1. Increase the ground temperature
Before garlic enters the greening period, the ground temperature should be increased. The covering on the membrane, such as leaves, crop stalks, dead garlic leaves or dust, etc., should be removed as soon as possible to increase the light transmittance and raise the ground temperature. The damaged mulch should be repaired in time to enhance the effect of heat preservation and warming, and promote the early rejuvenation of mulching garlic.
2. Fertilizer and water management
After entering the "Jingzhe" solar term, choose watering and topdressing in the morning on sunny days for 3 to 5 consecutive days, combined with watering acres and fertilizing 20 kg plus 15 kg nitrogen and potassium fertilizer. In case of special drought, you can water once in late March. In principle, do not water too early, otherwise it will easily cause disease or secondary garlic growth. After each watering, it should be cultivated in time to raise the ground temperature to protect the roots and seedlings. If the leaves have yellow tips before and after the Ching Ming Festival, a second topdressing should be carried out in time, mainly using quick-acting nitrogen fertilizer, the usage amount per mu is 20 kg, and the watering frequency should be increased in a timely manner, generally watering once every 10-15 days. Promote plant growth.
3. Prevent and control diseases
The temperature in spring is low, and it is prone to cold weather, which affects the normal growth of garlic. At the end of March, when garlic enters the greening period, choose to spray "Bihu" or brassin on the leaves in the afternoon on a sunny day to improve its resistance to stress. Leaf blight and gray mold are common diseases of garlic in spring. At the initial stage of the disease, small white dots appear on the tip of garlic leaves or light brown oblong disease spots appear on the surface of the leaves. When the disease is severe, the leaves die, the base rots, and the garlic plants fall down. When the diseased plant rate reaches 15%, use 50% carbendazim 800 times liquid or 20% Fenmeining 2000 times liquid spray for control.
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Vitamins are a kind of trace organic substances that humans and animals must obtain from food in order to maintain normal physiological functions. They play an important role in the growth, metabolism, and development of the human body. In the body, this kind of substance can neither be a raw material for body tissue nor a source of energy, but a kind of regulating substance, which plays an important role in material metabolism.
From the point of view of chemical structure, various vitamins are very different or even unrelated. Therefore, vitamins are usually classified according to their physical properties. They can be divided into fat-soluble vitamins (such as vitamin A, D, E, K, etc.) and water-soluble vitamins ( Such as vitamin C, vitamin B1, B2, B6, B12, pantothenic acid, PP, biotin, folic acid, choline, etc.). Water-soluble vitamins are easily soluble in water but not soluble in organic solvents. They are stored in the body after absorption. Excessive amounts are mostly eliminated in the urine; fat-soluble vitamins are easily soluble in organic solvents but not in water. They can be absorbed by the body with fat and stored in the body, and the excretion rate is not high.
From the perspective of obtaining methods, vitamins can be divided into natural products and chemical synthetic products. Because natural vitamins are limited by raw materials and extraction technology, their yields are low, and their prices are high. Therefore, chemical synthesis takes the lead, accounting for about 80% of the total vitamin output. Among the various segments of the vitamin industry, vitamin B, vitamin E, vitamin C and vitamin A have the largest market shares, 33%, 30%, 21% and 13% respectively. Other vitamins have a smaller market share, accounting for only 3%.
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