Method for treat Chinese cabbage seeds
1. Drying: In order to improve the germination potential of seeds, the seeds can be dried for 2-3 days, 2-3 hours a day, and then placed in the shade to dissipate heat. This method can improve the vitality of seeds after long-term preservation.
2, warm soup soaking: In order to prevent the seeds from carrying bacteria, warm soup soaking can be carried out. The specific method is to soak the seeds in cold water 10 minute, then soak them in warm water at 50~54℃ for 30 minutes, immediately move them into cold water for cooling, and then take them out and dry them in a ventilated place to sow.
3. Chemical seed dressing
(1) In order to control downy mildew, black rot and other seed-borne diseases, 0.3% ~ 0.4% of the seed amount can be used for seed dressing, such as Toxofenadine, thiram or mancozeb.
② To control soft rot, 65438 ~ 1 seed weight of 0.5% or 70%DTM wettable powder of 0.2% seed weight can be used for seed dressing.
Seeding method of Chinese cabbage seeds
It is important to sow Chinese cabbage in time. Choosing a suitable sowing date to meet the needs of environmental conditions in different periods of Chinese cabbage is the key to a bumper harvest of Chinese cabbage. Sowing methods are divided into direct seeding and seedling raising.
1. Direct seeding: Direct seeding is the main cultivation method. The direct seeding is to ditch the whole ridge or border with a depth of about 1.5 cm, artificially sow along the ditch, and then cover the soil to suppress it, and the seed dosage per mu is 150 ~ 200 g.
2. Seedling raising: The plots with high terrain, fertile land and good drainage should be selected for seedling raising. The sowing date in autumn is 3-5 days earlier than the direct seeding, and the seedling stage is 20-25 days. The temperature is low in winter and spring, and the growth of seedlings is slow, which takes 40 ~ 50 days. Late spring is hot in summer, the temperature is high, and the seedlings grow rapidly, which takes 25 ~ 30 days. When raising seedlings, appropriate protective facilities should be taken according to the local seasonal climate characteristics. Winter sowing and early-maturing cultivation, due to the cold winter, should adopt efficient and energy-saving solar greenhouse sowing and seedling raising. Spring sowing and early maturity cultivation, due to the low temperature in early spring, is suitable for sowing and seedling raising in ordinary sunlight greenhouse. Planting in late spring and early summer, due to the low temperature in late spring and morning and evening, should be planted in plastic arch shed and planted in the open field. Early maturity cultivation in summer, due to the hot and rainy climate in summer, we should use shade shed to cool down and sow, or cover grass after direct seeding, water to cool down and protect seedlings, and pay attention to drainage after rain.
3. Temperature control: Chinese cabbage usually blooms after 2℃ ~ 13℃ vernalization 10 ~ 25 days, so the minimum temperature of seedbed in spring should be above 15℃, and the low temperature below 10℃ should be avoided as far as possible after planting. Attention should be paid to shading and watering during the high temperature period in summer. When sowing, water should be poured on the soles of the feet to keep the bed soil moist, so as to facilitate seedling emergence. When planting seedlings separately, water them in time, especially during the high temperature period in summer. After planting, water should be poured 1 ~ 2 times continuously, and then 1 after 5 ~ 7 days. It is not suitable for flooding, and attention should be paid to drainage and waterlogging prevention in rainy season to prevent soft rot.