Watermelon is an insect-like flower crop, and flowering mainly depends on bees and other insects. However, watermelons often encounter bad weather during flowering, such as low temperature and rain, or high temperature and rain, insect activity is low, prone to pollination, resulting in low fruit setting rate. Therefore, artificially assisted pollination is a major task for high yield watermelon cultivation. The following talk about the key technologies of watermelon pollination. First, sit the melon section selection. The appropriate stay in Guatemala is determined by species and climatic conditions. Generally, early maturing cultivars stay in the main vines from the 12th to 15th quarters, which is the second female flower; middle and late maturing cultivars stay in the vines from the 20th to the 25th, which is the second or third female flower. For fertilizers that lack plant growth potential, they should postpone the retention of guaranty. The fertilizer is sufficient and the plant growth potential is strong, and the melon section can be advanced. Second, male and female flower selection. (1) female flower selection: The quality of the female flower is good and bad directly affects the fruit setting rate of the watermelon. Female scented vines, lateral vines with stout stalks, ovary hypertrophy, no deformity, well-developed, and tender green are required. It is not appropriate to pollinate female flowers that are long and thin and thin and thin in the ovary. (2) Selection of male flowers: When the male flower is open, the pollen is mature and has the ability to pollinate. The pollinating male flower should be selected on the same day and the color is bright and the corolla diameter is large. Third, grasp the best pollination time. The flowers of watermelon mostly begin to open at about 6 o'clock in the morning, and the most active physiological activity is at 9:00, which is the best time for pollination. After 10 o'clock in the morning, a mucus was gradually secreted on the stigma of the female flower, and the corolla began to fade to reduce the pollination effect. Therefore, artificially assisted pollination is generally performed at 7-10 am on sunny days. Rainy weather blossoms later and pollination time can be postponed to 8-11 hours. Fourth, adopt advanced pollination methods. (1) "Flower to Flower" pollination method: Immediately release the male flowers that were opened and loosely powdered on the day. Be careful not to shake off the pollen. Gently squeeze the petal by hand, and then tap the male stamens to the stigmas of the female flowers to make a few clicks. Yellow pollen can be. Usually 1 male flower can be pollinated with 3 female flowers. (2) "Pen-painting" pollination method: Take off the male flowers that were opened on the day and mix the pollen in a clean container (such as a glass box, cup, dish), and then use a new soft-bristle brush or a small brush to draw pollen. The stigma of the female flower is lightly applied to the stigma with obvious yellow pollen. Fifth, artificial pollination precautions. (1) If the pollination occurs in rainy weather, the rainproof paper cover should be placed on the female flower before the opening of the female flowers, and the male flowers to be opened the next day should be played back in a dry place indoors until the male flower is normally opened and loose powder is brought to the field. , remove the female flower mask pollination. After pollination, put a paper cover on the female flowers to prevent pollination failure. (2) Showers occurred during flowering and pollination, and pollination was conducted 2 hours after the rain. If pollination occurred within 3 hours after pollination, the rain should be given once in a timely manner. (3) On the afternoon of the next day after pollination, if the female flower handles sag and grow, the front of the ovary begins to touch the ground, indicating successful pollination. If the female flower stalk is still up or still straight forward, which is an indication of unsuccessful pollination, the male flower should be selected for re-pollination. (4) Watermelon can't stop artificial pollination regardless of weather, so as not to miss the best pollination time. SICHUAN UNIWELL BIOTECHNOLOGY CO.,LTD. , https://www.uniwellbio.com