The use of pesticides must follow: (1) According to different control objects, choose the appropriate pesticide. (2) Determine the time of application according to the occurrence of the control object. (3) Master the effective dose, and apply it at the right time. (4) According to the characteristics of pesticides, select the appropriate application method.
Commonly used methods of application are as follows:
1. Spraying method: It is the most commonly used method for controlling pests and diseases of crops in large fields. The spray pesticide is used to dilute the pesticide preparation used in liquid form, spray it onto the surface of the crop to form a drug film, and achieve the purpose of controlling pests and diseases. Spray requires a sprayer, water source and good water quality.
2. Powder spraying method: The dust is generated by the duster to spray the pesticide powder onto the surface of the crop. Suitable for water-deficient areas, high work efficiency, but the powder adhesion is poor, the flow is strong, the control effect is generally not as good as the spray method, easy to pollute the environment.
3, pouring method: is a quantitative emulsifiable concentrate. Wettable powder or water, etc., diluted with water, stirred evenly, poured into plants or sprayed with water. It is mainly used for the control of pests in rice fields. The water consumption is 2-3 times more than that of spray, which is not suitable for the prevention and treatment of most diseases.
4, application method: suitable for the application of granules and toxic soil. When making toxic soil, when the medicinal agent is a powder, it can be directly mixed with fine soil in a certain number of parts; when the liquid agent is diluted with a small amount of water, spray it on the fine soil with a sprayer and mix it with the toxic soil to control the plant. The pests should be carried out at the end of the foggy water. The prevention and control of underground pests should be carried out after the fog is dry. For highly toxic pesticides, it cannot be made into poisonous soil.
5, soil treatment method: combined with ploughing, the pesticide is applied to the ground by spraying, dusting or spreading, and then turned into the soil layer, mainly used to control underground pests, nematodes, soil-borne diseases and insects in the soil,蛹, also used for the application of systemic agents, absorbed by the roots, transmitted to the ground of the crop, to control pests and germs on the ground.
6, seed dressing method: a certain amount of pesticides mixed with the seeds and mix well after sowing, can pre-treat the pathogens and underground pests and seedling diseases attached to the seeds.
7. Seedling impregnation method: a method of impregnating seedlings with a certain concentration of chemical liquid. The commonly used pesticides are water solvents and emulsifiable concentrates for controlling pathogens attached to seedlings. Dip seedlings should strictly control the concentration, temperature and immersion time of the liquid to avoid phytotoxicity.
8. Poison bait and poisonous valley method: Mix the pesticide with stomach toxicity and the bait and grain that the pest rats like to eat, apply it to the ground, and use it to control pests on the ground. The preparation of poisonous valley should first sauté the grain or Cooked half-cooked, air-dried into a half-dried and then mixed with medicine.
9. Fumigation method: It is the use of toxic gas produced by volatile pesticides to control pests and diseases, mainly used for pest control in soil, greenhouses, greenhouses, warehouses and other places.
10, fumigation method: the main application of smoke pesticides, the ignition of pesticides to produce dense smoke dispersed in the air, play a role in the prevention and control of pests and diseases. It is mainly used to control pests and diseases in closed places such as greenhouses, greenhouses and warehouses.
11. Coating method: The systemic pesticide is formulated into a high concentration of liquid medicine, which is applied to the stems, leaves and growth points of plants, and is mainly used for controlling pests and drill collars with sucking mouthparts. For pests, fungicides with a certain penetration force can also be applied to control fruit tree diseases.
The invention and use of stainless steel can be traced back to the First World War. At that time, the British guns on the battlefield were always transported back to the rear due to wear and tear. The military production department ordered Brearley to develop high-strength wear-resistant alloy steel, specializing in solving the wear problem of the gun chamber. Brearley and his assistants collected various types of steel and alloy steels produced at home and abroad, conducted performance experiments on various types of machinery, and then selected more suitable steels to make guns. One day, they experimented with an alloy steel containing a large amount of chromium. After the wear resistance test, they found that the alloy was not wear-resistant, indicating that it could not make guns. So they recorded the experimental results and threw it in the corner. . One day a few months later, an assistant rushed to Brearley with a piece of shiny steel and said, "Sir, this is the alloy steel sent by Mr. Mullah I found when I was cleaning the warehouse. You Do you want to experiment to see what special effect it has!" "Okay!" Brearley said happily, looking at the bright and dazzling steel.
The experimental results show that it is a stainless steel that is not afraid of acid, alkali and salt. This stainless steel was invented by Mullah in Germany in 1912. However, Mullah did not know what this stainless steel was used for.
Brierley thought to himself: "This kind of non-wear-resistant but corrosion-resistant steel can't be used to make guns. Can it be used to make tableware?" He went ahead and made a stainless steel fruit knife, fork, spoon, and fruit plate and folding knives.
The stainless steel invented by Brearley was patented in the United Kingdom in 1916 and began to be mass-produced. Since then, stainless steel accidentally discovered from garbage heaps has swept the world, and Henry Brearley is also known as the "father of stainless steel".
Short Link Chain,Short Link Anchor Chain,Din766 Short Link Chain,Stainless Steel Short Link Chain
Jiangsu Hongze Stainless Steel Wire Rope Co., Ltd , https://www.hzrope.com