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Overwintering small watermelon seedlings
Winter-style multi-functional greenhouses for planting high-grade watermelons are generally marketed before and after the Spring Festival. The price is the best. Therefore, sowing time is generally suitable from September to mid-October. Grafting watermelon to grasp the following links: Preparation of nutritious soil nutrient soil can be used 3 fertile mature soil, a decomposed circle fertilizer, per cubic meter of nutrient soil and then added 1.5 kg of superphosphate, 10 kg of plant ash, plus 2.5% 50 grams of trichlorfon powder and 100 grams of 50% carbendazim powder were used for insecticidal and sterilizing. The nutritious soil was loaded into a 10-cm-diameter, 100-cm-high nutrient bowl and placed in a seedbed. Select rootstock grafted watermelon should be selected with watermelon affinity, disease resistance, does not affect the quality of watermelon black pumpkin or zucchini, etc. as the rootstock. Soak the seeds with hot water three times more than the rootstock pumpkin seeds. Stir the seeds for 3-5 seconds and immediately add the same dose of cold water to bring the water temperature below 30°C. After soaking for 30 hours, the seeds were germinated with a damp cloth at 28°C to 30°C. When the seeds are white, 1 tablet per pot, 1.5 centimeters of cover soil, when the seedlings are out, soak watermelon seeds; put the watermelon seeds in warm water of 55°C, stir for 15 minutes, cool and soak for 5-6 hours, put Place germination at 28°C to 30°C and sow seeds after sowing. Species 1 cm, cover soil 1.5 cm. Grafting method used in grafted watermelons includes docking method, docking method, splicing method, etc. The plugging method is the most convenient method. Grafting is appropriate: the first true leaf of rootstock seedlings appears to have just begun. Watermelon seedlings can be grafted before cotyledons are first displayed until Ye Gangping shows up. The management of grafted seedlings is controlled at about 25°C during the day. The maximum temperature does not exceed 30°C and it is about 20°C at night. During the period of enclosure, the relative humidity in the seedbed should be maintained at 100%, and small winds can be passed after 3 days. After 7 days, the amount of ventilation should be increased. If grafted seedlings appear wilting, they must be shaded in time. After the seedlings have survived, check and remove buds sprouting on the rootstock at any time to prevent the growth of the scion. Seedlings to prevent the occurrence of pests and diseases, can be used streptomycin, aphids clear spray seedbed to prevent pests. When the seedlings grow to 2 leaves and 1 heart, they can be transplanted and planted.