Investigation of destructive effectives of nitrogenous fertilizers on protein and oil percentage in maize

In order to investigation of destructive effectives of nitrogenous fertilizers on forage quality in maize, experiment was conducted at Iran in 2010. First physic & chemical characteristics of soil was determined. Field experiment was carried out by a randomized complete blocks design with 3 replications. The factor which studied was nitrogenous fertilizer (0, 100, 200, 300, 400 and 500 urea kg/ha). The results showed that planting density had significant effect on fresh forage yield, dry forage yield, protein percentage, plant height and oil percentage. Means compression showed that fresh forage yield, dry forage yield, protein percentage and oil percentage were achieved under application of 300 urea kg/ha and also highest plant height was achieved under application of 500 urea kg/ha. The results this experiment showed that forage quality decreased under increasing of urea and plant height increased under this condition.