Potassium Release Characteristics in Relation to Plant Uptake in Soils of Major Cropping Systems in Kurnool District

Abstract

Sixty representative surface soil samples (0-15 cm) were collected from 5 major cropping systems (viz. rice-rice, fallow-bengalgram, groundnut-groundnut maize-maize, rice-maize/mustard) covering 13 mandals in Kurnool district of Andhra Pradesh and among them 30 samples were selected for investigation based on K status. The potassium releasing characteristics of thirty soils and their relationship with plant uptake was studied. The potassium release characters were the highest in maize-maize cropping system and the lowest in groundnut - groundnut cropping system. Lower amounts of cumulative K was observed in all soils except in soils of Srinagaram and Rythunagaram under present investigation. Lower cumulative K and continuous cropping would lead to depletion of soil K reserves and result in K deficiency. All investigated soils recorded less constant rate K than critical value indicating that these soils had low supplying powers to plants. Among the K release i.e cum- K and step K obtained with boiling 1N HNO3 showed maximum positive and significant correlation with dry matter, K content and K uptake while constant K showed minimum correlation.

DOI

https://doi.org/10.29321/MAJ.10.201715

Pages

28 - 31

Creative Commons

Copyright

© The Author(s), 2026. Published by Madras Agricultural Students' Union in Madras Agricultural Journal (MAJ). This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited by the user.

Keywords