The seed coating agent is prepared by a specific process flow by a pesticide ( insecticide , fungicide, etc.), a fertilizer, a growth regulator, a film forming agent and a supporting auxiliary agent, and can be directly or diluted to cover the surface of the seed to form A product of a protective film having a certain strength and permeability. Seed coating agents are increasingly favored by consumers because they have the functions of killing underground pests, preventing seed bacteria, improving seed germination rate, and improving crop quality. As of September 2016, there have been 528 seed coating products registered in the country, and more and more domestic companies have begun to turn their attention to the seed coating market. Seed coating agents are developing at an unprecedented rate.
1 Why use a seed coating
1.1 High security
The seed coating agent is processed by advanced technology. After the seed coating, a protective film is formed on the surface of the seed. Under the influence of the protective film, the seed coating agent concentrates, is not easy to spread to the periphery, and is less affected by the environment. The soil is pollution-free and less harmful to natural enemies. The seed coating agent only coats the seeds, and the pesticide residues on the plants and agricultural products are greatly reduced, so that the obtained agricultural products are also safer. In addition, the warning color of the seed coating agent also eliminates the phenomenon of grain and seed, and is safer for humans and animals.
1.2 has high efficiency
After the seed coating agent is solidified into a film on the surface of the seed, it can only swell in the soil without being dissolved, so that the medicament and the micro-fertilizer are slowly released, prolonging the efficacy period and increasing the control effect. As a composite product, the seed coating agent can effectively improve the quality of the seed, increase the resistance of the plant, and play the role of emergence, fullness and strength. The use of seed coatings can also effectively reduce the use of pesticides, fertilizers and improved varieties, and truly achieve the effect of one application, multiple effects, and reduce production costs.
1.3 Easy to mechanize
After using the seed coating agent, the surface of the seed is smoother, and the seed coating agent can adjust the size of the seed particles, make the seed size uniform, more suitable for mechanized operation, greatly improve the mechanical seeding rate, and is more conducive to seed standardization, industrialization and commercialization. In line with China's "two high and one excellent" agricultural requirements.
2 How to choose the right coating agent
2.1 Product quality is the key
At present, there are many kinds of seed coating agents, the quality of products is uneven, the market is not standardized, and there are formulas, even ingredients and content can be more or less, often causing huge losses to farmers. The choice of seed coating agent should go to the formal department to select the products of regular manufacturers, choose large-scale, full-line product, reputable production enterprises, and avoid small enterprises that have not heard of. When purchasing, be sure to carefully identify the product label, carefully check the pesticide registration number, pesticide production approval certificate number, and product standard number of the product, and avoid the inferior products with incomplete “three certificatesâ€. See if the film is good or bad, the good film-forming agent has fast film formation, uniform film quality, no shedding, water and gas permeability, and the inferior seed coating agent has no film-forming agent or poor film-forming property (it will fall off with a hand). Stuffing, rotten seeds, burning seeds, phytotoxicity, affecting emergence.
2.2 Purposeful choice
At present, the registration scope of seed coating agents mainly includes corn, wheat, rice, cotton, peanuts, soybeans, sorghum, etc., depending on the dosage form, it can be divided into suspension seed coating agent and seed treatment suspension agent. The former needs to specify the coating rate. And the shedding rate, the latter is used in seed dressing. There are many types of seed coating agents, and they are highly targeted. If they are not purchased and used as required, they may cause phytotoxicity. Therefore, in the selection, we must fully understand the scope of use of the seed coating agent, according to their actual needs to choose the right product, should not be blindly selected.
3 Precautions for use
3.1 Strict dosage
The seed coating agent is only used for seed coating, and it is strictly forbidden to spray with water. Shake the agent thoroughly before use. It should be used strictly according to the product instructions. The dosage should be accurate. The dosage of the coating agent should not be changed arbitrarily. If excessive use often inhibits the growth and development of plants, the roots of the buds are swollen, deformed, distorted, and even occur. Phytotoxicity, such as reduced use, the control effect is poor, it is difficult to achieve the intended purpose.
3.2 Over-reliance on prevention and control
The use of seed coatings can effectively reduce the occurrence of pests and diseases, greatly increase the yield of crops, but the seed coating agent does not mean once and for all. The fungicide in the seed coating agent is mainly for the systemic infection of seed-borne bacteria, such as sorghum, corn smut, etc., but has a good effect on non-systemic invasive diseases such as corn. Spot disease and small spot disease are ineffective. Insecticides in seed coatings have limited control effects on underground pests, especially in the years when underground pests occur, and it is difficult to achieve effective prevention and control by relying solely on seed coating agents. On the basis of rational use of seed coating agents, it is necessary to pay close attention to the development of pests and diseases, and take other measures to control the occurrence of pests and diseases when necessary.
3.3 Prevention of seed coating remedies
Timely sowing, early sowing or late sowing may cause phytotoxicity and bring losses to production. Reasonable topdressing, habitual early application, and excessive application of nitrogen fertilizer cause excessive nitrogen in the crops, which is not resistant to drugs, easy to fall, and aggravate phytotoxicity. In case of large areas lacking seedlings and ridges, timely replanting or replanting other crops, try to minimize losses.
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