Watermelons with high-quality gifts have grown on a larger scale in protected areas, such as sheds, and in places such as beijing, shanghai zhejiang. The introduction, research and dissemination in the southern provinces, particularly in the yangtze basin, have yielded good economic and social benefits. For example, in the early springs of the red melon, most cities and cities in the country are marketed in favour of consumers. Early spring greenhouses are a good means of generating efficiency gains. The construction of greenhouses in southern china. The primary role of greenhouses is to prevent rain, followed by temperature protection. Watermelon is most afraid of excessive rainfall, which in the south, especially in the spring and summer, has led to instability in its production. The use of greenhouse coverage and rain-proofing can better address this problem. Plastic sheds should be built on land of high ground, easy drainage, adequate sunlight and suitable for watermelon cultivation, especially in water fields that have not grown for many years。
It is generally appropriate to use bamboo sheds or steel sheds at 25-30 m long 2-2. 5 m widths of 7-8 m. Such cultivation is heavily invested and land selection is key. It is usually grown only in the same place for one year, and in the second year it is replaced by a suitable land, which is not available for many years. So consider greenhouse disassembly. The choice of species for early spring watermelons should be based on the choice of high-quality varieties for high-quality, high-quality and cost-effective purposes. At present, early spring is one of the most widely used varieties in production, including early childhood, ran, nueva ginran, lee su, mia, ice crystal, huamei, red jade and yoo yu. Early breeding is the foundation of this technology. In general, in january and february, before and after the spring festival, it is 7-10 days in a row。
The nursery basins should be used for multi-layer coverage in greenhouses with temperature-proof anti-frozen facilities such as high-power light bulbs such as ground-based electro-hot wires, in order to facilitate the seeding of seedlings and to produce seedlings as quickly as possible and reduce the probability of freezing. The yangtze basin is characterized by low temperatures and frequent cold flows. Watermelons are the most vulnerable to freezing from seeding to seeding, especially from seeding to seeding, and up to 1 to 2 days below 10 degrees are dangerous, avoiding cold currents as much as possible or using heat protection facilities. In addition, the preservation of seedbeds and nutrient drying to the extent possible is an effective measure to improve resilience to cold and disease. In order to promote the growth of seedlings, water must be fertilized in the middle of the day, which can be followed by 1 to 2 days of nutrient drying, which can contribute to increasing plant resistance to cold and disease. Early spring cover generally involves three layers of cover, namely greenhouses, small arches and plastic sheeting。
Full membrane coverage has the advantage of increasing water-preserving water with weed-free melon leaves and fruit-free sub-soil fertilizing water, reducing infestation and improving the appearance of fruit. Fertilizers must be applied before cultivation because of adequate membrane cover and the relative difficulty of pursuing them. Late-acting fertilizers, such as pie, livestock, soil fertilizers and potassium sulphate compound fertilizer, are suitable for use as base fertilizers, but are applied less rapidly after fermentation. Under-drives are used to water and fatten, i. E. Drip pipes are placed 50 cm from the plantation before the membranes, and fertilizers are fermented, immersed, filtered and dripped, thereby contributing to the protection of water melon leaves and fruit. Once a batch of guacamole has been removed, it is necessary to catch up on the fat in time for the consecutive fruit. When the plant is grown to about 1 metre, three to four volumes must be trimmed to ensure that each plant has two to three fruits。
