EFFECTS OF GA3 AND NITROBENZENE ON GROWTH AND YIELD PERFORMANCE OF WHEAT UNDER LATE SOWN CONDITION

Abstract

To evaluate the effect of Gibberellic acid (GA3) and Nitrobenzene on late sown wheat, an experiment was conducted at the research field of Crop Physiology and Ecology Department, Hajee Mohammad Danesh Science and Technology University, Dinajpur, during November 2022 to April 2023. The experiment was laid out in a two factorial RCBD design with three replications. The factors used in the experiment were, Factor A: three growing conditions viz. Normal (seeds were sown on November 15, 2022), foliar application of GA3 under late sown condition (seeds were sown on January 1, 2023), and foliar application of Nitrobenzene under late sown condition (seeds were sown on January 1, 2023). Factor B: three wheat varieties (BARI Gom 28, BARI Gom 30, and BARI Gom 33). Interaction effect of growing conditions and wheat varieties significantly influenced the different physiological traits, yield and yield attributes of wheat. Highest SPAD value was found in BARI Gom 33 under normal condition and the lowest SPAD value was found in BARI Gom 33 under late sowing condition with Nitrobenzene, however they are not statistically different. Canopy temperature was cooler in normal growing condition compared to late sown condition. Foliar application of GA3 increased plant height, spike length, and biological yield in BARI Gom 28; thousand grain weight in BARI Gom 30 and BARI Gom 33; grains spike-1 and grain yield in BARI Gom 30. Foliar application of Nitrobenzene increased plant height, spike length in BARI Gom 28 and BARI Gom 33; grains spike-1, thousand grain weight, grain yield in BARI Gom 30 and BARI Gom 33; and biological yield in all the varieties. The results of the present study indicated that the application of GA3 and Nitrobenzene increased wheat yield at late sown condition, and BARI Gom 33 showed highest yield among the three late sown varieties.