High-yield Cultivation Techniques of Watermelon in Greenhouse

According to different consumer markets, different varieties can be selected. Varieties should be selected suitable for greenhouse cultivation that are resistant to low temperature and high humidity, but also high-quality, disease-resistant, and high-yield, such as Japanese sweet treasure, Jingxin, Toyota Marie and so on.

2. Soil preparation and fertilization

Watermelons in greenhouses are generally planted at a higher density, so land preparation should be fine. Generally use small high ridge or high border cultivation, 2.8-3.2 meters between the arch canopy supports, planting double rows in the middle, planting 650-700 acres, pruning three vines, and leaving 1 melon per plant. When ground viticulture is used, it can be used for north-south borders.

3. Greenhouse nursery technology

Seeds of watermelon and rootstock can be soaked in clean water at 55℃-60℃, sown after germination, and disinfect the seedbed and nutrient soil. When the watermelon seedlings grow until the cotyledons are flat, and when the true leaves of the pumpkin rootstock seedlings grow to the size of soybeans, they are grafted by inserting or docking. When the grafted watermelon seedlings grow to 4-5 true leaves, perform low temperature exercise. Grab it in early March. Colonization on sunny days.

4. Field management after planting

After planting watermelon in a greenhouse, it is mainly integrated management of fertilizer, water, temperature and humidity, and gas regulation.

1. Pollution-free formula fertilization

(1) Application of base fertilizer: 4-5 cubic meters of high-quality barn manure or 3000-4000 kilograms of fully decomposed chicken manure, 150 kilograms of cake fertilizer, and 25-30 kilograms of potassium sulfate per mu.

(2) Reasonable top dressing: On the basis of applying basic fertilizer, according to the characteristics of plant growth and development, lightly apply seedling fertilizer, cleverly apply vine fertilizer, and reapply expanded melon fertilizer to meet the needs of watermelon growth and fruiting.

(3) Foliar fertilization: In the middle and late stages of watermelon growth, 0.3% potassium dihydrogen phosphate solution can be sprayed on the foliage.

2. Temperature and humidity management in the greenhouse

(1) Temperature management: Within 5-7 days after setting the value, pay attention to raising the ground temperature and keep it above 27°C to promote slower seedlings. During the blooming season of the watermelon in the greenhouse, sufficient sunlight and high night temperature should be maintained to prevent excessive temperature difference and excessive day temperature, which may lead to deterioration of fruit flesh and quality.

(2) Humidity management: The relative humidity of the air in the greenhouse is relatively high, and the air humidity can be significantly reduced under the conditions of mulching film.

3. Gas regulation

The carbon dioxide content in the air is seriously insufficient under the airtight conditions of the greenhouse and should be supplemented.

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