Watermelon is an androgynous plant of different flowers, female flowers and male flowers have nectaries, mainly by bees and other insects pollination, is a typical insects flower. The activities of insects are greatly influenced by the climate. Insects are active on sunny days without wind, but they are less active in low-temperature and rainy climates.
In addition, there is also a lack of insect pollination in the cultivation of protected areas. The best time for manual artificial pollination at this moment is 7 to 9 am. The method is to adopt the open male flowers on a sunny day and place them in a moisturizing container. Natural open.
When the female flower in the field is open, remove the petals from the open male flower or flip the petals to reveal the stamens. Then use the anthers of the male flowers to gently alter the stigma of the female flowers so that the pollen is evenly stuck on the stigma. Be careful not to touch the stigma. Male flowers can pollinate 2 to 3 female flowers.
On rainy days, it is best to use a paper cap to cap the male and female flowers at dusk 1 day before flowering to prevent the rain from wetting pollen and stigma and affect pollination and fertilization. After pollination, replace the female flower with a dry paper cap. The production method of the paper hat is: cut the old newspaper and old book paper into appropriate sizes, use a No. 5 battery as a mold to roll the paper into a cylinder shape, tighten one end of the cylinder, and then pull out the No. 5 battery.
The time of artificial pollination should be settled before 9:00 a.m. in sunny days, and the pollination rate of pollination decreased significantly after 9 hours. In the low temperature and rainy weather, watermelons bloom at noon, and pollination can be postponed properly.
The artificially assisted pollination is carried out in the second to third female flowers of the main vine. It is important to pay attention to the selection of large and full female flowers with long and thick flower stalks. Male flowers are not suitable for use in the field. They should adopt male buds in the field, place them in natural open spaces, and then pollinate them in the fields so that the amount of pollen is high and quality is ensured.
In addition, the stigma of female flowers is generally divided into 3 petals, and should be uniformly altered to avoid showing partial melons.
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