Effect of nitrogen and seed rates on growth and yield of forage sorghum (sorghum bicolor l moench cv. Abusabien)‎

الملخص EN

A field experiment was conducted to study the effect of nitrogen and seed rates on growth and yield of forage sorghum (Sorghum bicolor L Moench cv.

Abusabien) at of Sudan University of Science and Technology, Shambat, Sudan during 2004-05 and 2005-06.

The experiment was lied out in randomized complete block design with three replications.

There were three seed rates viz.

20 kg/fed (S1), 40 kg/fed (S2) and 60 kg/fed (S3) and two levels of nitrogen 0 kg/fad (N0) and 80 kg/fad (N1).

The observations including plant height, number of leaves and leaves area index were recorded periodically at 15 days interval ( three cuttings), and then plant population, fresh and dry weight were also obtained for two seasons.

The results showed that increasing doses of nitrogen increased all growth attributed but there were no variation due to seed rate.

On the other hand the results revealed significant differences for second cutting and third cutting of first and second seasons respectively for plant height and leaves area index..

The number of leaves showed significant differences in the second cutting in the first season only.

The results also indicated that there were significant differences for plant population, dry weight for two season but for fresh weight the significant difference was appeared only in the first season only , and also the variation is due to nitrogen nor seed rate.

KEY WORDS: Nitrogen, Seed rate, Growth, Yield and Forage sorghum.