Ten dangers of excessive use of chemical fertilizer!

We have relied on the grain of chemical fertilizer crops for decades, which has provided a great help for us to increase grain production. But decades of single use of chemical fertilizer has been completely excessive! It has even caused irreparable losses!

10 major hazards of excessive use of chemical fertilizer:

1. Chemical fertilizer does not contain organic matter and humus, so a large number of chemical fertilizers are used. Due to the lack of organic matter and humus, the soil aggregate structure is destroyed, resulting in soil consolidation and the decrease of agricultural plant yield.

two。 The utilization rate of chemical fertilizer is low, because nitrogen fertilizer is volatile and lost, the utilization rate of nitrogen fertilizer is only 30% 50%, and the utilization rate of phosphate fertilizer is only 10% 25%. Because phosphate is chemically active, most of the phosphorus is combined with cations such as Zn2+, Mg2+, Ca2+, Fe3+, Al3+ and other cations in the soil to form insoluble phosphate fertilizer. The utilization rate of potassium is only about 50%.

3. The use of a large amount of chemical fertilizer greatly reduces the quality of vegetables, melons and fruits. Because crops need not only nitrogen, phosphorus and potassium, but also many trace elements such as calcium, iron, zinc and selenium, and the general composition of chemical fertilizer is relatively single, long-term use of chemical fertilizer will inevitably lead to a single nutrient in the soil, which can easily lead to crop nutrition maladjustment, which will hinder the internal transformation and synthesis of crops, which will inevitably lead to the decline of crop quality, melons are not sweet and vegetables are not fragrant.

4. It is harmful to human health. When a large amount of chemical fertilizer is applied, the content of nitrate in vegetables is easy to exceed the standard, and nitrite combines with amines to form N-nitrite compounds which are strong carcinogens.

5. The extensive use of chemical fertilizer also caused the death of a large number of beneficial bacteria and earthworms in the soil.

6. The long-term inefficient application of chemical fertilizer often leads to excessive accumulation of some elements in soil, changes of soil physical and chemical properties and environmental pollution.

7. Judging from the heavy use of chemical fertilizers in China, the more chemical fertilizers are used, the lower the location will be, and the more dependent they will be on chemical fertilizers, thus forming a vicious circle.

8, bring serious loss of income to farmers. According to a sample survey, 80% of farmers in China are accustomed to fertilizing according to traditional experience, without considering the characteristics of various fertilizers, and blindly adopt simple fertilization methods such as "flushing fertilizer with water" and "shelling". All over the country, there are 1x3 farmers fertilizing crops excessively, which leads to the continuous increase of farmers' investment in farming. Although the grain yield has increased, the phenomenon of increasing production without increasing income is becoming more and more serious. In some places, due to the long-term excessive use of chemical fertilizers, only increase costs but not increase output, resulting in poor quality of agricultural products, slow increase or even reduce farmers' income.

9, affect the quality of crops. Due to the large amount of single element fertilizer applied in farmland, its nutrients can not be effectively absorbed and utilized by crops. Some chemicals such as nitrogen, phosphorus and potassium are easily consolidated by the soil, resulting in the accumulation of various salts in the soil, resulting in the imbalance of soil nutrients, the content of harmful heavy metals and the amount of harmful bacteria in some plots exceed the standard, resulting in the deterioration of soil properties. the transformation and synthesis of some substances in crops is blocked, which reduces the quality of agricultural products. Excessive use of chemical fertilizer makes the growth character of fruits and vegetables poor, and easy to rot, not suitable for storage.

10, leading to threats to the security of food and agricultural products. Excessive use of chemical fertilizer is extremely easy to lodge crops, but once lodging occurs, it will inevitably lead to a reduction in grain production and threaten China's food security; excessive use of chemical fertilizer is also prone to diseases and insect pests. The use of excessive nitrogen fertilizer will weaken the ability of crops to resist diseases and insect pests and be vulnerable to the infection of diseases and insect pests, and then increase the amount of pesticides against insect pests, which will directly threaten the safety of food. Once eating contaminated agricultural products, it will pose a serious threat to human health, leading to poisoning and other diseases.