Effect of watering intrvals and weeding on growth and yield of Sunflower (Helianthus Annuus L)‎

الملخص EN

Field experiments were conducted in (2006\07 and 2007\08) growing seasons in the Demonstration Farm of University of Sudan for Science and Technology , Shambat to investigate the effects of irrigation intervals (7, 15, 21 and 30 days), and weeding( weeding and non weeding) on growth, yield and yield components of sunflower cultivar Haysun33.

The experiment was laid out in factorial randomized complete block design with four replications.

The results revealed that, the growth parameters ( plant height, number of leaves and stem diameter) ,and yield components (head diameter, head weight, number of seed per head, empty seed per head, 100seed weight and yield per unit area) gave significant differences due to application of watering intervals.

The irrigation interval every 7 and 14 days give better growth and yields.

On the other hand, weeding and non weeding have no clear effect on all above parameters.

In conclusion, sunflower was sensitive to long irrigation intervals, but not for weeding and non weeding.

KEY WORDS: Watering intervals, Weeding, Growth, Yield and Sunflower.