Pesticides pollute the environment, so why do you have to spray pesticides when farming?

Because it is easy to have insects without spraying pesticides, and there will be a lot of grass that affects the growth of crops, the most important thing is that pesticides can increase crop yields, so there are many pesticides sprayed now.

One of the biggest uses of pesticides is to remove pests and diseases. Pests and diseases are very harmful to crops. So sometimes you have to spray pesticides.

In agricultural production, the role of pesticides can not be overestimated, but even more can not underestimate or even slander pesticides, after all, in agricultural production, if farmers do not use pesticides, the labor cost will be higher, but the yield and income of crops can not go up.

It can be said that in agricultural production, pesticides play a "escort" role, it is difficult to imagine that if there are no pesticides now, agricultural production will regress to what extent?

Because 1, I can't plant land without pesticides 2. The cost of planting land without pesticides and fertilizers is high, are you willing to pay that money? Without the use of pesticides and fertilizers, farmers would need to invest more labor (such as catching insects) in farming

The effects of pesticide spraying on crops mainly include residual hazards, chronic hazards, and acute hazards. Crops are our daily food**, how should we reduce the impact of pesticides on them? Let me answer you in detail.

First, the specific meaning of pesticides causing various harms to crops.

First of all, the specific meaning of residual hazard is that when we spray pesticides on crops, some pesticides will be directly left on crops and then harm crops. Then the specific meaning of chronic hazards is that the impact of pesticides on crops is not immediately reflected, this hazard is not easy to observe, and it is easy to be confused with the physiological diseases of the crops themselves. Finally, the specific meaning of acute hazard is that the harm of pesticides to crops can be immediately reflected, and the main symptoms are spots, perforations and burning.

Second, how to reduce the adverse effects of pesticides on crops.

The main ways to reduce the impact of pesticides on crops are as follows. First of all, we must use pesticides rationally in accordance with the requirements of the state, and we cannot use pesticides at will based on our own subjective feelings. Then we have to alternate the use of drugs to control pests and diseases, and develop resistance to pesticides.

When pests and diseases become resistant, many people will directly increase the amount of pesticides, but this is not only useless, but also has a very bad impact on crops and the environment. Finally, we should also pay attention to the right medicine, according to the pests and diseases to choose pesticides, many people in life will be because of the good effect of a pesticide has been using that kind of pesticide, without considering the transfer of pesticides, this is actually a very bad behavior.

Third, how should we reduce the harm of pesticides to ourselves in our daily life.

Crops are the food we eat every day**, and how should we ensure our own food security when it has been seriously infested with pesticides.

This. First of all, we must wash vegetables and fruits when we eat them, and then we can try to choose to buy ecological vegetables that are not sprayed with pesticides.

I hope that through my ability, I can help you better understand how to reduce the impact of pesticides on crops.

Acute drug injury. After spraying for hours or days, the crop will show noticeable symptoms. For example, crop leaves are white, yellow, and have different problems such as spots, perforations, curls, cokes, sagging, wilting, and falling off.

In general, this drug damage is a phenomenon caused by improper use of drugs in humans. Chronic drug damage: After spraying chronic drug damage, the current drug damage is not obvious.

After a period of crop growth, it is found that the crop growth and development is poor, slow, short or weak. For example, if we spray drugs to inhibit the growth of crops, if the dose is too large, it will cause drug damage, and the growth of the plants will be stagnant and jointed, and they will only grow thicker, and the leaves will not be elongated and thicker.

This kind of drug damage mostly occurs in the problem of reasonable changes in drug efficacy caused by excessive pesticide dosage or unreasonable proportion, and in the United States, drug harm is related to crops. For example, some crops are sensitive to certain copper sulfate drugs, and some crops are sensitive to calcium arsenate and cannot be absorbed; 2.Drug damage is related to the spraying environment.

This is related to problems such as temperature and humidity, such as low temperature, high dew, spraying pesticides, crops can not be effectively absorbed, and drug residues on crop plants for too long will cause drug damage. 3.Man-made drug injury.

For example, go to an informal place, buy fake pesticides, or mix pesticides to control pests and diseases, or complete a pesticide to control crop pests and diseases. It craves to use the drug again every once in a while.

