(1) Cropping seedlings in intertillage. After slow seedling cultivation, intertillage and loosen the soil 1 ~ 2 times, and then control watering and "squatting seedlings" 10 days to improve the ground temperature, which is beneficial to root growth. Combined with intertillage, weeds can also be pulled out manually without using herbicides, otherwise it will pollute products and soil.

(2) water. After squatting down, water the seedlings in time, water them evenly when the bulbs begin to swell, and keep the soil moist often, especially with a small amount of water. Don't drown with water. If the moisture is uneven, the bulb epidermis will crack or deform. When the heart leaves stop growing, they will be close to maturity. At this time, stop watering.

(3) topdressing. If the basal fertilizer is applied less, it should be topdressing twice when the bulb begins to swell; If the base fertilizer is sufficient, you can chase it once. Apply 200 kg of active organic fertilizer or 500 ~ 800 kg of decomposed fine quality organic fertilizer to each acre. After fertilization, water should be combined to ensure that the soil is moist and the fertilizer is well absorbed. Foliage fertilizer should be sprayed 2-3 times during the growth period, which can be mixed with potassium dihydrogen phosphate with a concentration of 3/1000 and urea with a concentration of 3/1000. Try to spray it on the back of leaves, when the temperature is high at noon and the sun is too strong.

(4) Adjust the temperature. Proper temperature should be adjusted for planting in protected areas, which is generally controlled at 20 ~ 25℃ during the day and around 10℃ at night. More measures should be taken to increase temperature and keep warm in winter and spring, more measures should be taken to reduce temperature in summer and autumn, and ventilation should be done in time in the morning and evening.