In the past two years, Qinyi Farming Field, Heqing Town, Pudong New Area, Shanghai has cultivated early-spring Chinese cabbage in reverse season, which has achieved good economic benefits. In 2007, 2.5 mu of early spring Chinese cabbage was planted, with a yield of 5,400 kg and an output value of 11,000 yuan per mu.
Variety selection of early-maturing disease resistant varieties Yangchun resistant to low temperature, resistant to early twitching.
Early sowing should be carried out as early as possible to ensure normal growth of cabbage and no early convulsions. According to the characteristics of the climate in January-February of the past two years, it was determined that sowing in mid-January, compared with conventional production sowing time is about 40 days earlier.
Warming and raising seedlings in the middle and late January are at a low temperature and a cold season. Focus should be placed on heat preservation and seedling raising. Use greenhouses, small sheds, plastic film and non-woven fabrics, a three-film insulation cloth nursery. Select sowing at high temperature during sunny days and fill in nutritious soil in a special dish for vegetables. One seed per seed is planted. The nutrient soil was prepared at a ratio of 4:6 of decomposed organic fertilizer and pastoral soil. Pouring sufficient water before sowing, cover the nutritious soil after sowing, to cover the seeds for the degree. The seedling trays are arranged according to the width of the small arch shed, and a warming line is laid between the seedling tray and the seedbed at intervals of 25-30 cm. Immediately after sowing, cover the film, take a small shed, and cover the non-woven fabric. Keep seedbeds at high temperatures during nursery and promote early emergence. Pre-emergence, seedling period and temperature below 9 °C, timely heating equipment to warm the ground.
Timely planting seedlings 3 leaves 1 heart to 4 leaf selection fine weather high temperature time transplanting. The 6-meter-wide greenhouse is divided into 3 sections, with a width of 1.6-1.8 meters, each row is planted with 4 rows, spacing is 50 centimeters, the spacing of plants is 35-40 centimeters, and 3700-3800 plants per mu. Before the planting, lay a plastic film, water it properly after planting, and timely cover the small arch film. Depending on the weather and temperature changes, the non-woven fabrics are insulated. After transplanting (from early February to early March), non-woven fabrics are added at night.
After fertilization and temperature control, the management is mainly based on heat preservation and fertilizer promotion. Before the planting, apply base fertilizer, 1,000 kg of organic fertilizer for each acre, and 50 kg of BB fertilizer for vegetables. After 10 o'clock on the sunny day, the small arch film was uncovered, and it was timely covered before sunset. In case of low temperature and non-woven insulation, the small arch film was used until the middle of harvest (mid-March).
The main diseases and diseases are virus disease, downy mildew and soft rot. Prevention and control measures: First, use good weather to open the greenhouse in time to open the door and lift the membrane to reduce the humidity and improve the resistance of the seedlings; second is to select the appropriate weather time spray fungicide to prevent the occurrence of disease, found that soft rot strains timely removal, and bring out Outside the shed.
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