Artificially assisted pollination is the most critical technical link in watermelon hybrid seed production. Proper pollination methods can not only increase seed yield, but also ensure seed purity. The techniques are summarised as follows: 1 The father of the early sowing father is sowed 15-20 days earlier than the female parent. If necessary, the father can protect it by adding an arch shed; and the fertilizing water is added to promote its growth so that it can be seen accurately before pollination. Clear fruit type and color, in order to facilitate decontamination, and there are sufficient male flowers for pollination. 2 Before strictly pollinating the pollinator, the parents should be carefully examined on a tree-by-plant basis to see if their leaf shape, leaf color, melon vine, velvet, and young fruit shape and color are in line with the standards of this species. Strains. In particular, the father of the melon plant should be more careful, must be observed repeatedly before the use of flowers, and removal of the fruit will be enlarged, in order to facilitate the vigorous growth of the father, more vines, more male flowers. 3 All female and male flower buds of the female plant must be strictly removed before the male parent is pollinated. In addition to the usual use of pruning to remove weight, 2 days before pollination, the male flower buds must be checked by the plants, by vines, and leaf by leaf to determine if the net is removed. When pollination is repeated, it is strictly forbidden to have female and male flowers in the isolation cap, and the male flowers to be removed are buried underground to prevent confusion caused by string powder. In the female parent plant, the staminal bisexual flower around the head of the female stigma was found to be removed by hand, and seeds could not be pollinated again. 4 During the pollination of the mother's female flower wearing a cap, check carefully every afternoon in the mother's field, and wear a cylindrical paper isolation cap on the female flowers to be opened the next day, and use ordinary paper to make caps on rain-free days. It should be used in rainy days. Sulfuric acid paper or other impervious paper bags, plastic isolation caps can also be used, hat size should be appropriate to prevent too easy to fall or too small damage to the flower, and beside the grass stick, branches and other more conspicuous signs, To facilitate pollination on the second day. On the second day of pollination, remove the hat, wear it immediately after pollination, and remove the next sign. 5 Male male flowers collected for pollination of male flowers should be picked before opening in the morning, collected and placed in a container with a large mouth, covered with shade, and pollinated female flowers after natural opening, if the male pollination is fixed. The male must be bagged every day. In the afternoon, he chooses the male flower bag that will be opened the next day in the father Honda, and pollinates the female female flower after the flower is opened the next day. Male flowers that have been opened are not available for flower selection, as well as male or sterile male flowers on diseased plants. 6 timely pollination in sunny conditions, usually in the early morning from 5:00 to 6:00, the petals began to loosen, pollen began to crack at 6:00-7:00, pollen was dispersed, and the corolla was fully deployed. Freshly opened female flowers are most energetic and weaken after 2 hours. The higher the temperature, the weaker and the faster. After 10:00 or when the oily mucus appears on the mother's stigma, the energy is very poor, so pollination should be ended beforehand. Avoid pollination when there is grease-like mucus on the mother's stigma. 7 When sufficient pollination and pollination are carried out, gently hold the pedestal of the female flower to expose the stigma. Then, the petals of the selected male flower are everted and the stamens are exposed. The pollen is gently applied on the stigma of the female flower. The female stigma of the watermelon is split into three petals, and the pollen is completely and uniformly imparted to each of the petals during pollination, otherwise the deformed fruit and the amount of seed produced are liable to decrease. And pollinate a female flower with enough pollen to increase the number of fertilized ovules. 8 Pollination mark Insert pollen (iron wire) or fruit shank on the fruit-setting section that has just been powdered to put a plastic ring on the pollination mark. The color or shape of the mark should be changed every 5 days. The size of the plastic ring should be suitable to prevent the ovaries from being worn or fall off. 9 Check pollination effect After the pollination, the afternoon of the next day, if the female flower handles sag and grow, the front of the ovary starts to touch the ground, indicating successful pollination. If the female flower stalk is still straight up or forward, generally no powder is given. At this point pay attention to clean up the mark on the strain, reselect the female flower, and re-pollinate. 10 The use of insecticide-suppressed caps to isolate insecticides can only prevent large-scale flying insects such as bees and butterflies, but it is also very ineffective for small-scale crawling insects such as thrips and ants. Therefore, during pollination, efficient pesticides must be used every 3-5 days to kill tiny insects. It is also possible to smoke the isolation cap with a hygiene ball for 2-3 days before wearing the cap or to steam the isolation cap with DDV daily.
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