What are the planting techniques and planting time of Chinese cabbage?

Spring cabbage is sown in winter and planted in spring. In northern China, seedlings are usually sown in early February at the end of 1 month, and sown in the fields in early May. Summer cabbage is sown in the first half of May and in June. Autumn cabbage is the main planting season. Generally, sowing begins in the middle and late June, and it is sown in July and August, with high yield. Winter cabbage is sown in early August and September.

The cultivation method of cabbage:

First, cultivate strong seedlings.

Before sowing cabbage, mix the seeds with sand, and then sow. The seedbed should be thoroughly watered first, and then covered with a thin layer of soil after sowing. Seedling in winter and spring, covered with plastic film for heat preservation and moisture retention, covered with sunshade net in summer and autumn to keep the soil moist, and uncovered after seedling emergence. Keep the soil moist and pay attention to the prevention and control of pests and diseases when raising Chinese cabbage seedlings.

Second, colonization.

Cabbage can be planted when it grows to six or seven leaves, and it can be planted in the field with large clods to reduce root damage. The base fertilizer is 5000 Jin of farm manure and 50~60 Jin of compound fertilizer per mu, which can be planted after soil preparation. After the Chinese cabbage is planted, it should be watered immediately to promote the delay of emergence.

Third, on-site management

1, water

After planting Chinese cabbage, it takes about a week to water it in time in case of drought. After the delay of Chinese cabbage seedlings, proper squatting can promote the root system to bind. Chinese cabbage needs more water to keep the soil moist when it enters the heading stage and heading stage, which is beneficial to heading. Planting and watering in high temperature period should be carried out in the morning or evening.

2. Surface treatment

Chinese cabbage needs topdressing for 3~4 times from planting to harvesting, especially after heading, which has fast growth and abundant nutrients. When watering after slow sowing, urea 10 ~ 15 kg can be used per mu. For the second topdressing in the early stage of the rosette, 30 kg of urea can be applied per mu, and potassium sulfate 10 kg can be added. The third topdressing was carried out at the initial stage of pelletizing, and urea and potassium sulfate were also used. If cabbage lacks fertilizer in the middle of heading, it should be topdressing again 15 days before harvest.

3. Utilization of trace elements

Chinese cabbage likes calcium and needs more calcium. Calcium deficiency can cause heartburn, rotten leaves and rotten hearts. When boron is deficient, the tip of the leaf bulb is stunted. In the early stage of pelletizing, calcium chelate and borax solution can be sprayed continuously for 2~3 times to prevent boron and calcium deficiency, promote pelletizing and improve yield and quality.

4. Prevention and control of pests and diseases

Common pests on Chinese cabbage include Pieris rapae and Plutella xylostella, which are more serious when planted in summer and autumn, affecting pilling and increasing the occurrence of soft rot. The use of beta-cypermethrin and emamectin benzoate in the prevention and control has the advantages of fast insecticidal speed and long duration. By spraying chemicals such as chlorobromoisocyanuric acid and Chunlei Wang Tong, the control was mainly carried out at the petiole and stem base of the base.