This year, in Gu'an, Quzhou and other places, the planting area of ​​Chinese cabbage in the early spring has further increased, but every year during the planting season, the Chinese cabbage's twitching and flowering occurs, which has a great impact on the yield and benefits of Chinese cabbage. In the season when cabbage was sown in early spring, how can farmers avoid the phenomenon of early bolting and flowering in planting?
Cruciferous vegetables such as Chinese cabbage, radish, and cabbage are easily bred and bloomed in early spring, which is determined by the growth habits of Chinese cabbage and other vegetable varieties.
Chinese cabbage needs a higher temperature in the early stage of growth and a cool and cool climate in the later period. In contrast, the climatic conditions encountered in planting Chinese cabbage in the spring are the opposite. The temperature during sowing is low. Before and after the beginning of spring, the cabbage seedlings in Gu’an are often in the spring. The seedling age is about 28 days, and it is planted on the thrilling festival (early March in each year), and the temperature is getting higher and higher in the late growth period.
Cabbage passes through the vernalization stage at low temperatures and then twitches under long day conditions. After germination, Chinese cabbage seeds can receive vernalization at low temperature at any time. The required low temperature is not strict. Most varieties can pass the vernalization stage at temperatures below 10°C for 25 days. In the early March of each year, the average temperature is below 10°C. The spring cabbage sowing time is too early. Because the temperature is low, it can pass through the vernalization stage at the seedling stage. As the sunshine lengthens and the temperature rises, the seedlings will enter the reproductive stage directly. The convulsions and flowers no longer form leaf balls, causing early convulsions. The early spring cabbage planting in Gu'an County had a large area of ​​convulsions and flowering in 2010, and early bolting of Chinese cabbage could not achieve the purpose of harvesting leaf balls, thereby losing the value of commodities. In this regard, farmers can take the following measures to prevent:
One must choose suitable varieties. Should use early-maturing varieties that are strong in winter and are not easy to twitch and blossom, it is generally advisable to select early-maturing varieties that are mature at 52-55 days, and choose the species that has a long growing time should be careful.
Second, we must grasp the best sowing date. Cultivation of Chinese cabbage in spring requires very strict sowing dates. Early sowing, the low temperature is not only easy to vernalization, there is early convulsions, and the seedlings are in danger of freezing injury. Late sowing and high temperature in the later period can not form compact leaf ball. The rainy season is also coming, and it is prone to soft rot, which seriously affects the yield. Therefore, spring cabbage must be strictly controlled sowing time, generally in late March sowing is appropriate.
Third, we must cultivate good seedlings. The use of protective conditions, the general use of greenhouses and greenhouse nursery seedlings or greenhouse nursery. In order to shorten the seedling period after transplanting seedlings, it is best to adopt the form of seedlings for nutrition, plastic seedlings, seedlings for seedlings, paper seedlings or nursery seedlings for nutrition. The average seedling age is 25-30 days, preferably when the daytime temperature is stable above 13°C.
Four to cover the colonization of the plastic film. When the outside temperature is stable at more than 13°C, the minimum temperature at night will still be less than 10°C. Chinese cabbage will also cause vermiose by vernalization. If covered with plastic film after the planting, the temperature can be increased by 2°C-5°C, effectively Reduce early bolting rate of Chinese cabbage. Covering the film at the same time can reduce the harm of weeds in the field and reduce the humidity in the field at the later stage of growth, which is beneficial to the formation of compact leaf spheres in Chinese cabbage.
Fifth, we must strengthen field management. Watering immediately after planting, but the amount of water should not be too large. After 2-3 days of colonization, water can be poured lightly. Watering time is appropriate at noon. After entering the lotus stage, topdressing 15 kg of nitrogen-potassium compound fertilizer per acre, and pay attention to watering, appropriate seedlings. With the constant increase in temperature, the Chinese cabbage is treated with air to prevent direct sunlight from steaming. Increased fertilizer and water management in the mid and early stages of growth of the spherules. In the later stage, the amount of watering, insufficient water, dry soil, and elevated ground temperature affect root absorption. However, excessive watering can easily lead to the spread of soft rot.
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