How long is the flowering period of sunflowers?

How long is the flowering period of sunflowers? How to manage the flowering period of sunflowers? Do you have any netizens who can help introduce the main flowering period of sunflowers from mid-July to mid-August? Sunflower florescence means that 75% of the sunflower tongue flowers bloom, that is, the flowering period of the sunflower can reach more than two weeks, and netizens can have enough time to watch. The flowering stage of sunflower is divided into bud stage, flowering stage and mature stage. The land planting network has sorted out the management methods for the above three stages, which are listed below for netizens' reference. First, the management method of the bud stage of sunflower: the star body with a diameter of 1 cm appears at the top of the sunflower, commonly known as budding. It takes about 20 days from budding to flowering, which is not only the period of vegetative growth and reproductive growth, but also the most exuberant stage in life. During this period, sunflowers need the most fertilizer and water, accounting for about 40% to 50% of the total amount of fertilizer and water needed. If the demand for water and fertilizer can not be met in time in this period, the yield will be seriously affected. Second, the management method of sunflower flowering period: there are 75% of the ligulate flowers in the field, that is, entering the flowering stage. It usually takes 6-9 days for a disk to open from a ligulate flower to a tubular flower. The inflorescence is in full bloom from the second day to the fifth day. The number of flowers in these four days accounted for about 75% of the number of flowers. Most of the flowers bloom from 4 to 6 o'clock in the morning, and the next morning they are pollinated and fertilized. Unfertilized branches can remain intact for 7 or 10 days. The seed setting rate of self-pollination of sunflower is very low, only about 3%, and the seed setting rate of cross-pollination is high. However, if the temperature is high, Rain Water is more, the humidity is high, the light is insufficient, the soil is dry, the seed setting rate will be greatly reduced; therefore, adjusting the sowing date, timely fertilization and watering, preventing and controlling diseases and insect pests, and taking measures such as bee release or artificial pollination can improve the seed setting rate. Third, the management method of sunflower maturity: from flowering to maturity, spring sowing for 25-55 days and summer sowing for 25-40 days. There are differences among different varieties. About 15 days after flowering and pollination shield is the stage of grain formation. It needs sunny weather, large diurnal liquid temperature difference and suitable soil moisture. Management of water and fertilizer in sunflower flowering period: sunflower basically ends from budding to flowering, which is a critical period for the formation of seeds and disk. In this period, the plant water demand accounts for more than 60% of the lifetime water demand, if the water supply is insufficient, it will cause seed stunting and increase the empty shell rate. Therefore, during this period, adequate water supply should be ensured, and proper topdressing combined with watering should be applied with 5kg urea and 10kg diammonium per mu. Sunflower pollination method: sunflower is insect-pollinated, cross-pollinated crops, under natural conditions, pollination by bees and insects to complete pollination. In the case of insufficient bee sources and insects, artificial pollination can also improve the seed setting rate of sunflower pollination. The artificial pollination of sunflower can be cut into a disk as big as the disk, padded with cotton wool to make the central part slightly convex, wrapped with flannelette or gauze, and a handle is tied on the back to make a pollination puff. when pollinating, hold the pollination pounce with pollen in one hand, hold the disk in the other, press the disc slightly with pollination pounce and gently pat it a few times, let the pollen fall on the stigma. Artificial pollination should be carried out after the dew dissipates at about 9 o'clock in the morning to 12:00, when there are many pollen grains and full of vitality, generally two or three times in a row, the first time when half of the flowers in the disk are blooming. the second and third times when the flowers in the center of the disk bloom. Control methods of sunflower borer: sunflower borer, also known as sunflower borer, is an important pest on sunflower, which is mainly damaged by larvae eating sunflower seeds and forms many crisscross tunnels. the biting debris and feces filled the tunnel caused serious pollution, and the disk and seeds became moldy and rotten after rain. The flowering stage of sunflower is the active period of adult borer, which usually lurks during the day and begins its activity in the evening. It feeds nectar on the sunflower disk to mate and spawn, and the egg stage is 3-4 days to hatch larvae. The control method of sunflower borer larvae is to spray 8000 units / mg of Bacillus thuringiensis insecticides per mu after 50% of sunflowers bloom, diluted with talc powder into dust. Click to get more sunflower planting techniques click to get more food crop planting techniques