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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
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    Abstract - Issue Sep 2026, 47 (5)                                     Back


nstantaneous and historical temperature effects on a-pinene

Synergistic effects of sowing date and potassium nutrition on combating heat stress in wheat

 

J. Kaur*, M. Singh and A.A.S. Gill        

Department of Soil Science, Punjab Agricultural University, Ludhiana-141 001, India

 

Received: 01 January 2026                   Revised: 04 April 2026                   Accepted: 24 July 2026

*Corresponding Author Email : jaskirandeepkaur3253@gmail.com                    *ORCiD: https://orcid.org/0000-0001-8405-613X

 

 

 

Abstract

 

Aim: This study aimed to enhance wheat productivity under heat stress by management of sowing date and application of potassium.

Methodology: Field experiment in split plot design was conducted to study interactive effects of two sowing dates (early sowing (ES) on 30th October and late sowing (LS) on 30th November) and two soil K rates (no K (K0) and 25 kg K ha-1 (K25) in main plots and five foliar K sprays (control, 2 % KCl  at booting (KCl-B) and anthesis (KCl-A), booting + anthesis (KCl A+B) and 2% KNO3 at booting + anthesis (KNO3 A+B) in subplots to mitigate heat stress in wheat.

Results: Relative leaf water, chlorophyll content, evapotranspiration, apparent water productivity and water use efficiency of wheat were significantly increased by 25.1, 23.2, 22.9, 23.3 and 17.6 per cent, respectively, with ESK25 compared to LSK0. Physiological traits increased while proline content decreased significantly with ESK25. However, these parameters were at par in ESK0 and LSK25, but significantly different than LSK0. Foliar spray of KClB+A or KNO3 B+A significantly increased these parameters compared to control. Grain yield of wheat was significantly and positively correlated with all these parameters, except proline content.

Interpretation: The study confirms that early sowing, soil application and foliar feeding of K protects wheat from heat stress.

Key words: Heat stress, Potassium management, Sowing date, Synergism, Wheat

 

 

 

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