Field management of radish cultivation with rich nutrition and demand

White radish is rich in nutrition and contains a variety of trace elements. Regular eating can enhance human immunity and inhibit the growth of cancer cells. Potassium, magnesium and other minerals in radish and B vitamins can promote gastrointestinal peristalsis and help to eliminate waste in the body.

White radish seedlings

1 preparation before sowing: plant white radish and choose a greenhouse that has not planted cruciferous vegetables in the past two years. After the previous harvest, the residual plants, rotten leaves and weeds were cleared out of the shed in time and concentrated on harmless treatment such as high-temperature composting to reduce the source of infection of diseases and insect pests. Apply more than 4 000 kg of fully mature fine broken organic fertilizer, or more than 2 000 kg of commercial organic fertilizer, do not apply unmature fertilizer, and mix well with the soil. After fertilization, 250 grams of sulfur powder and 1 000 grams of dry sawdust were mixed and ignited, and the doors and vents were sealed for greenhouse disinfection.

(2) sowing: the amount of seed used per mu is 80,150g. The plant spacing is 20cm, the row spacing is 45~55cm, and the planting density per mu is 5 500 Mel 6 500 plants. Hole sowing method was used to punch holes in plastic film, and then sow seeds. 2 seeds were planted in each hole, and the soil was covered with thick 1.5cm. After covering the soil, the seeds were pressed slightly to ensure that the seeds were closely bound to the soil.

3Seedling stage management: the seedlings should be checked once 6 days after sowing. If the seedlings are missing and ridges are broken, the seedlings should be replanted immediately. The seedlings were carried out when the radish cotyledons were fully expanded, the true leaves were exposed, and the seedlings were fixed when there were 3 or 4 true leaves. Leave one plant in each hole to get rid of sick seedlings and weak seedlings. From seedling emergence to ridge closure, the soil should be ploughed and loosened for 2 or 3 times in order to increase the soil temperature and promote the growth of young roots.

4Leaf vigorous growth period management: mainly to control moisture, ploughing and squatting seedlings, the specific squatting time should be determined according to the climate and soil conditions, generally at 12-15 days, and the squatting time should be shortened in sandy soil and drought. It is 18: 22 ℃ during the day and 10: 12 ℃ at night, and the light should be increased, especially in winter and spring, scrubbing the greenhouse film every day to improve the light transmittance of the greenhouse film and make the radish see more light.

5 Management of fleshy root expansion period: after radish shoulder exposure, the soil should be kept moist, the soil should be dry and wet, small water should be watered frequently, and excessive drought and flood irrigation should be avoided. Timely and appropriate watering is an important measure to ensure the appearance and taste quality of white radish, and stop watering one week before harvest. The optimum temperature is 18: 22 ℃ in daytime, 10: 12 ℃ at night, and the ground temperature is 13: 18 ℃. Summer and autumn through the wind, covering the sunshade net, watering and other measures to cool down, do a good job of heat preservation and cold protection in winter. In terms of light, it requires sufficient light, strong photosynthesis, more material accumulation, rapid expansion of fleshy roots and high yield. Increase the light time and intensity as much as possible in winter. When the base fertilizer is fully applied, it is no longer topdressing, but some boron fertilizer can be applied along with the water to prevent the root from cracking. If the amount of base fertilizer is small, the fully mature organic fertilizer can be applied once with water at the beginning of the rhizome expansion period, 300-500 kg per mu; if there are drip irrigation facilities, 10 kg of nitrogen, phosphorus and potassium can be applied per mu with 40% water. During the whole growth period, foliar fertilizer was sprayed 3 times for 5 times, and 0.25% borax or 0.3% potassium dihydrogen phosphate plus 0.5% urea could be used.

6 harvest: the harvest time of white radish is generally after the fleshy root is fully dilated as the harvest time, which affects the yield too early, increases the fiber too late, is easy to produce split root and bran heart, and reduces the commerciality. The fleshy root can be harvested one after another when the diameter of the fleshy root is more than 5cm. When harvesting, the petiole is left 7~10cm to be cut off, cleaned and sold. Pay attention to handling gently during harvest to prevent damage to the fleshy root.