This study was carried out to determine the effect of silage on fermentation quality. The produced by forage yield mixed planting corn and soybeans which planted as a second crop in Mardin ecological conditions. field experiment Randomized Complete Experiment Design with three replications at 7 different ratios [corn (C), 70% + 30% soybean (70C30S), 60% 40% (60C40S), 50% (50C50S), +% 60 (40C60S...