Basal fertilizer should account for more than half of the total Under fertilization, cotton is in a state of starvation and it is difficult to achieve high yields. However, excessive fertilization will not only waste investment, but also inhibit the growth and development of cotton, resulting in reduced production. Agro-technical extension workers reminded that cotton field fertilization should master the principles of "Fertilizers for roots, speed of Miaofei, stability of buds, fertilizers for flowers and bells, and fertilizer for Pushi". In the fertilizer needed for cotton production, the basic (bottom) fertilizer accounts for 40% to 50% of the total amount of fertilizer, and top dressing fertilizer accounts for 50% to 60% of the total amount of fertilizer. More than 50% of the base (bottom) fertilizer in the cotton field will cause an early growth of the cotton seedlings, a serious fall of the bolls, and a premature senescence in the later period; two will be harmed by pests and diseases. How much is the appropriate amount of cotton basal? Usually can be considered from two aspects, one is the proportion of formula fertilization, the second is the fertilizer input costs. From the aspect of balanced balanced fertilization, the ratio of nitrogen, phosphorus and potassium is preferably 1:0.3:1. According to this ratio, all kinds of fertilizers can be reasonably applied to avoid antagonism and affect the exertion of fertilizer efficiency. Hybrid insect-resistant cotton is very sensitive to potash fertilizer, and must not be used in the proportion of fertilizers. In terms of fertilizer input, the medium-fertilizer cotton fields produce about 350 kg per mu of seed cotton, 300-350 yuan per mu of fertilizer, and 150 yuan of basic (bottom) fertilizer. Organic and inorganic fertilizers are recommended to be used in conjunction with the application, which will not only improve the soil but also ensure the balanced transport of various types of fertilizers and increase the fertilizer supply capacity of cotton fields. Base (bottom) fertilizer, bio-organic compound fertilizer can be used per mu 30-40 kg, nitrogen, phosphorus, potassium content of ternary compound fertilizer 15-20 kg, potassium fertilizer 10-15 kg, no biological organic fertilizer, can Increase the amount of ternary compound fertilizer, but still have to add potassium fertilizer. 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.ahualynbio.com