Autumn watermelon cultivation techniques
Select the appropriate varieties: Better performance: Xiaolan, Black Beauty, Early Spring, Red Jade and Jingxin. Soil preparation and fertilization: Generally, the depth of cultivation is 30 to 40 cm, combined with 1/15 hectares of soil preparation and 3,000 kg of chicken manure, 30 kg of compound fertilizer, and 20 kg of urea. Timely sowing: sowing at the end of June or early July, use gourds as root stocks, first broadcast gourds, and then broadcast watermelons when two cotyledons of gourd seedlings are spread out. Grafted seedlings management: When the two pieces of watermelon cotyledons are unfolded, the first true leaf of the gourd is unfolded and then grafted with a knot. The grafted seedlings were placed in the shed, the roof was covered with a shading net, and an insect-proof net was placed around it. 3 days after grafting, the grass cover was shaded. After 3 days, the grasshopper was gradually removed, and the temperature in the shed was controlled at 24°C to 30°C. 7 days before the planting, the shading nets were gradually lifted and the seedlings were vigorously promoted. Timely colonization: Planting in the middle of July, planting about 1/15 hectares of about 900 plants and covering the sheds after planting. Strengthen the management of the field: control the humidity, cover the shed film before rain, prevent the rain from entering the shed, if the drought can water. The air humidity in the shed is controlled at about 60%, and the initial period of colonization is about 80%. Excessive air humidity will increase ventilation. Adjusting the temperature is mainly achieved by uncovering the haystack and ventilation measures. 3 to 6 days after planting, appropriate cover grass cover shading, the temperature is controlled at 26 °C ~ 30 °C, extend the vine control period at 24 °C ~ 30 °C, the result period is maintained at 24 °C ~ 35 °C, try to increase the temperature difference between day and night To improve the quality of watermelon. After the melons are combined with watering, 1/15 hectares of mu will be applied with 10 kg of urea and 15 kg of potassium sulfate. Generally, 3 vines are left in the plant, 1 main and 2 sides. In order to ensure that it is sitting on time, artificial pollination should be performed at 7 to 9 every day. Pest control: Anthrax can be treated with mancozeb, thiophanate-methyl, carbendazim, etc. Virus disease can be controlled by virus A, phytophthora, etc. Aphids, whitefly, etc. can be controlled by imidacloprid, omethoate, etc.