First, choose the variety. Early spring cold shed cultivation can use varieties with strong cold resistance, strong disease resistance and strong winter, such as Qiujin and Huifeng No.1. In the spring open field planting, we can use varieties such as Zhonggan 15, Zhonggan 21, etc., which have early maturity, high yield and strong disease resistance.
Second, prepare the seedbed. In the nursery bed soil, the soil should be fertile. In the previous year, the pastoral soil of cruciferous vegetables was not planted, and the fully decomposed farmyard manure should be used to match the appropriate amount of ternary compound fertilizer. The seedbed can be thoroughly disinfected with 50% Fumei double wettable powder before sowing, and the dosage per square meter is about 10 grams.
Third, seedbed management. Before emergence, the temperature of the greenhouse or impotence should be maintained at 15 °C ~ 25 °C. After 5 days of sowing, the seedlings can be released. At this time, it is necessary to pay attention to the wind in time to keep the temperature at 10 °C ~ 20 °C. If the seedlings are too dense, Then you need to carry out the seedlings to prevent the seedlings from growing. When the seedlings grow to 3 true leaves, the seedlings should be transplanted once, and the seedlings should be transplanted into the nutrient bowl. The temperature of the seedbed bed is generally between 8 °C and 20 °C, and the temperature can be low before the seedlings are planted in March. Refining the seedlings, gradually increasing the amount of air release, the minimum temperature of the seedbed can be gradually reduced to about 5 °C, and the refining time is about one week. After that, it is planted according to the cultivation mode and weather conditions.
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