HIGHLIGHTS
SUMMARY
Sowing date has a direct role in exposing sunflower plants to heat stress especially at reproductive stage that considered as a crucial in producing high quality seed. Sunflower plants were described to be sensitive even to short periods of heat stress, 36/24C° day/night, for 10 days, and seed filling in addition to the other yield components were severely impacted. Of the study showed the highest number of seeds per capitulum was at the interaction between the highest concentration of ABA and early planting of sunflower seeds. it was 45.56 g at . . .
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