Artificially assisted pollination Watermelon flowering results such as in the low temperature and rainy season, fruit set is more difficult. On the one hand, low-temperature and rainy weather is not conducive to bees and other pollinating insects coming out of activity; on the other hand, there is a lot of rain, and it is very easy to flush out the pollen on female stigma or break pollen to lose the ability to germinate. It is difficult to complete the fertilization process. Therefore, artificial auxiliary pollination is necessary at this time. The specific approach is: According to the local weather conditions, in the afternoon or the evening before the rain, the female and male flowers open the next day with a paper tube, the next morning when the flower, remove the paper tube for artificial pollination. When pollinating, first remove the male flower, strip the petals, leave the anthers, and then gently apply the pollen to the stigma of the female flower. During the pollination process, the movement should be light, and the baby should not be touched by hand to avoid mechanical damage and affect the fruit set. After pollination, the female flower is covered with a paper tube. After 3 days, remove the paper tube so as not to affect fruit enlargement. When flowering pollination, in the event of short showers, dry pollen can be given on the stigma of the female without water in two hours after the rain. Three hours after the general pollination, the rain will have little impact on the fruit set. If it is less than three hours, it should be recharged once. In rainy weather, the male flowers that are about to open can also be taken off and left open for indoor use. The female flower sleeve, when pollinated the next morning, removes the female paper tube, takes the open female flowers in the room for pollination, and protects the female flowers after pollination. The choice of appropriate melons and melons for melons and melons is extremely important for the size of the fruit, the level of yield, and the quality of the product. The main female first flower due to low node, the result is small, thick skin, fruit shape is not correct, generally not retained; high-section stay late melon ripening period, and plant growth will often cause difficulties in fruit set, it is also used less. The second and third female flowers on the main vine are generally selected for production, and they are found in verses 15-20. Late-maturing varieties and multi-vine pruning, retaining melon section can be higher, early maturing varieties with early planting and less dense vine pruning, leaving the melon section should be lower. Before and after fruit set, in case of unfavorable conditions such as low temperature, drought, lack of light, etc., or when the plant growth is too weak, the melon section is higher. The side vines are reserved after the melons, and when the main vines are injured and the fruit is not set, the first and second female flowers can be reserved. The number of melons in a watermelon varies depending on factors such as cultivation form, variety, and planting density. In general, in the middle of fertilizer and water conditions, the use of fruit type, double vine pruning, planting 450-500 per acre, leaving one melon per plant is appropriate; sparse plant, small melon, three or more vine pruning, fertilizer water With good conditions, you can keep more melons. Folding melons constantly changes the location of the fruit, so that the melon surface receives even light, the skin color is the same, and the melon pods are evenly matured. Fell melons are generally carried out in the middle and late stages of the squashing period, turning once every 7-8 days and turning 2-3 times. Care should be taken when turning melons: First, the time for picking melons is appropriate for sunny afternoons; secondly, melons should be turned along the lines (ie vascular bundles) on the stems. Can not be strong twisted, so as not to injure the stem and stems and leaves; Third, when the melon hands folded operation, hold the fruit tail in one hand, hold the fruit top in one hand, gently twist both hands at the same time; Fourth, each time in the same direction Gently rotate, the angle of a flip can not be too large, so as to turn out of the original ground. Judging the maturity of ripened and harvested watermelon fruit requires a certain period of time. Under normal circumstances, early maturing varieties require 28-30 days from opening to maturity of female flowers, mid-maturing varieties require 30-35 days from female flower opening to maturity, and late-maturing varieties require 35 -40 days. Moderately ripe watermelon has a sweet taste, good tan color, good tannins and juice, less fiber, good flavor, and good quality. At present, the main methods for judging the maturity of watermelon are visual inspection, hand touch or tapping, marking, and specific gravity. 1. After the fruit matures by visual inspection, the peel is hard and bright, the pattern is clear, the umbilical and peduncle parts of the fruit are inward contraction and depression, the yin of the fruit is whitish to yellow and rough, and the villi on the stalk mostly fall off, before and after the fruit section 1-2 knots must wither and so on, these can be used as a sign of watermelon ripening. Second, the hand touch or tapping mature watermelon touch feel smooth; and immature watermelon, a touch of astringent when touched. In addition, when you use your hands to hold melons, tapping or fingering the melon, if you give out the low voiced sounds of pipa, pimple, and quail are mostly ripe melons, on the contrary, if you give birth to pipa, pipa, and pimple, then most of them are raw melons. Third, the labeling method It is based on the maturity of each species requires a certain amount of accumulated temperature and days, based on flowering pollination, the single melon mark. According to the accumulated temperature or number of days required for the maturity of each species, the maturity period is calculated. By combining the fruit setting date and the cut melon check, the ripeness of the collected watermelon can be guaranteed. Fourth, the proportion of mature watermelon and water in the proportion at room temperature is different. The specific gravity of water is 1, while that of mature ripe melons is 0.9-0.95. Put the watermelon in water and observe. If the watermelon is completely submerged, it indicates that it is raw; it is surfaced to a large extent, indicating that the specific gravity of the melon is less than 0.9, and the watermelon is too ripe; if the surface is not large, it indicates that the melon is ripe. In practical applications, in order to accurately determine whether a watermelon is ripe, comprehensive consideration should be given to various factors. It cannot be asserted by a single factor alone. Harvest maturity should also be determined based on market conditions. If the local supply can pick nine ripe melons, supply the market in the afternoon or the following day. Transportation and harvesting of eight ripe melons can be harvested in the field. The quality of the watermelons currently available on the market is poor. Except for the nature of the varieties and the degeneracy of the varieties, the picking of raw melons is an important reason. In addition to the lack of identification experience for the maturity of watermelons, it is mainly human factors, and some melon farmers believe that Early melons have high prices and heavy melons. Early harvesting is beneficial to the growth and results in the later period, regardless of the impact of raw melons on quality.