Herbicides are widely used in agriculture to control unwanted weeds that compete with crops for nutrients, water, and sunlight. One common method is soil treatment, where the herbicide is applied directly to the soil before or after crop emergence. Another approach is foliar application, which involves spraying the herbicide onto the leaves and stems of both weeds and crops. This technique is particularly effective when weeds are actively growing. When the herbicide is specifically applied to weeds without affecting the crop, it's referred to as spot treatment. Another innovative method is the use of herbicide films. These are specially designed plastic sheets with pre-cut holes that match the spacing of the crops. After sowing or planting, the film is laid over the field. As the crop grows through the holes, any weeds that emerge come into contact with the herbicide on the film and are effectively killed. This method reduces the need for repeated spraying and minimizes chemical exposure to the environment. Herbicides can be classified based on their mode of action, application site, and chemical composition. Systemic herbicides are absorbed by the plant and transported throughout its system, leading to complete weed death. Contact herbicides, on the other hand, only affect the parts of the plant they come into direct contact with. Selective herbicides target specific types of weeds without harming the crop, while non-selective herbicides kill all vegetation they touch. From a chemical perspective, herbicides can be organic or inorganic compounds. Organic herbicides, such as glyphosate, are commonly used due to their effectiveness and relatively low toxicity. Inorganic herbicides, like certain salt-based formulations, are also used in specific applications. With global efforts to reduce environmental impact, modern herbicides are being developed to be more efficient, less toxic, and environmentally friendly. Many new formulations are designed for single-use, low-dose applications that minimize pollution. It's important to follow proper usage guidelines to ensure safety and effectiveness. Always refer to local agricultural authorities or trusted sources like China Pesticide Network for accurate and up-to-date information.
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