Autumn lettuce is planted in the hot season in summer and early autumn. The temperature is high and seed germination is difficult. Special management should be conducted to cultivate strong seedlings. The optimum temperature for seed germination is 15°C to 18°C, the maximum temperature is 28°C, and light is needed. Therefore, low-temperature germination is required before sowing of summer and autumn lettuce. Methods include:
1. Hanging well method: seeds are soaked in the newly proposed well water (15°C or so) or cold water for 5-6 hours, rinsed 2 or 3 times, remove the mucus impurities, remove it, dry it slightly, pack it with a wet cloth bag, and hang it. At a distance of 10 to 30 cm from the well surface, the temperature is maintained at about 15°C. It is washed 1 to 2 times a day with well water and sprouts for 3 to 4 days.
2. Refrigeration method: soak the seeds for 24 hours, wash them clean, wrap them with gauze, and place them in the refrigerator or freezer, refrigerate them at a temperature of 3°C to 5°C for 24 hours, and then place them in a cool, well-ventilated place where the seeds germinate slowly. get on. When the buds are white, spread out in a cool, airy place with scattered light, and pay attention to spray, moisturize, and prevent dryness. After 2 or 3 days, when the germ appears pale green, it can be sown. After germination and sprouting, they are neat and emergent and have strong resistance to stress.
3. Sand mixing method: soak the seed for 1 to 2 hours and mix it with wet sand, place it on the air-raid shelter or water tank, keep it cool and moist, and germinate in 3 to 4 days.
4. Irrigation Covering Method: After the seedbed has been broiled and dried, the seedlings are flattened and finely ground. The dried seeds are sown and covered with a thick layer of straw. Then, straw or bricks are used to hold down the straw. The seedbeds are soaked every evening in the evening, and seeds germinate gradually in 2 to 3 days.
5. Growth regulator germination method: In the high temperature of 30 °C ~ 40 °C, can also be used 5 mg / liter of gibberellic acid soaked for about 8 hours, and then rinse with tap water, you can sow, the germination rate can be increased to 80% . After sowing, we must use a shade shed (cloudy sky) or shade nets. We can also plant seeds under the guashes or mix them with the unearthed cabbage.
Bulk of varicella vaccine,semi-Finished Products.It has good safety with low ratio in adverse reaction. And it has been exported to Bangladesh.
In 2008, BCHT successfully launched its product Varicella Vaccine, Live in China. In the following years, BCHT continuously committed to improving the product and led in 2010 removal of gelatin from adjuvant and extended the vaccine shelf-life up to 36 months which is the longest one in the world in 2011. And it has the following qualities.
Biotechnology Bioproducts Preventive,Final Bulk Medicine Preventive,Final Bulk Pharmaceutical Preventive,Vaccine Biological Products Preventive
Changchun BCHT Biotechnology Co. , https://www.ccbcht.com