Spraying pesticides can sometimes produce acute damage, chronic damage and pesticide residue damage, which can lead to wilting, stunted growth, and weakened photosynthesis, resulting in reduced crop yields.

If pesticides are sprayed too much, the residual pesticides will accumulate in the food chain, and the species at the top of the food chain will be most harmful (generally to people). Long-term spraying of pesticides can disrupt the ecological balance.

Spraying pesticides can reduce the occurrence of pests and diseases in crops, but to a certain extent, spraying pesticides will also cause other diseases in crops, so that the quality of crops will decline, and the yield will decrease; In order to reduce this effect, it is necessary to choose the right pesticide for spraying, and when spraying, it should be in a certain proportion, and the crops should be watered on time after spraying.

Spraying pesticides will produce pesticide residues on crops, in order to reduce this impact, you can not use drugs indiscriminately, you should use drugs reasonably and correctly, and you should choose suitable drugs according to the diseases and pests of crops.

It will have a great impact on crops, it will affect the development of crops, it will affect the yield of crops, and it will also affect the growth. In normal times, attention should be paid to the amount of pesticides sprayed and the proportion of pesticides.

It is understood that excessive application of chemical fertilizers and pesticides will lead to malignant changes in soil properties, reduced product quality, and large differences in air pollution and production-to-income ratio. Taking the malignant change of soil properties as an example, many single chemical fertilizers are used to produce a variety of organic chemical salts due to a part of the soil compounds, which in turn leads to the imbalance of soil nutrient structure, the decline of physical properties, and the malignant transformation of soil properties.

(1) If a lot of single-element fertilizers are used in the field, their nutrients can not be digested and absorbed by crops, and nitrogen. Phosphorus. Some compounds, such as potassium, are susceptible to soil and produce a variety of organic chemical salts.

2) If the organic chemical salt content in the soil is too high, it will lead to the imbalance of soil nutrient structure, the decline of physical properties, and the toxic metal materials and harmful pathogenic bacteria in some lands exceed the standard, which will cause the malignant transformation of soil properties.

1) When planting crops, if a certain type of chemical fertilizer is applied, it will cause an imbalance in the nutrient composition of crops, and the conversion and generation of some chemicals in the body will be blocked, which will lead to a decrease in product quality.

(2) Too much chemical fertilizer will cause fruits and vegetables to be unsweet. Vegetables and fruits are not fragrant.

1) Too much chemical fertilizer will cause soil water-soluble nutrients and other substances to be washed by precipitation and field water injection into surface water and rivers, resulting in surface water and river water pollution in some places.

2) A part of the river. Fish and shrimp in the lake will continue to die.

1) Too much use of a single chemical fertilizer will lead to an imbalance in the nutrient composition of crops, an imbalance in nutrients, only increase the cost but not the production volume, resulting in low-quality agricultural products that are not easy to sell in the market or slightly lower in price, etc., and then provide damage to farmers.

2) suffer from the level of cultivation and planting. The limitation of factors such as the amount of fertilizer applied to crops prevents crops from obtaining high yields, which endangers the income of farmers.

Because there are a lot of pesticides. Large-scale use and its indiscriminate use, coupled with the non-biodegradability of pesticides, have led to obvious environmental pollution to the earth.

(1) The common sprayer method is used to apply pesticides, and the organic solution in the pesticide and a part of the pesticide will float in the air, and the air will be polluted immediately.

2) When the fields that have been sprayed with pesticides are washed by precipitation, the pesticides will enter the rivers and pollute the deep sea.

3) Some pesticide residues have a long time period, and this part of the pesticide will enter the deepest part of the geological structure according to the diffusion of the soil, and then pollute the surface water.

1) Many pesticides are used to destroy the nemesis of many insect pests, destroy the biological diversity of nature, and cause more serious diseases, such as planthoppers. leafhoppers and a variety of vine blight pests and diseases.

2) Pesticides not only lead to rapid pest breeding, but also harm birds that depend on insects for their livelihoods. Fish. Frogs and other microorganisms cause death and injury.

In agricultural production, chemical fertilizers and pesticides are very necessary, because phone bills can provide energy for plant growth. Pesticides prevent pests and diseases. This is essential.

Because many people think that they can increase the yield when they use it, and they also think that it can increase the growth rate, so they will use it.

