Effect of Spraying Brassinolide on the Growth and Yield of Varieties Triticum Aestivum L

Abstract

The study was conducted during the season 2020-2021 in the Ramadi city western Iraq. In order to know the effect of Brassinolide on the growth characteristics and yield of three varieties of wheat (Abu-Ghreib, IPA-99 and Bhooth 10). A Randomized Complete Block Design (RCBD) arranged according to split-plots used with three replicates and 36 experimental units, four concentrations of Brassinolide (0, 2, 4, 6 mg L−1) were used in Main-plots (B0, B1, B2, B3) respectively, which was sprayed when flowering started. While three varieties of wheat (Abu-Ghreib, IPA-99 and Bhooth-10) were used in sub-plots (V1, V2, V3) respectively. The Concentration B3, variety V3, and the overlap B2×V3 gave the highest rates of grain yield, as it reached (9.95, 9.96 and 12.97 t.ha−1) respectively. As for the weight of 1000 grain no significant differences were shown among the concentrations of Brassinolide, while the variety V3 was significantly superior (35.23 g), there were no significant differences between the two study factors. Superiority of concentration B3, the variety V2 and the overlap B3×V2 by giving the highest mean for the trait of the number of grains per spike (56.70, 50.68 and 65.33 grain.spike−1) respectively. Superiority the concentration B3 and variety V3 by giving the highest mean the number of spikes per square meter (707.56 and 703.45 spike.m2) respectively, no significant differences appeared between the two factors of the study.