchangeable K, lattice K and total K showed positive correlation for clay.
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