The water stress resistance to some foreign sunflower hybrids.

This paper describes the drought strong negative impact on the year 2007, in comparison with the average of years 2005-2006 to sunflower seed yield of the 5 foreign sunflower genotypes, in the presence of a Romanian control. There was substantial variability among genotypes. The most drought resisting sunflower hybrids were Aldaba and Fleuret. Experimental work has shown that water stress resulted in a greater reduction in seed yield than stress in later stages of development. Not only is there an overall reduction in seed yield, but the oil content and oil yield can be reduced. Although many tall varieties of sunflower are considered drought resistant, the potential yield of the cultivars is quickly reduced by water stress.