The oil sunflower crop has a short growth period, wide adaptability, strong stress resistance, high yield, high oil yield and excellent oil quality. Vigorously developing the cultivation of oil sunflowers not only alleviates the tension in oil consumption, but also makes full use of land resources and significantly increases the income of farmers. Since oil sunflower is a cross-pollination crop, the yield is very low in the case of self-pollination. Therefore, in the flowering and filling period of sunflower oil, bees are released in the field or artificially assisted pollination is used to increase the seed setting rate, so as to achieve the goal of high yield.
First, the pollination method is generally used for large-scale planting bee pollination, such as no bee source or flowering insects and other pollinators less, must be artificially assisted pollination, there are two ways:
"Powder" method of pollination: use a cardboard or thin wood board with a diameter of about 10 cm, spread a layer of cotton, and cover it with gauze or flannel to make a "powder" of the same size as the faceplate. While pollinating, one hand holds the disk neck and the other hand gently touches the face plate with the “powder puff†so that the pollen sticks to the “powder puff†so that it lasts two or three times, and then the “puff child†with the pollen is stuck. To contact other disk, also contact 2 to 3 times, walking along the sulcus to achieve the purpose of pollination.
Disk contact method: This method is simple and easy, as long as the two rows of adjacent disk contact in the flowering phase, and gently shake it, you can play a role in pollination.
Second, pollination conditions and the number of times when artificial pollination is best to choose sunny weather, less rain, the temperature between 20 °C ~ 25 °C weather, pollination time should be 10 am ~ 11 am.
General artificial pollination can be twice. The first day of the oil sunflower flowering period (70% of flowering plants) was carried out for the first time, and the second time every 5 to 7 days.
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