Dynamics of Potassium Fractions in Surface and Subsurface Soil under Different Land use Systems in Alnavar Taluk, Dharwad District, Karnataka

Author: Ramesh, Vijay Kumar C. and Jakir Hussain K.N.

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Abstract

A field survey and laboratory investigation were conducted to study the dynamics of potassium fractions in surface and subsurface soils under different land use systems in Alnavar taluk, Dharwad district. A total of 120 composite soil samples were collected, comprising 60 samples from the surface layer (0–20 cm) and 60 from the subsurface layer (20–40 cm), which were analyzed for various forms of potassium. The results indicated that the sugarcane-based land use system recorded the highest potassium fraction content, with water-soluble K (WS-K) ranging from 3.01 to 5.11 mg kg–1, exchangeable K from 105.09 to 182.09 mg kg–1, non-exchangeable K from 214.95 to 452.15 mg kg–1, lattice K from 8685 to 13160 mg kg–1, and total K from 9181 to 13750 mg kg–1. This high potassium content in the sugarcane system can be attributed to the frequent application of potassic fertilizers and the incorporation of organic manures and residues, which enhance soil fertility. In contrast, other land use systems showed comparatively lower potassium fraction contents. The study underscores the significance of land use systems in influencing potassium dynamics in soils, highlighting the need for sustainable nutrient management practices to optimize soil fertility and improve agricultural productivity. These findings contribute to the knowledge of potassium dynamics in diverse agricultural systems and can guide farmers and land managers in implementing strategies to maintain and enhance soil nutrient levels

Keywords

Potassium, Fractions, Alnavar, Different Land Use Systems, Lattice K, Total K

Conclusion

Among the different K fractions in the surface and sub-surface soils of different land use systems, the WS-K was found lowest and is in the range of 1.60 to 4.04 mg kg–1, followed by Ex- K (91.77 to 195.98 mg kg–1), Non-Ex.-K (197.38 to 773.77 mg kg–1), lattice K (1.89 to 2.40 %) and total K (1.93 to 2.50 %) and among the different land use systems sugarcane land use system recorded higher potassium fractions content as compared to other land use systems and the available-K, WS- K and exchangeable-K fraction were recorded higher in surface soil and lower in sub-surface soil, whereas non-exchangeable-K, lattice K and total –K were recorded higher in subsurface soil in all the land use systems

References

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How to cite this article

Ramesh, Vijay Kumar C. and Jakir Hussain K.N. (2023). Dynamics of Potassium Fractions in Surface and Subsurface Soil under Different Land use Systems in Alnavar Taluk, Dharwad District, Karnataka. Biological Forum – An International Journal, 15(7): 419-423