Journal of Environmental Biology

Effect of foliar application of bioregulators for improving high temperature tolerance of wheat (Triticum aestivum L.)

H. Lakhran¹*, O.P. Sharma², R. Bajiya³, J.R. Choudhary⁴, S. Kanwar² and M. Choudhary²

¹Department of Agronomy, COA, Nagaur, Agriculture University, Jodhpur-341 001, India

²Department of Agronomy, Sri Karan Narendra Agriculture University, Jobner-303 329, India

³Department of Agronomy, Agricultural Research Sub Station, Nagaur, Agriculture University, Jodhpur-341 001, India

⁴Department of Plant Breeding & Genetics, Indian Agricultural Research Institute, New Delhi-110 012, India

*Corresponding Author Email : hansalakhran001@gmail.com

Received: 14.07.2020                                                                   Revised: 30.09.2020                                              Accepted: 12.12.2020

Abstract

Aim: The aim of the present study was to evaluate the effect of sowing at different thermal environments and its interaction with foliar spray of bio-regulators on yield and yield contributing traits in wheat.

Methodology: The present study was conducted by using split plot design with four replications consisting of 24 treatments, namely, main plots: three sowing at different thermal environments (22^oC, 20^oC and 18^oC) and sub plots: eight foliar spray of bioregulators (control, water spray, salicylic acid @ 100 ppm, salicylic acid @ 200 ppm, thio salicylic acid @ 100 ppm, thio salicylic acid @ 200 ppm, thioglycolic acid @ 100 ppm and thioglycolic acid @ 200 ppm).

Results: The results indicated that sowing at 20^oC recorded the maximum yield parameters viz, effective tillers/m row length, length of ear, no. of grains per ear, test weight, days to maturity and grain, straw and biological yield of wheat over sowing at 22oC and 18oC temperature. Sowing at different thermal environment treatments was found to be non-significant with harvest index of wheat. Among the foliar spray of bioregulators, the treatment B₄ (SA @ 200 ppm) significantly increased the yield components and yield, while remaining at par with B₆ (TSA @ 200 ppm) and B₈ (TGA @ 200 ppm) proved superior in comparison to rest of the treatments. However, the significantly higher harvest index was obtained under B₄ (SA @ 200 ppm) treatment and was statistically at par with all other treatments, except B₁ and B₂.      

Interpretation: It is concluded that salicylic acid @ 200 ppm at tillering (40-45 DAS) and ear emergence (60-65 DAS) stage may be sprayed on 20^oC temperature sown crop is a viable option to improve wheat yield under semi-arid environment.

Key words: Bioregulators, Foliar spray, Sowing temperature, Wheat, Yield attributes

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