Pollution-free cultivation technology of autumn and winter celery

㈠ Choose the right variety. Select California King, Gaoyouta, Ventura, Jinan, etc. which are fast growing, low temperature resistant, and not easy to pump.

㈡ Shade nursery. In mid-July, seedling beds will be built at high altitudes and covered with shade nets. Soak the seeds in cold water for 8-12 hours before sowing, remove the drained water, and mix and spread with a fine tide soil. After sowing, tap lightly once and pour water. Keep the soil moist before emergence, and weed 2-3 times after emergence. When the height of the seedlings is 10 cm, foliar fertilizer is applied 1-2 times to promote the robust growth of the seedlings.

㈢ stubble planting. After the summer cabbage is harvested, the rotten roots of the leaves must be cleaned up, and the plots with severe disease should be disinfected by spraying corresponding fungicides. Apply 4000 kilograms of organic fertilizer per mu, 50 kilograms of diammonium phosphate, 30 kilograms of potassium sulfate, 30 kilograms of superphosphate, and 1-2 kilograms of zinc sulfate. Work 15 cm deep, make flat hoe, and ditch the plants according to the row spacing of 15-20 cm and the plant spacing of 10-15 cm. Water the seedbed one day before planting to facilitate seedling growth, leaving the main root 3-5 cm long and the planting depth 3-5 cm. Water the planting water with enough water. When the heart leaves begin to grow slowly after the seedlings are irrigated, apply a small amount of water and apply 5 kg of urea or 15 kg of ammonium per mu. After that, you will squash the seedlings shallowly. When the leaves start to grow upright and the underground roots occur in large quantities, fertilizer and watering are started to keep the ground moist. When the plant was 30 cm high, it started spraying 50 mg / kg gibberellin, spraying every 10-15 days, combined with watering and topdressing.

㈣ Harvest. For harvesting, when the plant has 4-5 large leaves, 2-3 leaves can be taken from each plant, and fertilized and watered on the second day after harvest. Harvested at one time, at 40-50 cm plant height.

㈤ Prevent diseases and insects. To prevent leaf spot, foliar spraying with methyltobutin or carbendazim can be applied; after closing the shed, aerosol can be applied. To control aphids, spray with imidacloprid or pyrethroid pesticides.

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