Why chemical fertilizers reduce biodiversity in farmland

From the perspective of ecology as a whole, farmland ecosystems also have their resistance stability, and human application of chemical fertilizers is an external disturbance to the farmland ecosystem, if the disturbance is long and intense, beyond the tolerance limit of the farmland ecosystem, it is difficult to restore the resistance stability to the original level, resulting in the reduction of biodiversity in the farmland.

For example, molluscs are extremely sensitive to divalent copper ions, and some plants are sensitive to selenium. However, species richness in farmland ecosystems is very low, and the extinction of any species can strain its food web.

You may ask, if you just use chemical fertilizers to make crops grow well, what do other organisms do? Won't other creatures gnaw on crops if they have more? In fact, biodiversity is a necessary condition for the growth of crops, and it is necessary to know that living things and living things, living things and inorganic environments affect each other.

If a large amount of chemical fertilizer is applied in the farmland, from a chemical point of view, the vast majority of chemical fertilizers belong to electrolytes, which will precipitate soil particles, which will destroy the aggregate structure of the soil, make the soil compact, and the soil permeability and water and fertilizer retention will decrease, so there will be a phenomenon that the more chemical fertilizer is applied, the more barren the land will be. This is the destruction of the inorganic environment by chemical fertilizers, and the inorganic environment will also react on the organisms, making the roots of crops breathe poorly, the soil flora is out of balance, and many factors that are not conducive to the growth of crops have also appeared.

This is a contemptible little insight, and I don't know if it will help you.

In short: chemical fertilizers interfere with the food chain by altering soil properties by interfering with soil microorganisms and crops. Leads to a decrease in biodiversity.

Fertilizers can break the food chain by killing organisms in a certain food chain in a field.

Fertilizers can alter soil salinity and reduce biodiversity in farmland.

All three of the above will occur. The overgrowth of algae and other aquatic plants can also cause hypoxia in the water and the mass death of fish.

The excessive use of chemical fertilizers will not only produce environmental pollution, but also reduce crop yields because of the uneven supply of soil nutrients, increase production costs, reduce economic income, and harm others and themselves!!

The development of modern agriculture should make rational use of fertilizers, which can be used to test the soil for cultivation, that is, to detect the pH value of the soil, the content of large elements (nitrogen, phosphorus, potassium, etc.) and medium elements, and then use fertilizers rationally according to the fertilizer characteristics and types of crops to be planted. Meritorious and effective!!

The consequences of excessive use of nitrogen fertilizer are serious - farmers' incomes have not increased, on the contrary, because they have bought too much nitrogen fertilizer, cost, and at the same time, the loss of nitrogen has brought more terrible pollution to the environment; Excessive fertilizer use does not increase yields, but carbon emissions.

1. Improper amount of fertilizer:One is overdose.

Fertilizer, not only causes fertilizer loss and waste, pollutes the environment, and even reduces the resistance of crops, poisoning, etc., but also hinders the absorption of other nutrients by crops.

Second, the amount of fertilizer is insufficient, resulting in insufficient nutrients and affecting the normal growth of crops.

2. Improper fertilization period:

Crop fertilization should be grasped during several key periods, such as the critical period of nutrient growth and the period of maximum efficiency of crop growth. In the transition period and vigorous growth period of crops, if the fertilizer ** is insufficient, the growth will be limited, which will cause a reduction in yield. Many farmers only pay attention to the application of basal fertilizer, and even take the way of "bombardment", which is not advisable, and should be applied on the basis of sufficient basal fertilizer, and timely topdressing in the critical period of crop growth.

3. Improper fertilization method:

One is shallow or superficial fertilization;

second, when the soil moisture is insufficient, the concentration of local fertilizer is too high;

the third is the improper selection of fertilizer varieties, such as the application of chlorine-containing fertilizers on chlorine-resistant crops;

Fourth, the fertilizer application method is improper, such as the direct use of fresh human feces and urine on vegetables without fermentation.

1) Chemical fertilizers include nitrogen fertilizers, phosphate fertilizers and potassium fertilizers, so the answer to this question is: potassium fertilizer;

2) the pH of the soil = 6, then the soil is acidic, need to add alkaline substances to improve the acidity of the soil, the commonly used substance is calcium hydroxide, this substance is commonly known as hydrated lime or slaked lime, so the answer to this question is: acidic, slaked lime (or slaked lime);

3) Ammonium chloride and calcium hydroxide are coheated to produce ammonia, calcium chloride and water silver, and the aqueous solution of ammonia is alkaline, which can make the phenol phthalein test solution red, so the answer to this question is: 2NH4

cl+ca（oh）2

cacl22nh3

2h2o, red

On the one hand, chemical fertilizers often contain some heavy metal elements, toxic organic matter and some radioactive substances, which are applied to the soil to form potential soil pollution. On the other hand, due to the accumulation, loss or change of certain components in the application process of chemical fertilizers, coarse soil acidification, increased nitrogen and phosphorus content in water areas or waters, nitride or sulfide gas backup body (N2

o、nh3h2

s, etc.), resulting in soil degradation and water and air pollution

1.Short fertilizer effect;

2.Polluting the environment, especially water sources are easily polluted, among them, some chemical fertilizers are volatile, causing air pollution, such as ammonium bicarbonate, ammonium chloride, ammonia, etc.;

3.Nitrogen fertilizers are easy to cause crops to grow, especially fast-acting fertilizers such as ammonium bicarbonate and urea; 4.

On the one hand, chemical fertilizers often contain some heavy metal elements, toxic organic substances and some radioactive substances, which form potential soil pollution after being applied to the soil; On the other hand, due to the accumulation, loss or change of certain components in the application process of chemical fertilizers, soil acidification, water or nitrogen and phosphorus content increases, nitride or sulfide gas (N2

o, NH3H2S, etc.), resulting in soil degradation and water and air pollution