In the central and southern parts of Guizhou, early season, small sheds are used to grow early-maturing cabbage. Generally, the strong seedlings cultivated in the middle and mid-February are planted in small arch sheds, and they can be harvested in mid-May and can not only fill the gaps in the early summer vegetable market. It does not affect the growth of summer crops and effectively increase farmers' income. The management points after the planting is now described as follows:
One, timely transplanting
In mid-February, when the temperature of 10 centimeters in the shed is stable above 5 degrees Celsius, the temperature can be set at above 8 degrees Celsius. Choose 3 to 5 days of continuous high temperature weather, the seedlings cultivated in advance will be planted into the middle of the ridge, the depth is not to bury five pods is appropriate, the row spacing is 40 cm, the average planting seedlings per acre 3500 ~ 4000 strains. After the planting is completed, the sloping furrows in the ridge ditch should be poured. To prevent the water temperature from being too low and the amount of watering is too large, the temperature in the shed is too low and the ground cracks are caused. As a result, the seedlings die. The deep well water should be poured, and the amount of water for irrigation is mostly ditch water. should. After pouring the sapling water, the greenhouse film was closed for 15 to 20 days for easing seedlings and seedlings.
Second, field management
1. Water and fertilizer management. 15 to 20 days after planting, according to the soil moisture and seedling growth, along the ridge ditch a small water, while applying 15 kg of urea per acre, in order to promote rapid growth of plants. After the ground is slightly dry, a cultivating and weeding process is performed. The cultivating depth is 3 to 4 cm and the soil is promoted to aerate. Into the ball stage, combined with watering, topdressing low-nitrogen-high-phosphorus high-potassium compound fertilizer 20 kg per acre, after every 7 to 10 days pouring a small water, keep the soil see dry see wet. Watering should be stopped 5 to 7 days before harvesting so as to avoid cracking and damage.
2. Temperature management. Within 15 to 20 days after cabbage is planted, the shed film is sealed and no ventilation is required. After the second watering, according to the weather conditions and seedling growth, open the shed in the sunny noon, start the appropriate amount of ventilation and cooling, so that the temperature inside the shed is maintained below 25 °C, prevent the high temperature caused by the external leaves, delay the knot ball. Close the shed at night so that the temperature inside the shed stays above 10°C. During the ball-in period, with the increase of the outside air temperature, the ventilation area and prolonged ventilation time were gradually increased, so that the maximum temperature in the shed was controlled at about 23°C.
Third, timely harvest
From the end of April to the middle of May, when the leaves are tightly held and the single ball regains the characteristics of the varieties, they are collected and listed in batches according to market conditions.
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