I. Cultivation and management of protected vegetable crops The management of overwintering cucumbers, zucchini, tomatoes, and peppers in the cultivation of energy-efficient solar greenhouses should be carried out in the middle of cultivation, to increase the ground temperature and increase the air permeability, and to promote the growth of new roots. This winter is the longest duration of strong cold air since 1986, especially in mid-February, the average temperature is 2.6°C and 5.1°C lower than normal, and snowfall is also the largest in the same period in history, leading to the protection of many kinds of vegetables. Diseases are heavier and yields are declining. Therefore, management should be combined with disease prevention for foliar dressing, spraying Yunda-120 or amino acid foliar fertilizers, or adding calcium-darin to promote growth, spraying Jin Chunbao 2000 on melon and fruit crops. For crops that are subject to freezing or weaker growth (roots roots), they must be replaced as soon as possible to increase spring production. Second, pest control This year due to low temperatures, cloudy days, gray mold, leaf mold, downy mildew, early blight, late blight, root rot occurs more commonly, can spray broad-spectrum fungicides 50% safety Grams, 53.8% can be killed, 72% Best, 45% chlorothalonil, etc.; powdery mildew, leaf spot, brown spot can be sprayed with 43% Halonic, 5% Tsui, 50% Mito Bujin or 25% buproflone ​​can effectively prevent and control diseases. Insect pests include aphids, whiteflies, and tea aphids (green leafhoppers). As the temperature rises, the rate of reproduction increases, and it is discovered in a timely manner that 2 to 3 consecutive sprayings are performed to completely eliminate the increase in ventilation and spread to the open air. More harmful, can be sprayed to remove 10%, 25% scorpion, 3% acetamiprid and other pesticides, spray 4 to 5 days, several pesticides alternately, as a preventive drug can be sprayed 7 to 10 days, Can effectively prevent the occurrence of pests and diseases. Third, sowing and planting in early March sowing spring spinach, varieties are Japan's all-powerful spinach, round-grain big-leaf spinach, pineapple miscellaneous series; Yucai rapeseed varieties have Pingjing No. 6, Nongda Xueyu Wang (Henan) before sowing after sowing Covering the film; in mid-March, small and medium-sized shed cabbages, including Jingchun, Xingchun and Chunzhenbai No.6, are cultivated in the spring of March, and the varieties are Jinlu No.1, No.2 and No.1 Jinyou. The seedling age is about 30 days. Live radish can also be broadcast live, such as early spring big root, white jade spring and other varieties. For watermelons, cucurbits, tomatoes and other crops planted late in large and medium arch sheds, late planting due to cold weather, seedlings with excessive seedling age, planting ditch, pouring small water, planting not too deep, and preventing stem rot Promote slow seedlings.
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