Seeded watermelons are sometimes very troublesome to eat, so many friends like to buy seedless watermelons. However, precisely because of the “seedless†of seedless watermelons, many people are worried that it is a genetically modified food, which will have an impact on health. So, is seedless watermelon genetically modified? At the same time, how can seedless watermelon grow better? Let's learn about it.
Seed watermelon is not genetically modified. The so-called genetically modified food is the use of biotechnology to transfer the genes of certain organisms to other species, transforming the genetic material of the organism, so that it can be optimized and improved in terms of traits, nutritional quality and consumption quality. The seedless watermelon is a triploid, which is formed by the diploid hybridization with the tetraploid produced by mutagenesis. Because the triploid cells have a joint disorder during meiosis, the triploid watermelon cannot form. Seeds, so seedless watermelons are not genetically modified.
Field management technology of seedless watermelon 1. Fertilizer management: water management, seedless watermelon watering at least 2-3 times in the whole growing season, the leaves increase after watermelon extension, the sunshine time is long, the water demand is increased, and it must be poured once. Extend the water." When the young melon grows to the size of the fist, the canned water is poured to ensure the yield and quality of the watermelon and normal growth and development. In the future, it is possible to decide whether to water or not according to the climate and soil moisture at that time, and stop watering one week before harvesting. Topdressing, watermelon is a favorite fertilizer crop, and reasonable fertilization is one of the important measures to ensure the high quality and high yield of watermelon. The general principle is: carefully apply the seedling fertilizer, skillfully apply the vine fertilizer, and reapply the fertilizer. Topdressing is based on quick-acting fertilizer. In the case of applying the base fertilizer, the non-sand soil generally does not apply the seedling fertilizer. In general, the top dressing is mainly carried out twice. The fertilizer should be mainly based on nitrogen fertilizer, supplemented by potash fertilizer, which promotes the vegetative growth of watermelon. To ensure the formation of the developed root system and sufficient leaf area required for high yield of watermelon, generally 8 kg of urea per acre and 5 kg of potassium sulfate. The second time is to apply quick-acting fertilizer before the fruit expansion period. The topdressing should be mainly potassium and nitrogen fertilizer, which is conducive to the formation of fruit yield and the improvement of quality. Generally, 20-25 kg of urea per acre and 10-15 kg of potassium sulfate. Water and fertilizer management should be reasonably controlled according to local soil climatic conditions and melon growth, so that combination of control and irrigation, irrigation and drainage combined.
2. Pruning vines: Seedless watermelons generally use double vines or three vines. The double vine pruning is chosen to stay outside the main vine, and a strong side vine is selected at the base of the main vine, and the remaining side vines are all removed. The stems and vines are distributed reasonably, and the leaves are ventilated and light-transmitted, which enhances photosynthesis and disease resistance, thereby increasing yield and improving quality. Pressing vines can fix the melons, prevent them from being blown over by the wind, and control the growth of the melons. When the main vine grows to about 30cm, the melon is removed from the upright type, forcing the melon to grow in a prescribed direction. Pressure vines generally have two ways of clear pressure and dark pressure. Ming pressure refers to the use of clods or branches to fix the vines on the ground; the dark pressure is to shovel the soil with a shovel, flatten it, and bury it in the ground. Generally, the main vine is pressed for the first time at 40-50cm, and then pressed once every 4-6 knots, and it needs to be pressed 2-3 times.
3. Artificially assisted pollination: In order to ensure the results of female flowers at the appropriate node, artificial pollination must be carried out. The fruit of the third female flower or the second female flower of the main vine has the best quality and the highest yield. Pollination is carried out every day from 7 to 10 am. In the morning when watermelon is flowering, the male flowers that have just been opened are collected from the pollinated variety, the petals are folded back to reveal the stamens, and then the head of the seedless watermelon female flower head opened on the day is lightly wiped for one week. To make it evenly pollinated.
4. Fruit retaining fruit: When the young fruit grows to the size of the steamed bread, the fruit begins to expand rapidly. At this time, the fruit is generally no longer dropped. It is necessary to select the fruit with good position and fruit shape in time, and the double or three vines are planted per plant. One fruit.
5. Pest Control: Prevention and control of pests and diseases is a regular work in field management, and is an important part of high yield. It is necessary to prevent early treatment. The diseases of seedless watermelon mainly include blight, anthracnose, leaf blight, etc., should spray 75% chlorothalonil 600 times solution, or 70% methyl thiophanate 500 times solution, or 70% senseng zinc 600 Double the liquid and use it alternately. 7-10 days before harvest, stop spraying.
6. Covered melon: In the late growth stage of seedless watermelon, the plants gradually decline, and the leaves can not effectively cover the sunlight. It is necessary to cover the melon with newspapers in time to prevent sun exposure.
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