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From flowering to maturity, it takes 25 to 55 days for spring sowing and 25 to 40 days for summer sowing. There are differences among different varieties. About 15 days after flowering and pollination shield is the seed formation stage. The comparison period requires clear weather, a large diurnal liquid temperature difference and suitable soil moisture.
Management of water and fertilizer during sunflower flowering period:
Sunflowers basically end from budding to flowering, which is a critical period for the formation of seeds and flower disks. During this period, the water requirement of the plant accounts for more than 60% of its lifetime water requirement. If the water supply is insufficient, it will cause poor seed development and increase the empty shell rate. Therefore, sufficient water supply should be ensured during this period, and appropriate top dressing can be combined with watering. Apply 5 to 10 kilograms of urea and 10 kilograms of diammonium per acre.
Pollination methods during sunflower flowering period:
Sunflowers are insect-pollinated flowers and cross-pollinated crops. Under natural conditions, they rely on bees and insects to complete pollination and fruiting. In the case of insufficient bee sources and insects, artificial assisted pollination should be used to increase the pollination and fruiting rate of sunflowers.
For artificial pollination of sunflowers, you can cut a carton board into a disk as big as the flower disk, cover it with cotton wool to make the central part slightly convex, wrap it with flannel or gauze, and tie a handle on the back to make a pollination puff. When pollinating, hold the pollen puff with pollen in one hand. Hold the flower disk with one hand, use a pollination puff to press the flower disk with slight pressure and tap it a few times to let the pollen fall on the stigma.
Artificial assisted pollination should be carried out from about 9 a.m. to 12 a.m. when the dew has subsided and when pollen grains are abundant and vitality is strong. Generally, it needs to be done two or three times in a row. The first time is when half of the flowers in the flower disk are open, and the second time is when half of the flowers in the flower disk are open. , the third time when the flower in the center of the flower plate blooms.
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