After the onion is planted, in addition to the application of the base fertilizer, a certain topdressing management is required. Onion needs a lot of fertilizer during the growing season, so we must pay attention to the problem of onion topdressing. How to top dress onions? What are the topdressing methods for onions? After the onion was planted, the root system was first grown. After that, it turned to the growth of the shoots. After the local upper part was fully grown, it entered the period of bulb growth. According to the growth and development characteristics of onion, it is one of the keys to high yield of onion. 1, slow seedling fertilizer After 15 to 20 days after planting, the seedling fertilizer is slowed down, and nutrients are added for the continued growth of the root system while preparing for the growth of the shoots that will soon begin. After applying 5~6 kg of urea per acre, watering is used to facilitate absorption and utilization. 2, the fertilizer 30 days after planting, the growth of onion vegetative growth should be followed by the application of fertilizer to ensure the growth of above-ground functional leaves. Because the growth of leaf vegetative bodies directly affects the size of the bulbs in the future; good leaf growth is the basis for the development of onion bulbs. Onion fertilization is mainly based on nitrogen fertilizer, applying 5-6 kg of urea per acre and applying 5 kg of potassium sulfate. 3, the head fertilizer After the plants have 8~10 tubular leaves, the bulbs begin to expand. The primary fertilizer should be applied once. The key period of the fertilizer is the mid-bulk growth period. In the early stage of bulb expansion, the nitrogen fertilizer should not be applied too much. Excessive nitrogen fertilizer can cause the leaves to “grave†and affect harvesting. It is recommended to apply 5~7 kg of urea per mu and 8 kg of potassium sulfate. In the growing season of onion bulbs, potassium deficiency will not only reduce the yield, but also have a certain impact on the storability of the product. The above is the skill of onion topdressing shared by Xiaobian. Onion topdressing is divided into slow seedling fertilizer, hairy fertilizer and primed fertilizer. Onion top dressing should pay attention to the amount of fertilizer and the time of fertilization. Vitamins are a type of trace organic substances that humans and animals must obtain from food in order to maintain normal physiological functions. In terms of physiological functions, vitamins are neither a raw material for tissues nor a substance for supplying energy, but they are an indispensable substance for the body. It has many types and different chemical structures. Most of them are the components of the coenzyme (or prosthetic group) of certain enzymes. They are the indispensable compounds for maintaining the normal growth (growth, health, reproduction and production function) of the body. It plays a catalytic role in the body to promote the synthesis and degradation of major nutrients (proteins, fats, carbohydrates, etc.), thereby controlling metabolism. Vitamins are essentially low-molecular organic compounds. They cannot be synthesized in the body, or the amount synthesized is difficult to meet the needs of the body, so they must be supplied from the outside. The daily requirement of vitamins is very small (usually measured in milligrams or micrograms). They are neither a raw material for body tissues nor a substance for energy supply in the body. However, they do not regulate material metabolism, promote growth and development, and maintain physiological functions. Vitamin K2 MK-7, Vitamin C, Vitamin E, Vitamin K2, Vitamin H, Vitamin D3 Xi'an Gawen Biotechnology Co., Ltd , https://www.ahualynbios.com
