Examine The Efficacy of Mannitol and Nano Urea in Alleviating the Negative Impacts of Terminal Heat Stress on Wheat (Triticum Aestivum L.)

This study: “Examine the efficacy of Mannitol and Nano Urea in alleviating the negative impacts of terminal heat stress on wheat (Triticum aestivum L.)” was carried out during the winter season in the marketing years 2022-23 & 2023-24 at the student instructional farm (SIF) of Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya- 224229 (UP. The experiment was done in the Split Plot Design with 3 replications, 7 treatments and wheat variety (HD 2967). The observation has been studied on growth, bio-chemical, yield and yield attributes of wheat. Observations were recorded at 60, 90 DSS and maturity stages in timely (15 November) sowing vs late (15 December) sowing. Note: Yield and yield parameters were recorded at the time of harvest of the crop. Mannitol and nano urea were sprayed on the leaves at 30, 60 and 90 DAS. Foliar application of nano urea with 25 ppm was recorded superior on plant height (cm), dry weight plant-1 (g), chlorophyll content in leaves (Arnon method), Catalase activity (g-1 fresh weight min-1), Peroxidase activity (mg g-1 fresh weight min-1), Super oxide dismutase activity (mg g-1 fresh weight min-1) However, yield and yield attributes viz length of spike, number of tillers plant-1, number of grains spike-1, grain yield plant-1 It is concluded from the result that foliar spray of nano urea 25 ppm was found most effective to increasing all characters and yield parameters of wheat.