First, adjust the temperature. The seedling temperature was maintained at about 35°C within 3 days after seedlings went to bed. Under normal circumstances, clearing the grass in the sunny morning sun film warming, 3-4 pm cover grass rake insulation. Before emergence, the temperature of the bed should be maintained at 30°C-32°C. After emergence, the temperature of the seedlings will gradually decrease to about 25°C. Before the picking, low-temperature seedlings are required to reduce the bed temperature to 20°C-22°C. One or two days after picking, it is necessary to increase the temperature and keep warm to facilitate the sprouting of new buds to promote the long-term growth of the alfalfa, and then to carry out the low-temperature hardening of the seedlings, generally 5-6 days.
Second, pouring good water. Seed potatoes are generally not watered before emergence, based on the fact that the seed potato is poured on the bed. If the seedbed is too dry, spray water can be sprayed on the seedbed. After pouring out the seedlings, before hardening the seedlings, and on the second day after picking, pour the water one time. Between the two big waters, according to the growth of the potato seedlings and the soil of the bed soil, the small water is poured lightly and uniformly poured. In early spring, the temperature is low, watering in the morning, raising the temperature at noon, and the temperature can be raised in the afternoon to prevent the bed temperature from being too low at night. The higher temperature in the later period is suitable for watering in the afternoon to prevent the nighttime temperature from being too high and the potato seedlings grow fast and tender.
Third, refining a good seedlings. After the potato seedlings are in full bloom, they select sunny weather and begin to gradually ventilate to gradually lower the temperature of the bed so as to help the seedlings grow steadily and prevent the appearance of thin high seedlings. When the seedlings grow to 12-15 centimeters, the temperature is stable, and they can be ventilated overnight. Seedlings and films can be completely removed 2-3 days before the seedlings are harvested, allowing them to keep their seedlings up and running, which can improve the survival rate.
Fourth, catch up with fat. After each pick, combined with watering to topdressing, topdressing with mainly available nitrogen fertilizer, with phosphorus and potassium fertilizers. Spread the two fertilizers evenly and spread them on the seedbed. After spreading, the fertilizer on the seedlings will be gently knocked down and then rinsed with water.
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