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Subject: Seed Science and Technology × Author: K.T. Uma × End date: 2019 × Start date: 2010 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Effect of biostimulants to mitigate the impact of terminal heat stress on growth and yield in wheat (Triticum aestium L.)
    (CCSHAU, 2019) K.T. Uma; Sangwan, V. P. S.
    A field experiment was conducted at Department of Seed Science and Technology, CCS HAU, Hisar, Haryana to study the efficacy of bio-stimulants in mitigating terminal heat stress and also to assess effect of bio-stimulants on growth and yield in wheat. The experiment was carried out in randomized block design and replicated thrice. The experiment consisted of three date of sowing i.e., 15th November (normal sown), 1st December (late sown) and 15th December (very late sown) with two contrasting varieties, WH-711 & WH-1124 and foliar spray with eight biostimulants such as control (water), glyceine Betaine (600ppm), salicylic acid (400 ppm), cytokinin (100 ppm), ascorbic acid (10 ppm), orthosalicylic acid (20 ppm), Citric acid (1.5 %) and KCl (1 %). Biostimulants were sprayed at anthesis stage. Result shows that, grain yield was increased significantly and maximized (4.57 and 5.15 kg plot-11 for WH-711 and WH-1124 respectively) when the crop received foliar spray of glyceine betaine (600 ppm) at anthesis stage over control. The corresponding values with the foliar spray of salicylic acid (400 ppm) showed same trend like glyceine betaine and were found to be statistically at par. Variety WH-711 has performed better when it sown on normal date of sowing whereas it is second date of sowing for variety WH-1124. Application of bio-stimulants showed positive effect on length of ear, number of grains per ear and grain yield whereas plant height, effective number of tillers per plant and number of days to 75% heading remains unaffected. Variety WH-711 had higher germination percentage, shoot length and vigour index-I whereas seedling dry weight was more in late sown variety and thereby vigour index-II too. The study thus reveals that ill effects of high temperature stress on yield & yield attributes of wheat varieties may be improved by treatment with glyceine betaine (600 ppm) under normal as well as late sown conditions.