The watermelon crops are suitable for planting in a sunny, water-preserving and fertilizer-preserving environment. The watermelon colonization time in greenhouses is delayed by 10-15 days on March 10th and 20th, and the watermelon in the greenhouse is 5-7 days ahead of the greenhouse watermelon. Watermelon planting, today to introduce you to the spring watermelon planting time and planting techniques.
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 Spring watermelon planting time and planting techniques:
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Land preparation: 15 days before the watermelon planting, it is necessary to prepare the land for rumoring in advance. It is best to use sorghum double-row cultivation in greenhouse, with a large line of 90 cm and a small line of 40 cm. It is a small high levee with a width of 30 cm and a height of 15 cm. After the glutinous noodles are prepared, the mulch is prepared. For greenhouse cultivation, a plastic greenhouse can be set up before the preparation of the ground. The inner diameter of the greenhouse is not less than 6.5 meters, the height of the shed is not less than 1.6 meters, and the small arch shed in the middle of the greenhouse is 2.2 meters wide and the arch height is 0.7 meters. The thickness of the grass is not less than 5 cm. 6-7 days before planting in greenhouse cultivation, the mulch is covered with mulch.
Field management: 25-30 °C during the day, no less than 15 °C during the night, and ventilation when the temperature exceeds 30 °C during the day. After flowering, after the flower begins to appear, the temperature can be appropriately increased. It is 28-32 °C during the day and 15-18 °C during the night. The temperature difference between day and night is 10-15 °C. The growth of watermelon stems and leaves requires lower air humidity, relative humidity is about 60%, and 70-75% is required for flowering pollination. Therefore, it is required to cover the mulch film to reduce evaporation of soil moisture, and on the other hand, to ventilate and ventilate; to ventilate each time after watering to reduce humidity.
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Fertilizer management: The absorption of nitrogen, phosphorus and potassium in different growth stages of watermelon is different. According to the measurement, the amount of absorption in the emergence period accounted for 0.01% of the whole growth period, 0.54% in the seedling stage, 14.6% in the flowering period of the Lingling, and the result period was 84.85%. Therefore, the principle of fertilization should also be based on the amount of fertilizer absorbed in different periods of watermelon. After colonization, it is generally chased three times. The first time after planting the seedlings, it is called the seedling fertilizer, and each plant is poured with 0.3%-O.5% urea water 1kg. The second time is carried out when the vine is about 30 cm long, and the used cake fertilizer or ternary compound fertilizer is applied 5-8 kg per mu. The third time after the fruit is applied, the ternary compound fertilizer is applied 30 kg per mu, potassium sulfate 10- 15 kg. During the fruit expansion period, foliar spray fertilizer should be carried out 1-2 times, and 0.3%-0.4% potassium dihydrogen phosphate and 0.4% urea solution can be sprayed. Watering should be properly controlled, and watering should be added after fruit setting.
Weeding with chemical agents: Due to the large area of ​​watermelon fields, manual weeding is very troublesome. Experiments have shown that the soil spray is closed before the film is coated, and the following herbicides are better: trifluralin, durgrass and gramineae, dilofen, aconite, diuron to gramineae and sedge The control effect is quite good.
Watermelon pest control: The diseases of watermelon mainly include rickets, blight, blight, powdery mildew and anthrax. If you suffer from rickets and blight, you can use carbendazim and Luheng No. 1 for bed cleaning; if you have blight, you can use 15% watermelon remedy 300-350 times to fill the roots. 0.5 kg each time, 3-4 tablets of true leaves after planting, the control effect is better; if it is powdery mildew and anthracnose, can be used chlorothalonil, thiophanate, powder rust and other drugs control effect is better, alternate use .
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The insect pests of watermelon mainly include mites, mites, ladybugs, root mites, and red spiders. The control agent can be alternately controlled by avermectin, dichlorvos and enemy killing, and the root can be irrigated with trichlorfon. Advocate the installation of insecticidal lamps and yellow boards to induce physical control. It is worth mentioning that the root knot nematode is very serious now and there are outbreaks in many areas. Root-knot nematodes mainly infect plants at the seedling stage, causing greater damage. Therefore, the seedbed must choose the plot without root knot nematode. If the nematode is found after the seedling is planted, it can be irrigated with avermectin such as 1% mites clear 2000 times solution and 1.8% abatine 3000 times solution. Daejeon can use phoxim, millel, butyl thiocarbazone, diazinon, chlorpyrifos and other agents when planting.
Watermelon is hot and hot, very cold-resistant, with large melons and thick skin, but it is not resistant to storage. Watermelon is sensitive to low temperature. When stored below 9.5 °C, there is cold symptoms. When stored at high temperature, the sugar content is reduced and then rot.
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Spring watermelon planting time and planting techniques are introduced here. Spring watermelons should strengthen management and management of key temperature, humidity, fertilizer and water preservation, and promote crop growth and development.
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