Why does cadmium pollution occur in rice cultivation?

Most of the cadmium pollution in rice is due to excessive cadmium levels in the soil, and the soil has already been contaminated with cadmium.

The pollution of cadmium to the soil is mainly in two forms, one is that the cadmium in the industrial waste gas spreads with the wind and accumulates in the soil around the factory through natural sedimentation, and the other is the cadmium-containing industrial wastewater to irrigate the farmland, so that the soil is polluted by cadmium.

Cadmium pollution in rice should be remediated in the soil or sprayed with cadmium-reducing foliar inhibitors when planting rice to reduce the transfer of heavy metals in the edible parts of crops and reduce the content of heavy metals in rice.

Foshan Tieren Environmental Protection Technology Co., Ltd. is a national high-tech enterprise, a national intellectual property advantage enterprise, committed to the cause of human health, focusing on soil (farmland, sites, mines) heavy metal pollution control, and providing system solutions, the whole process of chain environmental consulting and engineering implementation services, the company has participated in the remediation of farmland heavy metal pollution area of 1.8 million mu (of which, the comprehensive contracting repair of heavy metal polluted farmland area of about 80,000 acres) in Hunan, Guangdong, Guangxi and other places have carried out nearly 90 site soil investigation and remediation projects, and have accumulated rich experience in project development.

Foliar inhibitor spraying can be tried.

1. Cadmium foliar inhibitor can effectively reduce the heavy metal content of crops.

After years of field experiments, the application of foliar inhibitors in mildly polluted farmland can reduce the absorption of heavy metal cadmium by 30%-40% on average.

2. Foliar inhibitors can effectively use nutrients.

Foliar inhibitors can regulate nitrogen, phosphorus and potassium in crops.

The balance of the absorption of Dong's punch is improved, the utilization rate of fertilizers is improved, and nutrients are used more effectively.

3. Foliar inhibitors can effectively improve crop yields.

Foliar inhibitors can promote photosynthesis of bulk matter.

and organic matter accumulation, increasing crop yields.

4. Foliar inhibitors are sprayed on the foliar surface, which avoids secondary damage to the soil, improves the utilization rate of the product and reduces the cost.

Hope it helps

Flooded irrigation. Water shortage in paddy fields, especially premature dehydration in the later stage, can easily increase the risk of cadmium accumulation in rice. For the safe use of cadmium celery with moderate and light pollution, the "flooding method" should be vigorously promoted, requiring the rice to maintain an aqueous layer in the field throughout the growth period until it dries naturally about 7 days before harvest, so as to prevent premature dehydration in the later stage.

The large cover, especially from 20 days before heading to 20 days after heading, must ensure that there is a 3 cm water layer between the fingers of the field to prevent the alternation of dry and wet soil.

<> there is generally no good way to solve the problem of excessive cadmium in rice, but it is usually possible to reduce the probability of this situation by doing some control measures. Because the discharge of industrial wastewater and the application of fertilizers with high cadmium content are usually one of the reasons for the excessive cadmium in rice, it is necessary to control the discharge of industrial wastewater in the prevention and control, and reasonably use phosphorus fertilizers with low cadmium content, in addition to this, it is also necessary to improve the acidity of the soil, avoid soil acidification, reduce the probability of cadmium exceedance, and generally use alkaline substances such as lime to improve reasonably. Can't find an answer.

1. How to solve the excessive cadmium in rice

1. How to solve it.

At present, there is usually no way to solve the problem of excessive cadmium in rice, but the probability of this situation can be reduced by doing a good job of prevention and control.

2. How to prevent and control.

1) It is necessary to control the discharge of industrial wastewater, if you need to use fertilizer, you can generally use phosphorus fertilizer with low cadmium content, and you also need to use livestock and poultry manure reasonably to reduce the probability of cadmium exceeding the standard in rice.

2) For acidified soil, alkaline substances such as lime can usually be reasonably applied to improve soil acidity and reduce the probability of cadmium exceedance.

2. What is the cause of excessive cadmium in rice?

1. The reason for the occurrence.

1) The soil has become acidic.

2) Factors such as the discharge of wastewater and waste gas produced by mining and smelting, and the application of cadmium-containing phosphate fertilizers are generally easy to cause cadmium pollution in cultivated land, and then it is easy to lead to cadmium exceeding the standard.

3) It should be noted that even if there is a long distance from the smelter, when the exhaust gas is diffused, it may fall into the farmland with rainfall and cause harm.

2. Introduction to cadmium.

1) Cadmium is a toxic heavy metal, which can accumulate in the human body and the environment for a long time, and cause pollution to the environment and damage human health.

2) When humans inhale the smoke of cadmium oxide, they are prone to acute poisoning, and if they inhale cadmium for a long time, chronic poisoning can also occur, which makes humans sick.

3) Rice is one of the crops that are prone to accumulation of cadmium, and the roots will first absorb cadmium in the field, and then transport it upwards to the stems, leaves and rice, causing excessive cadmium in rice.

4) In order to prevent cadmium from polluting the environment, it is usually necessary to do a good job in environmental protection and strictly implement the environmental health standards for cadmium.

