Planting time and method of Shanghai Qing

Shanghai green is a small cabbage with few leaves and many stems. It is also called gourd-shaped white because its stems are white and look like a gourd. Its characteristic is that every leaf is emerald green, and every leaf completes the photosynthesis of chlorophyll during the growth period. It is rich in nutrients and has a crisp taste. It is a very popular vegetable. Let’s talk about the planting time and method of Shanghai green.

1. Planting time

Shanghai Qing prefers a cool climate, so it is most suitable to be planted in spring and autumn.

Spring planting: Generally, sowing is done from late February to early April. At this time, the temperature gradually warms up, which is conducive to the growth of Shanghai Qing. In the Jiangnan region, many farmers choose to start sowing in early March. At this time, the climate is warm and there is plenty of rainfall, which is very beneficial for the growth of Shanghai green. In the northern regions, due to the late rise in spring temperatures, the sowing time may be delayed to around mid-April.

Planting in autumn: The temperature in autumn is moderate, which is also very suitable for growing Shanghai green. It is usually sown from late August to early October, when the Shanghai green can grow and develop in a relatively mild climate. In northern regions, the autumn sowing time can be advanced to early August to make full use of the suitable climatic conditions in autumn.

2. Planting Method

1. Seed selection and land preparation

Choose a variety of Shanghai greens suitable for local cultivation, and make sure the seeds are full, strong and disease-free.

Choose fertile, well-drained soil for planting. Before planting, the soil should be deeply plowed to loosen the soil, weeds and stones should be removed, and sufficient organic fertilizer and compound fertilizer should be applied as base fertilizer.

2. Planting

There are two ways to sow Shanghai Green: broadcasting and row sowing. When sowing, first water the ground thoroughly, then spread the seeds evenly on the ground, cover with a thin layer of soil or fine sand, and then cover with a layer of mulch such as straw or plastic film to keep the soil moist. When sowing in rows, dig furrows according to a certain row spacing, sow seeds evenly in the furrows and cover with a thin layer of soil. Pay attention to the sowing density to be moderate. Too dense or too sparse will affect the growth of the seedlings.

3. Field management

Watering: Shanghai green requires a lot of water during its growth period, especially after emergence and during the growth period, the soil should be kept moist. However, water should not accumulate in the soil to avoid root rot or disease.

Fertilization: Shanghai green is a vegetable that requires more fertilizer, mainly nitrogen fertilizer. Fertilization should be done several times during the growth period. The concentration of fertilizer should be small in the early stage and can be appropriately increased in the later stage. Generally, decomposed organic fertilizer is sprayed once a week, and fertilization is stopped two weeks before harvest.

4. Weeding and loosening the soil

Regular weeding and loosening the soil can increase soil permeability and water permeability, and promote the root development of vegetable seedlings. Generally, weeds should be removed every 10 to 15 days and the soil should be loosened every 15 to 20 days.

Protection against cold and heat: In low or high temperature seasons, appropriate measures should be taken to protect the seedlings from frost or heat damage. For example, cover the seedlings with straw, plastic film, etc. to increase the temperature, or use shade nets to block the sunlight to reduce evaporation and cooling.

5. Pest and disease control

Common diseases of Shanghai green include downy mildew, powdery mildew and black spot, and pests include aphids, cabbage loopers and flea beetles. It is necessary to detect and prevent these diseases and pests in time to avoid affecting the growth and quality of the seedlings. Prevention and control methods include selecting disease-resistant varieties, rational crop rotation, strengthening field management, and using pesticides for spraying.

6. Harvest

The harvest period of Shanghai Green is generally 30 to 60 days after sowing, and the specific time varies depending on the variety and season. Harvesting should be done in the morning or evening to avoid damage to the seedlings caused by high temperature and strong light. When harvesting, use scissors or a knife to cut the seedlings from the roots. Do not pull out the roots to avoid damaging the root system of the seedlings. After harvesting, the fruits should be cleaned and dried in time before being packaged and transported.

That’s it