الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 147 |  |  |
| | | from | 147 | | |
Abstract
The present investigation was conducted at Shandweel Agric.
Station, Sohag Governorate during two successive summer,2000 and 2001 to study the response of grain sorghum (cv. Dorado) to nitrogen, biofertilzation and foliar micronutrients. In both seasons, the experiment included 20 treatments which were the combination of five rates of mineral nitrogen fertilizer, i.e (control,30,60,90, and 120 Kg N/fed.), two treatments of biofertilizer i.e (control(inoculation) and inoculation by biogen) and two treatments of micronutrients i.e.(control and spray with setrin). Results of this experiment could be summarized as follows:
1- Number of days to 50% flowering:increasing nitrogen fertilization levels from 90Kg N/fed. Decreased this period, this trait was significant affected by biofertilization in both seasons. Micronutrients was significantly affected on the number of days to 50% flowering in 2000 season but in 2001 season the effect was insignificant.
2-plant height at 65 and 90 days was significantly increased by increasing nitrogen fertilization levels up to 90 Kg/fed. In both seasons.This trait was significantly affected by biofertilizer at 90 days in both seasons and at 65 days in the second season.The effect ofspraying micronutrients on this trait was significant at all ages in both seasons.
3- Stem diameter: at 65 and 90 days was increased by increasing nitrogen fertilization levels. This increase was significant at all ages in both seasons except for at 90 days in 2000 season.This trait was significantly affected by biofertilizer at all ages in both seasons except at 90 days in 2000 season. The effect of spraying micronutrients on this trait was significant at 65 and 90 days in 2000 season.
4- The number of green leaves/plant at 65 and 90 days was increased significantly by the increase of the nitrogen fertilization levels at all ages in both seasons except at 90 days in 2000 season. The highest number of leaves/plant resulted from application of 90 Kg/fed. At 65 days in 2001 season. This trait was significantly affected by the biofertilizer at all ages