What are the main pollutants from the production of nitrogen fertilizers 10

Chemical fertilizer pollution is mainly caused by unreasonable use methods and the use of substandard chemical fertilizers, fertilizer pollution in the process of grape production, must be strictly in accordance with the agricultural industry standards NY T394-2000 "Green Food Fertilizer Use Guidelines" and NY T4962002 "General Principles for the Rational Use of Fertilizers", in accordance with the law of grape growth and development, in different phenological periods, balanced fertilization or formula fertilization.

In principle, it is necessary to maintain or increase soil fertility and the activity of soil microorganisms by mainly decomposing organic fertilizers (manure, green manure, peat fertilizer and cake fertilizer, etc.), supplemented by chemical fertilizers. If the use of commercial fertilizers, such as humic acid, microbial fertilizer, compound fertilizer, etc., there must be "three certificates", that is, there is a registration certificate of the agricultural administrative department, a production license and a manual for the use of the main components of the fertilizer, as well as the production address, batch number, date, etc.

The pesticides advocated are mainly divided into: plant-derived pesticides, such as pyrethroids, fish, tobacco, etc., bio-derived pesticides, such as agricultural antibiotics for the prevention and control of real diseases, such as spring leimycin, blasticide, polyoxymycin (polyantimycin), agricultural resistance 120, paramycin, mesomycin, pesticides for the prevention and control of mites are liuyangmycin, huaguangmycin and so on.

Pollution of waste water and exhaust gases. The main pollutants in the wastewater of the large nitrogen fertilizer plant are organic matter such as ammonia, urea, methyl and metal ions (copper, sodium, zinc, calcium, aluminum, hunger, chromium), etc. They mainly come from the condensate of the ammonia low-variable process, the condensate of the decarburization process, and the desorption waste of urea.

The main pollutants in the exhaust gas are ammonia and urea dust. Ammonia mainly comes from the synthetic nitrogen freezing system and the decomposition of urea.

Nitrogen fertilizer (n fertilizer) is a type of chemical fertilizer. Commonly used chemical fertilizers (fertilizers) are usually applied to the three major elements of nitrogen (N), phosphorus (P) and potassium (K) that are lacking in the soil. Poor crop growth is usually associated with deficiencies in one or both of these three categories, and the specific deficiencies vary from province to province and region, as well as with previous cultivation and fertilization practices.

Targeted supplementation is necessary, but not too much, otherwise it will endanger the soil quality, and there will be serious problems such as salinization.

Nitrogen fertilizer pollution: According to a European survey, nitrogen pollution in the European atmosphere reduces life expectancy in Europe by 6 months. China's atmospheric nitrogen levels are more than five times higher than those in Europe.

Atmospheric nitrogen comes mainly from overuse in agriculture. This is the main killer of human lifespan.

Nitrogen fertilizer is mainly urea, generally coal gasification, purification, synthetic ammonia, urea, the main pollution is air pollution, water pollution, waste heat, ash pollution.

"Nitrate nitrogen" is used in agriculture to supplement the element "nitrogen", so that the growth of crops is accelerated, and the growth period and harvest period of crops are prolonged. Crops lack "nitrogen" fruit development is stunted, deformed fruits are more, correspondingly speaking, potassium nitrate and other fertilizers play a vital role in the growth of crops, belonging to the three major elements necessary for crop growth.

The macronutrients nitrogen, phosphorus and potassium in the soil usually cannot meet the needs of crop growth, and chemical fertilizers containing nitrogen, phosphorus and potassium need to be applied to make up for it. In addition to chlorine, which is not lacking in the soil, several other nutrients need to be fertilized with micronutrients. Chemical fertilizers are generally mostly inorganic compounds, and only urea is an organic compound.

Fertilizers that contain only one type of nutrient element that can be labeled are called unit fertilizers, such as nitrogen fertilizers, phosphate fertilizers, potassium fertilizers, etc. Any chemical fertilizer that contains two or more of the three nutrients of nitrogen, phosphorus and potassium and whose content can be indicated is called compound fertilizer or mixed fertilizer.

