The role of silica fertilizer on morphological traits of sorghum forage under drought stress

Evaluate silica fertilizer's effect on the quantitative and qualitative yield of forage sorghum (Sorghum bicolor L.) under drought stress. A split-plot experiment was implemented in a randomized block design with three replications in two cropping years, 2017-2018, in a farm located in the Varamin - Iran. The treatments included irrigation at three levels of 60, 120 and 180 mm of evaporation from class A's evaporation pan level. The main factor was silica fertilizer as non-consumption (control), foliar application and silica irrigation fertilizer as a secondary factor. Based on the obtained results, the treatment containing total chlorophyll, RWC and stomatal conductance was obtained from the 60 mm evaporation treatment and silica fertilizer use in irrigation water. The use of silica fertilizer as irrigation water reduced the Hydrogen cyanide content by 4%. The highest amount of crude protein was estimated to be 12.60 from 180 mm stress treatment and the use of silica fertilizer in irrigation water, which were 19% higher than the control treatment, respectively. The best sorghum dry forage yield was obtained from 60 mm evaporation irrigation and silica irrigation fertilizer with an average of 82.22 ton ha-1 , which was 52% higher than the 180 mm evaporation stress treatment.