Watershed seedlings in early spring
In early spring, watermelons in the greenhouse are often covered with a “three membranes and one bowl†insulation method, namely a small arch shed in a large arch shed, a mulch in the arch shed, and a grass cover in the outside of a small arch shed, which can be compared to the exposed watermelon for 60 days in the morning.
In the early spring of greenhouse, watermelons can be cultivated using early spring and vegetable intercropping to increase economic benefits. In early spring, the interplanting vegetable varieties can use the cold greenhouse in the southern part of the greenhouse to cultivate cold-resistant vegetables, but they must be matched with the grafted seedlings of watermelon and the colonization of greenhouses. If you grow cabbage, you can raise the seedlings in the greenhouse in mid-December. You can choose early-maturing varieties such as Zhong 11 and Zhonggan 12; you can also cultivate early-maturing cauliflowers such as Baifeng and other varieties; if you are planting lettuce, you can choose sharp-leaved bamboo shoots. Wild geese and other early maturing varieties. The above three kinds of early-maturing vegetables, nursed to 6 to 8 leaves, planting in mid-February, can be harvested by mid-April. Live fennel, spinach, spring radish and early ripe radish can also be lived in the greenhouse. The introduction is as follows:
I. Variety selection
Select early-maturing or medium-early-maturing varieties, and should have low temperature elongation and good low temperature results, more resistant to damp and humid environment, suitable for grafting cultivation and have high quality, disease resistance, high yield and other characteristics. The more suitable varieties are Jingxin No.1, early mature Prince, Royal Highness and so on.
Second, seed processing
Seed disinfection before sowing. First soak in 0.1% to 0.2% potassium permanganate solution for 30 minutes, then wash with water, and then put the seeds into warm water at 55°C. Stir quickly to room temperature and dip for 6 to 8 hours. Also use 50% carbendazim. Wettable powder 500 times liquid soaking for 1 hour, wash with water, and then soaking in warm water at 30 °C for 8 hours, placed at 28 °C ~ 30 °C under the conditions of germination, germinated seed coat exposed (Lubai) can be sown.
Third, nursery
Usually from January to early February sowing, seedling needs 35 to 40 days. The nutrient soil preparation may take 5 parts of field fertilizer, 4 parts of sheep manure and 1 part of slag, and add 2.5 kg of superphosphate and 0.75 kg of urea per cubic meter of nutrient soil, and then disinfect with 2 kg of carbendazim. After the nutrient soil has been infiltrated with water, seeds soaked with germination can be sowed. Seeding to the emergence of a higher temperature, in the greenhouse can be covered with a small arch shed, the daytime temperature is controlled at 25 °C ~ 30 °C, night 10 °C ~ 18 °C, night or shade snow cover straw. After 50% to 70% of the seedlings are excavated, they are maintained at 25°C to 28°C during the day and 10°C to 18°C ​​at night. After the seedling grows out of the heart, the daytime temperature is maintained at 20°C to 30°C and nighttime at 10°C to 15°C. The bed remains moist. Spray 500 times carbendazim solution before planting to prevent disease.
IV. Site preparation
Deep plowing 20 to 25 cm, 2 to 3 cubic meters of chicken manure per mu of ditch, 150 kg of phosphate fertilizer, 250 kg of sesame cake (or cottonseed cake), 20 kg of urea, and deep ditching.
When the temperature in the greenhouse is stable above 7°C and the ground temperature is stable at 10°C above 12°C, it can be planted on sunny mornings. Planting when the general melon seedlings 4 leaf 1 heart (40 to 50 days of seedling age), planting 800 to 1000 per acre, line spacing 180 cm 40 to 50 cm, after planting cover film, and then deducted a small shed, and covered grasshopper. After planting, pour water once. Note that when grafting grafted seedlings, the interface must be kept above the ground to prevent the occurrence of adventitious roots.
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