In the central and southern parts of Guizhou, early-spring cultivation of early-maturing cabbages is carried out in small arch sheds. Generally, the cultivated strong seedlings are transplanted into small arch sheds in mid-February, and mature harvests can be completed in mid-May, which can not only fill the gaps in the vegetable market in early summer. Moreover, it does not affect the growth of summer crops and effectively increase farmers' income. The management points after its establishment are described as follows:
First, timely transplanting
In the middle of February, when the temperature of 10 cm in the shed is stable above 5 °C, the temperature can be fixed when it is above 8 °C. When you choose to have 3 to 5 days of sunny and hot weather, you will plant the strong seedlings in advance in the middle of the ridge. The depth is not to bury the five-row stocks. The row spacing is 40 cm, and the average planting seedlings per acre is 3500~ 4000 strains. After the completion of the planting, the seedling water is poured in the ridge and furrow. In order to prevent the water temperature from being too low and the watering amount is too large, the temperature in the shed is too low and the ground cracks, resulting in the death of the seedlings. The deep well water should be poured, and the watering amount is mostly should. After pouring the slow seedling water, the greenhouse film is closed for 15 to 20 days, and the seedlings and seedlings are planted.
Second, field management
1. Water and fertilizer management. 15 to 20 days after planting, according to soil moisture and seedling growth, a small water is poured in the ridge and furrow, and 15 kg of urea is applied per acre to promote rapid plant growth. After the ground is slightly dried, a cultivating and weeding is carried out, and the depth of cultivating is 3 to 4 cm, which promotes soil ventilation. Enter the ball-forming period, combined with watering, apply 20 kg of low-nitrogen, high-phosphorus and high-potassium compound fertilizer per acre, and then pour a small amount of water every 7-10 days to keep the soil dry and wet. Stop watering 5 to 7 days before harvesting to avoid splitting balls and cause losses.
2. Temperature management. Within 15 to 20 days after the planting of cabbage, the membrane is sealed and ventilation is not required. After the second watering, according to the weather conditions and seedling growth, open the shed at noon on a sunny day, start the appropriate amount of ventilation and cool down, keep the temperature inside the shed below 25 °C, prevent the high temperature from causing the outer leaves to grow, delay the knot ball. Close the shed at night to keep the temperature inside the shed above 10 °C. During the ball-forming period, as the outside temperature increases, the ventilation area is gradually increased and the ventilation time is prolonged, so that the maximum temperature in the shed is controlled at about 23 °C.
Third, timely harvest
From late April to mid-May, when the ball is tight and the single ball is heavy, the market is harvested in batches according to market conditions.
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