What are the main manifestations of chemical fertilizers on soil pollution?
The use of fertilizers has had a serious impact on farmland: first, excessive fertilization has caused salinization of the land; Due to long-term heavy fertilization, it leads to the accumulation of salt in the soil, especially nitrate nitrogen. In this process, a large amount of salt matter accumulates on the surface due to the repolymerization of large quantities of salt matter, which leads to the salinization of the soil. Salinization has seriously affected the ecological environment of farmland, caused the deterioration of the ecological environment of farmland, and caused problems such as deterioration of farmland ecological environment and soil erosion.
Secondly, the heavy metals contained in fertilizers can also cause land pollution. Some fertilizers contain heavy metals, such as lead, arsenic, cadmium, etc., which will lead to the accumulation of heavy metals in the soil if used in large quantities for a long time. Heavy metals are an important class of environmental pollutants that pose a threat to human health through the food chain, for example.
In addition, nutrients such as nitrogen and phosphorus contained in fertilizers also have a great impact on the soil. A large amount of N and P inputs led to excessive N and P content in soil, resulting in soil acidification and water eutrophication. The existence of these problems will have a significant impact on the surrounding environment.
On the whole, there is a large amount of heavy metal pollution in China's agricultural production, such as salinization, heavy metal pollution, nutrient element pollution, etc. It is of great significance to maintain China's land and ecological environment by promoting the sustainable development of China's agriculture through scientific fertilization, vigorously developing organic and inorganic fertilizers, and strengthening the monitoring and management of soil.