Efficient planting of two kinds of broccoli

The medium and early maturing varieties, such as excellent, landscape, etc., were selected for plug substrate seedling. Fill the holes of the 128-hole polyethylene plastic tray with the finished substrate, flatten and gently compact the tray surface, lay flat on the bed surface, pour proper amount of water, sow one seed in each hole after 2 - 4 hours, sprinkle a small amount of carbendazim soil, pour water thoroughly, cover a small amount of culture soil, and cover the seed. When the substrate is dry, a small amount of water needs to be poured, and after the seedlings are fine, water should be poured once a day at 9 - 10 am, and the amount of watering should be moderate. Gradually increase ventilation 5~7 days before planting, gradually reduce watering 3~4 days before planting, spray 75% chlorothalonil 800 times solution once a day before seedling emergence. Temperature management of seedling shed: keep 20~30℃ in daytime and 15~20℃ at night before seedling emergence; 20~25℃ in daytime and 15~18℃ at night after full seedling; 20~25℃ in daytime and 13~ 18 ℃ at night after the first true leaf appears; gradually reduce the day and night temperature of seedbed 5~7 days before planting, 15~20℃ in daytime and 10~12℃ at night; cover sunshade net to cool down when the temperature of seedling shed is higher than 30℃, and gradually remove sunshade net 7~10 days before planting. 10 - 25 days before planting, ploughing the soil, applying enough base fertilizer, applying biological organic fertilizer 120 kg, ternary compound fertilizer (20-10-16) 40 - 50 kg, calcium superphosphate 80 kg, borax 1.5 kg per mu, rotating the fertilizer into the soil and making beds. Planting after 3 p.m. on sunny days, planting all day on cloudy days, staggered planting between rows on the ridge surface, in the shape of "pin", planting about 4200 plants per mu, planting depth of 4~5 cm, planting holes sealed with soil and slightly pressed, preventing seedling lumps from connecting with soil. On the day after planting, irrigate enough root-fixing water and fully soak the soil. Fertilizer and water management in case of summer drought appropriate irrigation, irrigation can run horse water, only require soil moisture, can not flood irrigation. Cultivate soil and weed in time after each irrigation. 5~7 days after planting, apply the first topdressing, urea 6~8 kg/mu; 25~35 days after planting, when the plant has 8~10 true leaves, apply the second topdressing, ternary compound fertilizer (20-10-16) 15~20 kg/mu; 45~55 days after planting, when the plant has 15~17 true leaves, apply the third topdressing, ternary compound fertilizer 15~20 kg/mu. Topdressing in the middle of the two holes, hole depth 8~10 cm, after application with soil cover tightly. The main diseases to control broccoli are blight, downy mildew, black rot, etc. The main pests are aphid, cabbage worm, beet armyworm, cutworm, etc. Pay attention to chemical control. After the emergence of young flower bulbs, drug use is prohibited. Timely harvest sunny days 9 - 10 am or 4 pm harvest, rainy days do not harvest, harvest once a day. When harvesting, the knife should be accurate and stable, and 3~4 leaves should be retained. The transverse diameter of flower bulb for fresh keeping and export is 11~14 cm, and the longitudinal stem length is 15~16 cm; the transverse diameter of flower bulb for quick-frozen processing is 16~18 cm, and the longitudinal stem length is 16 cm; the transverse diameter and longitudinal stem length of flower bulb for domestic sales shall not exceed 12 cm.