Many farmers' friends are stubborn and believe that quick results are good fertilizers. In fact, this is a very serious misuse of fertilizer. In fact, quick results may not be good fertilizers. In general, the fertilizer efficiency of fertilizer products is as follows (for reference only):
Ammonium bicarbonate: effective on the day, the fertilizer effect period is 15 days;
Ammonium chloride: three days effective, fertilizer effect period of 25 days, later de-fertilization;
Urea: 7 days effective, fat effect period 45 days;
Compound fertilizer: 10 days effective, fertilizer effect period 90 days;
Hormonal substances: quick effect, but not much nutrition, no practical help for increasing production;
Bio-fertilizer: Generally, it takes effect in about one month, and the effect is not obvious on crops with long growth cycle, but the fertilizer effect can last for 6-8 months;
Fertilizer products give us immediate results and are favored by farmers. Long-term fertilization not only improves soil fertility, but is also an important measure to increase crop yield per unit area. But the impact of the abuse of fertilizer is far-reaching. The main hazards are as follows:
1. Increase in heavy metals and toxic substances in the land;
2. The microbial activity is reduced and the substance is difficult to convert.
Experiments conducted by the Nanjing Institute of Soil Science of the Chinese Academy of Sciences show that the application of different fertilizers has a great impact on the activity of microorganisms. The order of soil microbial quantity and activity is: organic fertilizer combined with inorganic fertilizer > single application of organic fertilizer > single application of inorganic fertilizer.
3, nutrient imbalance, nitrate accumulation
The fertilizer applied in China is mainly nitrogen fertilizer, while phosphate fertilizer, potassium fertilizer and compound fertilizer are less. Long-term application causes soil nutrient imbalance, which aggravates the depletion of soil phosphorus and potassium, leading to the accumulation of nitrate nitrogen. If it is not fully assimilated by the crop, its content will increase rapidly. After ingesting the human body, the oxygen carrying capacity of the blood will decrease, and methemoglobinemia will be induced. In severe cases, people may suffocate and die. At the same time, it can also be converted into a strong carcinogenic nitrosamine in the body, which induces various cancers of the digestive system and endangers human health.
4, acidification is intensified, ph value changes too fast, will reduce salt saturation rate and soil fertility.
5. Impact on crops
Fertilizers are composed of various kinds of salts. Therefore, long-term and large-scale application of these fertilizers consisting of salt will increase the concentration of soil solution and produce different osmotic pressures when the fertilizer enters the soil. The root cells of the crop are not only It is impossible to absorb water from the soil solution, but instead pours the water in the cytoplasm into the soil solution, which causes the crop to be damaged. A typical example is the crop "burning seedlings"
6. Impact on the environment
After a large amount of pesticides are applied, pesticide residues or deep groundwater are caused, which also pollutes the water source. For example, in recent years, the price of garlic is low because pesticide residues exceed the standard.
To reduce hazards and drawbacks, the following aspects can be used:
1. Strengthen environmental awareness and strengthen monitoring and management
2. Add organic fertilizer to improve physical and chemical properties
3. Popularize formula fertilization to promote nutrient balance
4. Apply nitrification inhibitors to alleviate soil pollution
5. Take a multi-pronged approach to improve fertilization methods
Organic fertilizer is a carbonaceous material that is applied to the soil to provide plant nutrition as its primary function. Compared with fertilizer, it has great advantages.
Bio-organic fertilizers are complete in nutrient elements; there are only one or several nutrient elements in fertilizers.
Bio-organic fertilizers can improve soils; frequent use of fertilizers can cause soil compaction.
Bio-organic fertilizer can improve product quality; excessive application of chemical fertilizer leads to poor product quality.
Bio-organic fertilizer can improve the rhizosphere microflora of crops and improve the ability of plants to resist pests and diseases; chemical fertilizers are single crop micro-organisms, which are prone to pests and diseases.
Bio-organic fertilizer can promote the utilization of chemical fertilizers and improve the utilization rate of chemical fertilizers. The use of chemical fertilizers alone can easily cause the fixation and loss of nutrients.
The quick effect is not necessarily a good fertilizer. The real good fertilizer is a fertilizer that is beneficial to our land environment and crops.
This article URL: Is the fertilizer that is effective? Is it a good fertilizer? Fertilizer effect duration of different fertilizer types
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