Response of wheat to potassium and its fractions in Punjab soils

HARPREET KAUR; R S GILL; G S DHERI

doi:10.56093/ijas.v91i4.112729

Authors

HARPREET KAUR Punjab Agricultural University, Ludhiana 141 004, India
R S GILL Punjab Agricultural University, Ludhiana 141 004, India
G S DHERI Punjab Agricultural University, Ludhiana 141 004, India

https://doi.org/10.56093/ijas.v91i4.112729

Keywords:

Potassium fertilization, Potassium uptake, Soil K fractions, Wheat, Yield

Abstract

A pot experiment was conducted at screen house of Department of Soil Science, PAU, Ludhiana during rabi 2017-18 to evaluate the response of wheat to applied potassium. Twelve soil samples were taken from all over Punjab varying in available K. Potassium was applied @ 0, 15, 20, 25 and 30 kg K/ha soil. The mean grain yield varied from 12.39 to 20.13 g/pot in K sufficient soils (>137 kg K/ha) and 8.43 to 12.09 g/pot in K deficient soils (<137 kg K/ ha). Increase in grain yield was significant up to 25 kg K/ha in K sufficient soils, however in K deficient soils, wheat responded up to 30 kg K/ha. Application of 30 kg K/ha resulted in significant increase in content of K fractions (water soluble K (WSK), exchangeable K (EXK) and non exchangeable K (NEK) as compared to control in both K sufficient and deficient soils. WSK showed significant and positive correlation with EXK (0.964*) and NEK (0.872*) indicating dynamic equilibrium between these forms of K. About 70.5 and 93.4% variation in grain yield of wheat was due to the combined influence of WSK and EXK in K sufficient and deficient soils, respectively. NEK accounted for only 0.9 and 5.2% variation in grain yield in K sufficient and deficient soils, respectively. Hence, contribution of NEK towards wheat yield in K deficient soils was higher as compared to K sufficient soils. Therefore, K deficient soils are more responsive to potassium application as compared to K sufficient soils.

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