Seed coating, the release agent, film formers, wetting agents, dispersants, penetrants and other additives through advanced processing technology made pesticide (insecticides, fungicides, hormones, and other kinds of fertilizer) It can be coated on the surface of the seed directly or after dilution to form a protective film of pesticide with certain strength and permeability. Seed treatment agent and seed coating agent Seed treatment agents are divided into three types: seed dressing agents, seed soaking agents, and seed coating agents. Seed dressing and seed soaking agent are a kind of field application method. Their common feature is that the farmers use solid pesticides or the aqueous solution containing pesticides to treat the seeds according to the needs of prevention and control. It is a traditional, Tiantou. One of the methods of crop protection. One of the greatest features distinguishing seed coatings from other seed treatments is their film forming properties. The seed coating agent is developed on the basis of seed dressing and seed soaking agent. The biggest advantage is that a coating film (or protective layer) having a certain function and coating strength is formed on the surface of the plant seed, and we have a drug having such a function. It is called a seed coating agent. Generally, coated seeds can be used without pesticides in the bud period and seedling period for nearly 45 days, and the dosage is only about 1/50 of the field application. Therefore, it is called the newest pesticide-saving dosage form. Obviously, compared with the first two methods of seed treatment, seed coating can meet the needs of modern large-scale agriculture, which is conducive to regional comprehensive prevention and control, and is also conducive to regional improved species promotion and unified seed supply. In practical applications, the people often cannot distinguish between seed coatings and seed dressings. They are often referred to as “seed dressingsâ€. Although they are used as seed treatments, they are used as seed coating agents. The difference between seed coating and seed dressing The composition of the seed coating agent: active substance + film forming agent + other additives (dispersant, penetrant, rheological additive, antifreeze, antifoaming agent, etc.) + filler + auxiliary ingredients (micro fertilizer, plant growth regulator, water retention) Agent, oxygen supply, etc.) + warning color. Composition of seed dressing: active substance + solvent + auxiliary material (dye, etc.). The active substance is the main formula of the seed coating agent and plays a major role in the pest control function, and includes a bactericide , an insecticide, a nematicide, a plant growth regulator, a corresponding protective agent, a trace element and the like. However, the pesticide active substances selected for the coating formulation have special requirements, such as: 1 can not affect the activity of the seed; 2 must be stable in the soil; 3 the pH of the original drug must remain basically neutral; 4 for the environment and soil Produce serious pollution; 5 moderate residual period. The development and use of international coating agents in the 1960s, the active substances selected at the beginning stage are in line with the seed dressing agents. The main drugs used are carbendazim, thiram, rust, benomyl, and nail cream. Ling et al; insecticides mainly include carbofuran, nail mix and so on. With the advent of high-efficiency and ultra-efficient pesticides, these traditional pesticides have been gradually eliminated from the seed coating formulation since the 1990s. Instead, it is replaced by triazolol, diniconazole, tebuconazole, fludioxonil, sterilized azole, imidacloprid, tefluthrin, fipronil, thiamethoxam, and the like. The film-forming material is a key component of the seed coating. It must form a film on the outer surface of the seed. It has the function of venting water permeability and certain strength, but it is not dissolved by water. It gradually degrades as the seed germinates and grows. It is a special polymer composite material. Among the above-mentioned auxiliary components, the micro-fertilizer mainly consists of zinc, boron, manganese, copper and a small amount of rare elements in a special form. Plant growth regulators are commonly used in accordance with plant needs, such as paclobutrazol, uniconazole, ketamine, rooting agent, seed germination promoter, and the like. The warning color is actually to play a certain warning role, indicating that these seeds are treated with chemicals and cannot be used for food and feed. However, our farmers have long had a misconception that the darker the coating agent, the greater the stimulating taste, and the higher the efficacy. The consequences of this concept are very serious. 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