What are the harms of chemical fertilizers? What are the benefits of fertilizers and what are the di

Resulting in land compaction.

One of the hazards: Weakening crop productivity. Crops are just like people, and eating too much is not only bad for growth, but also bad for health.

There are two main consequences of excessive fertilization causing harm to crops: one is easy lodging, and once lodging occurs, it will inevitably lead to a reduction in grain production; The other is prone to pests and diseases, excessive application of nitrogen fertilizer, will weaken the ability of crops to resist pests and diseases, and be susceptible to pests and diseases, and then increase the amount of pesticides used to eliminate pests and diseases, which directly threatens the safety of food.

Hazard 2: Aggravate environmental pollution. When the amount of fertilizer applied excessively exceeds the soil retention capacity, it will flow into the surrounding water, causing agricultural non-point source pollution, eutrophication of water bodies, and algae growth, which in turn will damage the water environment.

According to statistics, more than 10 million tons of nitrogen are lost to farmland every year due to irrational fertilization, and the direct economic loss is about 30 billion yuan. Excess fertilizer can also seep into shallow groundwater up to 20 meters, increasing nitrate levels in groundwater.

Hazard 3: Waste a lot of scarce resources. If we can save the wasted fertilizer, it will alleviate the energy shortage in our country.

In 2004 alone, China's fertilizer production consumed about 100 million tons of standard coal, more than 5% of the country's energy consumption. In addition, China's fertilizer production consumes more than 100 million tons of high-grade phosphate rock every year, and phosphate rock has been included in the list of scarce resources after 2010 by the Ministry of Land and Resources; Fertilizer production also consumes 72% of our country's sulfur resources.

There are many chemicals in it, which are harmful to the body of many people, causing lesions in the body's vital organs.

It can increase yields, but it can lead to soil compaction.

The application of a large number of chemical fertilizers can easily make the nitrate content in vegetables exceed the standard, and nitrite is combined with amines to form n-nitrite compounds, which are strong carcinogens. It is also easy to cause a large number of deaths of beneficial bacteria and earthworms in the soil. Long-term application of chemical fertilizers can easily accelerate soil acidification and accelerate the leaching of Ca and Mg from the tillage layer, thereby reducing salt base saturation and soil fertility.

Hope it helps.

Benefits: Replenish crops with minerals such as N P needed for growth to increase yields.

Disadvantages: 1. Excessive fertilization is easy to form lodging and reduce yield. 2. Too much nitrogen fertilizer will lead to a decrease in the insect resistance of crops. 3 Environmental pollution includes eutrophication of water bodies (described in high school biology textbooks 1 and 3).

Harm to people: Contamination of groundwater.

There are two sides to everything.

The nitric acid in chemical fertilizers is reduced to nitrite by human bacteria, and nitrite is a carcinogen that can cause cancer. There are too few "green foods" in the three meals of Chinese, and chemical fertilizers have become the biggest potential killer in our food structure, and it is difficult for us to get rid of it, and long-term accumulation in the body will form toxins.

According to the law of crop fertilizer demand, soil fertilizer supply performance and fertilizer effect, the appropriate dosage and proportion of various fertilizers and the corresponding fertilization methods were proposed before production under the condition of organic fertilizer.

The promotion of formula fertilization technology can determine the amount of fertilizer, the type of fertilizer, and the period of fertilization, which is conducive to the balance of soil nutrients, reduces the waste of chemical fertilizers, and avoids pollution of the soil environment.

Harmful. Chemical fertilizers are composed of a variety of different salts, so long-term and large application of these fertilizers composed of salts, when the fertilizer enters the soil, it will increase the concentration of the soil solution and produce osmotic pressure of different sizes, crop root cells not only can not absorb water from the soil solution, but pour the water in the cytoplasm into the soil solution, which leads to crop damage. A typical example is the "burning of seedlings" in crops

After a large amount of pesticides are applied, pesticide residues or deep into groundwater will also cause pollution to water sources. In recent years, the low garlic is due to the excessive pesticide residues and the cancellation of the purchase by foreign buyers. What we eat ourselves may also fail to pass the test, but the consciousness of the domestic people is not so high, and the cost of our own testing is too high.

The general population cannot afford it.

The macronutrients nitrogen, phosphorus and potassium in the soil usually cannot meet the needs of crop growth, and chemical fertilizers containing nitrogen, phosphorus and potassium need to be applied to make up for it. In addition to chlorine, which is not lacking in the soil, several other nutrients need to be fertilized with micronutrients. Chemical fertilizers are generally inorganic compounds, and only urea [CO(NH2)2] is an organic compound.

Fertilizers that contain only one type of nutrient element that can be labeled are called unit fertilizers, such as nitrogen fertilizers, phosphate fertilizers, potassium fertilizers, etc. Any chemical fertilizer that contains two or more of the three nutrients of nitrogen, phosphorus and potassium and whose content can be indicated is called compound fertilizer or mixed fertilizer. Grade is the main indicator of fertilizer quality.

It refers to the percentage of available nutrients or their oxides in a fertilizer product. Phosphate fertilizer, nitrogen fertilizer, and potassium fertilizer are chemical fertilizers that are in high demand for plants. For details, please refer to it.