Author(s):

Asheesh Chaurasiya, Durgesh Singh, Swaraj Kumar Dutta, Arnab Roy Chowdhury and Santosh Kumar Dubey

Abstract: Osmoprotectants/Synthetic compounds (KNO₃, CaCl₂ etc.) is beneficial to mitigate the ill effects of high temperature stress occurs due to late sowing of wheat and may enhance the yield to a profitable limit. In order to estimate the effect of synthetic compounds on performance of wheat under high temperature stress condition a field experiment was carried out in experimental farm of Bihar Agricultural University, Bhagalpur during the rabi season of 2014-15. Treatments were laid out in split plot design with three replications. Two different varieties of wheat i.e. DBW-14 (timely sown) and K-307 (late sown) were kept in main plots, subplot received foliar spray of different osmoprotectants. The foliar spray were as followed: M₁- no spray, M₂- KNO₃ (1.0 %) at booting stage, M₃- KNO₃ (1.0 %) at anthesis stage, M₄- KNO₃ (0.5 %) both at booting & anthesis stage, M₅- CaCl₂ (0.2%) at booting stage, M₆- CaCl₂ (0.2%) at anthesis stage, M₇- CaCl₂ (0.1%) both at booting & anthesis stage, M₈- Glycinebetaine (100 mM) at booting stage, M₉- Glycinebetaine (100 mM) at anthesis stage, M₁₀- Glycinebetaine (50 mM) both at booting & anthesis stage, M₁₁- Arginine (2.5 mM) at booting stage_, M₁₂- Arginine (2.5 mM) at anthesis stage, M₁₃- Arginine (1.25 mM) both at booting & anthesis stage and M₁₄- spray of water both at heading & anthesis stage. Result shows that ear head biomass, dry matter accumulation and grain yield was increased significantly while, growth attributes are found non-significant. Maximum yield was recorded (36.96 and 31.23 q ha^-1 for V₁ and V₂ respectively) when the crop received foliar spray of KNO₃ at the rate of 0.5% both during booting and anthesis stage over no foliar spray. The corresponding values with the foliar spray of CaCl₂ showed same trend like KNO₃ and were found to be statistically at par. Thus, the study suggests that foliar spray of KNO₃ at the rate of 0.5% both during booting and anthesis in a short duration variety like DBW-14 can provide the strengthen to plant against high temperature stress and provide better yield under late sown condition in most part of the country.

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