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A field experiment was carried out at the experimental Farm-College of Agricultural Engineering Science University of Baghdad Iraq during the autumn season of 2018 and spring season of 2019 to study the effect of Whey concentration (0, 25%, 50% and 75%) and three dates of foliar application (spraying after each Irrigation, spraying after twice Irrigation and after three times of Irrigation) was applied one month after emergence on growth traits, grain yield and it’s components of Sorghum (var.Bohooth.70) . The experiment was applied using R.C.B.D arranged in split plot with three replication. Foliar application dates were used as main-plots, while whey concentration was used as sub plots. Results showed that, in both seasons spraying whey at a conc. 75% significantly increase plant height, leaf area, Biological yield, weight of grain per head, number of grains per head. The highest grain yield in both seasons was 7.037 and 6.804 t. ha for autumn and spring receptively. Foliar application at the date after each irrigation gave highest mean in all growth traits, grain yield and it’s components. The highest grain yield in autumn and spring seasons was 6.527 and 6.118 t. ha respectively. Highest grains yield 7.320 and 6.779 t. ha can be obtained when sorghum plant were sprayed with whey at conc. 75% after each Irrigation in autumn and spring respectively.

EFFECT OF FOLIAR APPLICATION OF WHEY ON GROWTH TRAITS, GRAINS YIELD AND IT’S COMPONENTS IN SORGHUM (VAR. BOHOOTH 70)