A field experiment was carried out in fields of Department of Field Crops/ College of Agriculture- University Of Anbar in replace location (Abu-Ghariab) during 2016 in order to study the effect of sprayed of Thiamine Vitamin (B1) on green forage yield and quality four concentration of Vitamin (B1) 0, 100, 200 and 300 mg L-1 in three cultivars of sorghum (Bohoth Sabaaeen, Kafeer-2 and Mabrook).
The study factors were randomly distributed according to split plots arrangements in RCBD with three replications. The CV. Bohoth and Mabrook was superior in yield of fresh and dry fodder and its quality 50.40, 54.56, 39.31, 10.74, 54.56 and 19.63 ton ha-1, for three cuts respectively. The cv. Bohoth was also superior in first cuts in %protein and also the cv. Kafeer-2 was superior in the % fiber for the first cuts.in then the CV. Bohoth was superior in %ash for first cuts. The aqua solution of Vitamin (B1) led to significant effect in most traits of green and dry fodder yield and its quality. The concentrations 200 and 300 mg L-1 in most studied traits such as plant fresh fodder 50.76, 33.35, 30.11, 48.45 and 49.22 ton ha-1, and dry matter with 18.48 ,12.52, 10.84, 16.94, and 10.90 ton ha-1, for the same concentrations and for three cuts. The interaction between cultivars and Vitamin levels significantly affected in yield of fresh and dry fodder, percentage of protein in third cut and fibers and ash percentage in third cuts.