The mulching of spring cabbage in Gu'an County and Luzhou City has begun to enter the rosette stage and is also a key stage for the growth of Chinese cabbage in early spring. It takes only about 20 days from the mature market to strengthen management and ensure the harvest of Chinese cabbage.

First, according to the weather and temperature changes, timely cooling of early spring cabbage

Cabbage is a warm and cold-tolerant vegetable. The optimum temperature for growth from rosette stage to bulbous stage is about 16°C. The maximum temperature after mid-April can reach 25°C, and the temperature under plastic film can reach above 35°C. When the Chinese cabbage grows in high temperature, it can cause the cabbage growth leaves to bake, which hinders the normal growth of Chinese cabbage. At this time, we must pay close attention to the changes in the weather. When the temperature is high, sunny weather should be released in due course, and the temperature should be lowered to prevent direct sunlight from causing baking and dry leaves.

Second, timely fertilization

During the period from rosette stage to ball stage, the Chinese cabbage needs to increase the amount of fertilizer, and it is necessary to apply fertilizers rationally, and the ratio of N, P and K should be moderate. The ratio of N, P and K fertilization during rosette stage should be 2:1:6. At this time, potassium is most needed. The suitable ratio of nitrogen, phosphorus and potassium during the ball stage is 2.3:1.2:4.5. Some calcium fertilizer and magnesium fertilizer should be added in due time. Fine fertilizer. Remember not to overdo it with nitrogenous fertilizers such as urea, ammonium bicarbonate, ammonium sulfate, ammonium chloride, etc. Excessive application of nitrogen fertilizer can greatly increase the incidence of dry heartburn in Chinese cabbage.

Third, strengthen management to prevent bolting and flowering

The day-to-day management of Chinese cabbage should be strengthened, including timely prevention of pests and diseases, prevention of diseases such as soft rot of Chinese cabbage, active control of locusts, timely watering, less pouring, proper fertilization, and appropriate application of phosphate to Chinese cabbage. Potassium hydrogen promotes the growth of Chinese cabbage and achieves early maturation.

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