5) It is usually necessary to wear a personal gas mask when carrying out the welding and electroplating process, and there is also an exhaust equipment to prevent cadmium poisoning.

<>In addition to the soil itself containing cadmium, the application of cadmium-containing phosphate fertilizers, the discharge of wastewater and waste gas from mining and smelting are usually prone to excessive cadmium standards. Cadmium is a toxic heavy metal substance, which can accumulate in the human body and the environment for a long time, and its way into the human body is mainly for humans to eat food with cadmium, such as rice, when the root system of rice absorbs cadmium in the rice field, it will be transported to the stems, leaves and rice, and it will be processed into rice and let humans eat it for a long time, it is easy to affect human health.

1. What is the cause of excessive cadmium in rice?

1. The reason for the occurrence.

1) Cadmium is inherent in the soil.

2) The application of cadmium-containing phosphate fertilizer, the discharge of wastewater and waste gas produced by mining and smelting and other factors will easily cause cadmium pollution in cultivated land, and then it is easy to exceed the cadmium standard.

2. Hazards. (1) Because rice is a crop used to produce rice, when rice with excessive cadmium is processed into rice, if humans eat it for a long time, it is prone to health problems.

2) Rice is one of the crops that are easy to accumulate cadmium, and when the cadmium in the rice field is absorbed through the root system of rice, it will be transported upwards to the stems, leaves and rice, so that the cadmium in rice exceeds the standard.

3) Cadmium is a toxic heavy metal substance that can accumulate in the human body and the environment for a long time, and entering the human body through food is the most important way.

2. How to prevent and control excessive cadmium in rice

1. Prevention and control methods.

1) Strengthen the control of the source, such as controlling the discharge of industrial wastewater, using phosphorus fertilizers with low cadmium content, and rationally using livestock and poultry manure, so as to reduce the probability of cadmium rice.

2) When the soil is acidified, it is easy to cause excessive cadmium in rice, so the reasonable treatment of soil acidification generally has a certain control effect, and the alkaline substances such as lime can generally be reasonably used to improve soil acidity.

2. How to prevent and treat cadmium poisoning.

1) Cadmium and its compounds are usually toxic, and poisoning may occur after inhalation of cadmium oxide smoke.

2) In order to prevent cadmium poisoning, it is necessary to have good ventilation and airtight devices for smelting and using cadmium and its compounds, and when carrying out welding and electroplating processes, in addition to the necessary exhaust equipment, it is also necessary to wear personal gas masks when operating.

The low water temperature in the field of the plots with water rust is not conducive to the growth and development of rice roots. Rust appears in the field like rust, some melt into the water, and some still float on the water. Wherever there is rusty water, we can feel that the temperature of the rusty water is much lower than that of the same plot of land when we touch the rusty water with our feet and hands.

In the early stage of rice growth, the ground temperature rises slowly, if it encounters low temperature and rain for a long time, the rice growth of the plot with rusty water is poor, and the rice grows slowly from the initial green and late tillering to the last stiff seedlings and shrinking seedlings of rice.

Therefore<> it is a non-fungal disease of rice physiological stiffness seedlings caused by water rust, and it is a physiological disease caused by poor growth environment.

Water rust seriously affects the tillering of rice plants.

Rice seedlings can reach 8 12 effective panicles under normal tillering without the influence of water rust. However, in the rusty plot, it is already very good for rice seedlings to successfully tiller 5 or 6 effective panicles.

We know that the yield per mu of rice depends on how many effective panicles there are in an acre of land and how much seed setting rate there are on the effective panicles. There are not many effective ears, and the yield per mu of rice is directly reduced.

This problem is common for rural people, there is rust in the field, but whether the rice is good or not should have little to do with rust. There is rust in the fields, and most of them have yellow mud on the walls.

and self-sufficiency of water, plus there are ducks in the field grazing, there is rust. Generally, when planting rice, there is rust in the field, farmers go down to the field to plant seedlings, barefoot, rust will stick to the top, it will be infected, the light one will itch, and the heavy one will have sores and pus.

Let me first talk about the composition of the rust, the main components of the rust are calcium carbonate, magnesium hydroxide and other substances, which are weakly alkaline mineral salts, which are ingested into the body during drinking water and eating, and will react with gastric juice (the main component is hydrochloric acid, strong acidity) and decompose into an ionic state, that is, calcium and magnesium ions, which can be absorbed by the human body. Even if you eat substances that cannot be absorbed by the human body, they will be excreted with the digestive system (gastrointestinal tract), rust in the water is not the cause of stones, the real "stones" are oxalate, urate, which are produced in the urinary system, and the production of kidney stones is still related to factors such as less water drinking and poor eating habits.

Pollution of paddy fields will affect the growth of rice plants, and may also cause the leaves to be extinguished and yellowed, shrunken, curly tails and tails, etc., and in serious cases, it may also lead to no panicle, no grain setting or plant death.

If the paddy fields of rice are polluted, then it will seriously affect the yield of rice because the pollution will increase the toxic effect on rice.