Because this can control pests and diseases, can increase yields, and is good for agricultural products.

No matter how pesticides can kill insects, long-term exposure will have a great impact on both our human body and the environment. If you want to develop agriculture, then you can't do without pesticides, pesticides can kill insects, weeds and rigen, and its types have many functions and are more similar. Although we can't do without pesticides, but ifWe all know that pesticides are toxic and harmful substances, and we standardize the use of pesticides in production, which will not only not reduce the fertility of the soil, but also will not have a great impact on the acidity of the key forest, and can effectively help crops grow.

Some pesticides can prevent crops and plants from being eaten and damaged by pests, while some pesticides can control weeds and prevent some weeds from harming crops, and pesticides can help us improve crop yields. But in any case, although pesticides can kill insects, but it is also a harmful substance, it is also a mixture of a variety of materialsThese pesticide residues may enter the air, soil, and even the water and food we eat, which will inevitably bring a certain degree of harm to our human body, but it is also unrealistic if I ask us to give up the idea of using pesticides to control pests.

NowadaysChemical control remains one of the most effective and economical means, according to todayScientific developmentWhen we encounter sudden invasions and biological disasters, there is no way to replace chemical pesticides. Therefore, in order to reduce the use of pesticides, we must vigorously promote the integrated management technology of crop diseases and insect pests, reduce the toxicity of pesticides, low toxicity and slightly toxic pesticides are greater than 75%, and now the high toxic pesticides that cause a large number of poisoning in the society have long been eliminatedNowadays, the safety of pesticides has become higher and higher, so in the face of such a situation, although pesticides will bring harm to our human body, we do not need to worry too much about the pesticide residues in the food we eat.

Generally, the roots of pesticide crops are the most, followed by the neck, leaves and fruits, so when we use pesticides, we must strictly follow the operation requirements.

( ) China has always been a big agricultural country, so relatively speaking, in order to maintain food production, the use of pesticides is more, so the harm caused by pesticide pollution is relatively serious, so what are the specific harms of pesticide pollution?

The pesticides that cause pollution are mainly organochlorine pesticides, metal preparations containing lead, arsenic, mercury and other substances, and some specific herbicides.

The loss of pesticides into the environment will cause serious environmental pollution and sometimes even extremely dangerous consequences.

Polluting the air and water environment, resulting in soil compaction.

The pesticides lost to the environment are evaporated and transpired into the atmosphere, and the fluttering pesticides are adsorbed by the dust in the air. and spread with the wind. Cause pollution of the atmospheric environment.

Pesticides in the atmosphere, through rainfall, these pesticides flow into the water, thus causing pollution of the water environment, causing harm to people, animals, especially aquatic organisms (such as fish and shrimp). At the same time, pesticides lost to the soil can also cause soil compaction.

Enhance the resistance of germs and pests to pesticides.

Using the same pesticide for a long time will eventually enhance the resistance of germs and pests. In the future, the prevention and control of the same kind of bacteria and pests must continue to increase the dosage of pesticides, otherwise the purpose of eliminating bacteria and pests cannot be achieved. A vicious circle is formed.

Kills beneficial organisms.

The vast majority of pesticides kill a variety of organisms without selectivity, including organisms that are beneficial to people, such as frogs, bees, birds, and earthworms. The reduction or extinction of these beneficial insects and birds actually reduces the natural enemies of pests, which will lead to an increase in the number of pests and affect agricultural production.

Poisoning of wildlife and livestock.

Eating food contaminated with pesticides can cause acute or chronic poisoning by wildlife, livestock and poultry. The most important thing is that pesticides affect the reproductive ability of organisms, such as many birds and poultry due to the influence of pesticides, the weight of the eggs is reduced and the eggshells are thinned and easily broken. The extinction of many wildlife species is directly related to pesticide pollution.

In addition, chronic poisoning caused by the accumulation of a small amount of pesticides in the human body cannot be ignored. Pesticide contamination has caused many public hazards. Many have banned the use of pesticides such as ddt, dieldrin, chlorine preparations, etc., and actively develop and produce low-toxicity and high-efficiency pesticides, while paying attention to the scientific use of pesticides, vigorously advocating biological control, protecting beneficial birds and insects, and achieving "treating insects with birds" and "treating insects with insects".