First, choose a thoroughbred. Now planting celery and growing it in the greenhouse is a cultivation project with strong adaptability, simple technical operation, high yield, good efficiency, and easy promotion in large areas.

Second, nurture strong seedlings. Flat seeding (strip) sowing method, generally 7 meters long and 1.5 meters wide. Before the dumplings were combined with deep plowing, 30 kg of farmyard manure was used for composting, and 65 kg of diammonium phosphate was used for each plot. The seeding rate was 50 g per loquat, and 667 m2 required a nursery area of ​​60 m2. After planting, shade and moisture management should be done to facilitate seedlings and keep the surface wet. After the emergence of seedlings to maintain the wet see dryness. After the heavy rain, timely drainage, to prevent the area of ​​water dead seedlings, seedlings 2 to 3 leaf stage l ~ 2 times thin seedlings, seedling distance 2 ~ 3 cm, seedling age 50 ~ 60 days, plant height 15 ~ 20 cm, 6 ~ 7 true leaves, stem base diameter of about 0.5 cm, to achieve strong seedling standards.

Third, rational dense planting. Only by cultivating healthy individual plants and coordinating the relationship between groups and individuals can we give full play to the group's increase in production. Since climatic conditions at this stage are very conducive to the growth of celery, in order to prevent leggy, seedlings must be taken to control the promotion of root growth and stem base thickening. The first time the seedlings were controlled mainly by water, generally pouring water once every 7 days or so, and maintaining the level of wetness seen on the surface without cracking. The second time the seedlings were controlled mainly by temperature, supplemented by water control. Doing a good job in ventilation and temperature reduction in the initial period of the shed film, especially prohibiting the temperature in the penthouse in the middle of the night to be too high. The general daytime 18 °C ~ 20 °C, night 12 °C ~ 15 °C. Through the seedlings, the diameter of the base of the plant reached 1.5 cm, and a high-yielding skeleton was established.

Fourth, reapply base fertilizer. Increasing basic fertilizer, fertility and improving physical and chemical properties of soil are the main measures for celery to obtain high yield for many years. Before planting, combined with deep-trimmed soil preparation, per 667 m2 of decomposed chicken manure, pig dung and other quality farmhouse fertilizers of 10 cubic meters, and 50 kg of diammonium phosphate, 25 kg of potassium sulfate. After 15 days of easing, the top dressing is usually combined with irrigation for 1 time. It is advisable to use alternating N fertilizer and P and K fertilizers.

Fifth, adjust the temperature and light. Celery is a cold-tolerant vegetable, but it twitches through the photoperiod under low-temperature and long-day conditions, so it is extremely important to strengthen lighting and temperature management. The winter production and management of greenhouse celery should adopt early dismantling grasshoppers and late grass cover, and clean the film surface in time, so as to facilitate warming and insulation, steal light and increase light transmittance. White Heaven's temperature is maintained at 15°C~25°C, nighttime is 10°C~15°C, minimum is not less than 5°C.

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