Characteristics: The outer leaves are mostly green, and the leaves have various forms depending on the variety. The autumn sowing varieties are early-maturing and mid-late-maturing varieties. The growth period ranges from 50 to 80 days. The plant type is mostly upright, the leaves are stacked and the inner leaves are brightly colored. After being cut, the sun is slightly more bright and striking. The ball is tight, the net rate is high, and the taste quality is excellent. Strong resistance to viral diseases, downy mildew and soft rot. During the growth period, the water consumption is very large, and a large amount of water is needed during the entire growth period. In the case of sufficient fertilizer and water, the output is extremely high, and the general production of 667 square meters is more than 6500--7000 kg.
Requirements for soil and environmental conditions: The roots of colored Chinese cabbage are mainly distributed in the shallow soil layer. The planting should be in fertile, loose, ventilated, water-retentive, fertilizer-conserving sandy loam soil, loam soil and light clay plots. The thickness of the soil layer should be more than 50 cm. , pH 7--7.5; requires a mild and cool climate during growth and development; micro-freezing at the seedling stage and ball stage; not high temperature resistance; when the temperature reaches 32°C, the growth is very weak, and the most suitable temperature is 10°C- -The growth temperature is about 22°C; the suitable temperature in bud and seedling stage is 20°C25°C; the light requirement is not strict, and it can grow normally under suitable low light conditions, suitable for close planting, but the light is too weak Production is reduced; vegetative growth is conducive to photosynthesis during long days of sunshine, and short days can promote balling.
Requirements for fertilizer and water conditions: Colored Chinese cabbage is a vegetable with a large amount of water, and requires less water during the germination period. Since the root system is shallow during the seedling period, it should be watered regularly. The water requirement during the rosette stage is large, but watering should be appropriate to prevent the water from passing through. Many cause appetite, affect the roots under the bar and Baoxin; need for water during the ball period increased, should be a lot of water, prompting the rapid growth of leaf ball.
Potassium uptake was greatest throughout the growth period, followed by nitrogen and calcium, and less uptake of phosphorus and magnesium. In the cultivation of colored Chinese cabbage, fertilizers should be combined with organic fertilizers and chemical fertilizers, and top dressings should be applied according to different growth stages.
Cultivation techniques: The spring cultivation should be based on the local minimum temperature of not less than 5 °C nursery or live. Autumn sow cultivation is generally planted in North China in August and in mid-August, the Yangtze River Valley is planted in late August, and South China is planted from August to November. The alpine region is due to advance from June to July. The specific time should be based on the fertility of different breeds. In the period, the best sowing time is the date when the growth period is backed by the local cold wave of -2°C or more. Premature, hot weather, susceptible to viral disease; too late, lack of growth period, affecting yield. Planting plots of 667 square meters of decomposed organic fertilizer 4000--5000 kg, 40 kg of potassium sulfate compound fertilizer as base fertilizer, deep-flushing 30 centimeters, flattening, making a high 15--20 centimeters tall, wide 1.3 About 2 meters, 2 rows per plant.
At present, such cabbage seeds are relatively rare. Whether they are imported varieties or domestic varieties, the seed prices are correspondingly higher. Therefore, most of them are mainly seedling transplanting, which not only saves money, but also ensures that the seedlings in the fields are uniform and Miao Qi is convenient. management. Breeding seedlings with 5--6 true leaves, the choice of colonization in the shade of the afternoon, with the soil as little as possible to damage the root system, according to planting distance of 50--60 cm colonization, immediately after planting watering. After easing the seedlings, the tree fat was chased once, and 667 square meters of urea was applied to 20 kg. The water was poured every 5 to 6 days to keep the soil dry and wet alternately. At the late stage of rosette growth, pour a large amount of water and seedlings to promote the development of a large number of root systems. After the start of the package, increase the topdressing, watering capacity, 667 square meters of potassium sulfate 25 kg, 20 kg of urea, ditch applied or acupuncture points. Stop watering 10 days before harvest. Throughout the growing period, special attention was paid to the damage of aphids and cabbage caterpillars, insect pests were found, and medicine was promptly controlled. To ensure normal growth during the growth period, fully increase production and obtain the best economic benefits.
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