Winter frost damage and frost defense of vegetables

Winter freeze injury of vegetables occurs mainly in North China and the middle and lower reaches of the Yangtze River. In North China, roots are mainly rooted in spinach and celery, and leeks and scallions do not freeze in winter. It usually occurs in the cold, arid winter, and warm winters do not generally occur. In severe cases, there are many dead seedlings and even no production. The degree of frost damage depends on the cold resistance and external conditions of the plant. The strength of cold resistance depends on the resistance of the varieties. In general, the sharp-leaved spinach has stronger cold resistance than the round-leaved spinach, and the dead seedling rate is low. Leaf-tip spinach in North China can tolerate low temperatures below -10°C, and Harbin's barbed varieties can even withstand low temperatures of -30°C. Cold resistance is also related to the age of seedlings and seedlings. For example, round leaves of spinach with 6 to 8 leaves, strong seedlings about 10 cm high cold resistance, the Beijing area in late September to early October sowing is appropriate. The cold resistance is also related to the nutrient status of the plant. Generally applying phosphate fertilizer helps to increase the cold resistance, and excessive nitrogen fertilizer can reduce the cold resistance. Leveling the land and increasing organic fertilizers also have a great effect on reducing freezing damage. At the same time, it is necessary to prevent and control locusts in time, prevent and treat sow worms to infect the virus so as to reduce the resistance of plants and die seedlings. In addition, the use of wind barriers, film coverage and other antifreeze effects are also very good. The defense frost of vegetable frost damage occurs during the active growing season of crops, and the damage occurs at temperatures below 0°C or below 0°C, but not so low. Spring frost is the most harmful to the seedlings after planting. Autumn frost, also known as early frost, focuses on the frost damage that initially appeared in autumn, and harms unheated vegetables that are not yet harvested. Heat-resistant vegetables are the least resistant to freezing and can be frozen to death at 0°C. Thermophilic vegetables do not necessarily die under light frost, and all suffer from heavy frost. Cold-tolerant vegetables are only victimized by intense frost, but they are generally not dead. The defense against frost is mainly to do a good frost forecast, and determine the appropriate transplanting period according to the production experience. After the cold air was selected, transplanting began to pick up, so that the seedlings gradually adapt to the environment and improve the survival rate. In the late stage of nursery, pay attention to ventilation and cooling exercise seedlings. Age-appropriate seedlings are stronger than the tall, thin, weak seedlings. Cover straw, straw, and mulch before frost. Watered the day before the frost came. Stable temperature prevents frost. Before the frost occurs, water is sprayed on the surface of the plant, and there is also a frost-proof effect, or smoke is produced to form a smoke screen to prevent frost damage. The smoke should not be premature, and the smoke should be even and uniform, and the distribution of the smoke should be even.

Goji Berry ( [Goji" means [happy") , also called wolfberry, has been used for thousands of years by herbalists in China to protect the liver, help eyesight, boost immune function, improve circulation, and promote longevity and overall well being. It has only recently gained popularity in the west, it has become so polar, in fact, the Time Magazine recently named the Goji berry as [super-fruit" of the year. A big reason why Goji berries have quickly become a favorite nutritional supplement is that its impressive list of ingredients. The Goji berry, also called the wolfberry, is a bright purplish red or purple red berry that comes from a shrub that is native to China. In Asia, goji berries have been eaten for generation in the hope of living longer.    

 

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