Vol. 7, Issue 2 (2019)
Forms and distribution of potassium in selected black soil series of Kavalur sub-watershed soils of Koppal district, Karnataka
Author(s): Shivaprasad Patil, Jagadeesh BR and Patil PL
Abstract: Potassium in soil exists in four different forms such as, water soluble, exchangeable, non-exchangeable and lattice potassium were studied in the surface and sub surface samples of Kavalur sub-watershed of Koppal district, Karnataka. The available potassium in black soil varied from 317.00 to 508.00 kg ha-1 in surface and 288.00 to 430.00 kg ha-1in sub surface soil. The higher value of available potassium indicated that these soils were added with sufficient quantities of potash fertilizers. The water soluble K of black soils ranged from 2.08 to 9.72 mg kg-1 in surface and 1.54 to 5.68 mg kg-1 in sub surface soil. The reason for higher water soluble K in black soil was mainly due to intensive weathering of K bearing minerals and also due external application water soluble K fertilizers. The higher exchangeable potassium at surface zone was mainly due to the fact that these soils had good amount of organic matter content which might have retained more K ions at exchange sites and also potassium retained through external source. The non-exchangeable potassium of black soils in surface samples varied from 451.37 to 914.37 mg kg-1and 499.07 to 955.14 mg kg-1 in sub surface. The lattice potassium in black soil ranged from 13,300 to 27,400 mg kg-1in surface and 14,600 to 29,800 mg kg-1 in sub surface. The type and nature of parent material present and degree of weathering are important for the rich lattice potassium content in the soils. Total potassium ranged from 14,100 to 28,600 mg kg-1 in surface and 15,500 to 31,000 mg kg-1in sub surface soils. The higher values of total K obtained were mainly because of higher lattice K concentration. The degree of weathering, type and amount of clay and K fertilizer application influences different forms of potassium.
Pages: 1306-1310 | 305 Views 46 Downloads
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How to cite this article:
Shivaprasad Patil, Jagadeesh BR, Patil PL. Forms and distribution of potassium in selected black soil series of Kavalur sub-watershed soils of Koppal district, Karnataka. Int J Chem Stud 2019;7(2):1306-1310.
