부산대학교 도서관

Climate change and global warming have increasingly become relevant factors in recent years in determining the success of wheat production under heat stress conditions. Throughout its growth period wheat crop requires varying degrees of temperature to achieve ideal growth. Any variation from optimal temperature adversely affects plant growth and development. Many places where wheat is grown have high temperatures at the time of grain filling which is a major constraint on yield potential. A field experiment was conducted during the Rabi season of 2020–21 at Student’s Instructional Farm of Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya, Uttar Pradesh to evaluate the performance of wheat varieties under heat stress conditions. The treatment for the experiment consisted of sowing on three different dates, i.e., D1 (30th November), D2 (15th December), D3 (30th December). It was observed that delay in sowing of timely sowing varieties from first fortnight of November to first fortnight of December and late December led to the varieties facing an increased temperature than that required by them during the reproductive stage which decreased substantially almost all the yield components measured viz: number of ear bearing tillers per plant, number of grains per ear, ear length (cm), grain yield per plant (g), biological yield per plant (g), which caused severe reduction in yield in V1 (PBW-343) and V2 (HD-2967). This reduction was caused due to the onset of high temperature during crop growth and particularly grain filling. Variety V3 (Halna) being late sown variety was able to withstand the detrimental effect of increased temperature as it is suitable for growing till late December and thus, ultimately was able to be obtaining higher yield.