Basic information: "Nitrate nitrogen" is used in agriculture to supplement the element "nitrogen", so that crop growth is accelerated, and the crop growth period and harvest period are extended.

Crops lack "nitrogen" fruit development is stunted, deformed fruits are more, correspondingly speaking, potassium nitrate and other fertilizers play a vital role in the growth of crops, belonging to the three major elements necessary for crop growth.

Nitrate nitrogen can supplement the "nitrogen" element in chemical fertilizers, which can accelerate the growth of crops and prolong the growth period and harvest period of crops.

If crops lack "nitrogen", the fruit will be stunted and there are many deformed fruits, so "nitrogen" plays a vital role in the growth of crops, and it is also one of the three major elements necessary for crop growth.

Nitrate nitrogen refers to the element nitrogen contained in nitrate. Organic matter in water and soil decomposes to form ammonium salts, which are oxidized to nitrate nitrogen. Nitrate nitrogen is the mainstay, plus nitrite (salt) nitrogen, ammonia nitrogen and organic nitrogen, which are collectively called total nitrogen or total (state) nitrogen, and substances containing "nitrate nitrogen" include "potassium nitrate, ammonium nitrate, sodium calcium nitrate, calcium nitrate" and other nitric acid chemical raw materials.

"Nitrate nitrogen" is easily soluble in water, and the water temperature is lowered after dissolving water; "Nitrate nitrogen" is flammable, explosive, and easy to absorb moisture. Nitrate nitrogen is found in many water-soluble fertilizers.

Nitrate nitrogen refers to nitric acid bai

The element du nitrogen contained in salt. The organic matter in water and soil decomposes to form ammonium salts, which are oxidized and turned into nitrate nitrogen. Nitrate nitrogen is the main genus, plus nitrite (salt) nitrogen, ammonia nitrogen and organic nitrogen are collectively called total nitrogen or total (state) nitrogen.

Substances containing "nitrate nitrogen" include "potassium nitrate, ammonium nitrate, sodium calcium nitrate, calcium nitrate" and other nitric acid chemical raw materials.

"Nitrate nitrogen" is easily soluble in water, and the water temperature is lowered after dissolving water; "Nitrate nitrogen" is flammable, explosive, and easy to absorb moisture. Nitrate nitrogen is found in many water-soluble fertilizers.

1. Nitrogen fertilizers containing nitrate belong to the category of nitrate nitrogen fertilizers, such as sodium nitrate, potassium nitrate, calcium nitrate and ammonium nitrate.

2. Soluble in water, nitrate nitrogen fertilizer is easily soluble in water, and produces nitrate ions and corresponding cations, which is a fast-acting nitrogen fertilizer deficit.

3. It cannot be adsorbed by the soil, because nitrate is a negatively charged eggplant, and cannot be adsorbed by negatively charged soil colloids, so nitrate nitrogen fertilizer can only exist in the soil solution after being applied to the soil, and move with the movement of soil moisture.

4. Easy denitrification loss, under the condition of soil flooding or disgust with the sedan car, nitrate ions due to denitrification will form nitrogen oxide gas or nitrogen gas that cannot be used by various crops and denitrification loss.

5. Nitrate nitrogen fertilizer is generally used for dry farming top dressing, and the yield increase effect is very good.

1. Nitrogen fertilizers containing nitrate belong to the category of nitrate nitrogen fertilizers, such as sodium nitrate, potassium nitrate, calcium nitrate and ammonium nitrate.

2. Soluble in water, nitrate nitrogen fertilizer is easily soluble in water, and produces nitrate ions and corresponding cations, which is a fast-acting nitrogen fertilizer.

3. It cannot be adsorbed in the soil, because nitrate is a negatively charged anion and cannot be adsorbed by negatively charged soil particles, so nitrate nitrogen fertilizer can only exist in the soil solution after being applied to the soil, and move with the movement of soil water.

4. Easy denitrification loss, under the condition of soil flooding or dislike, nitrate ions are denitrified due to denitrification, and nitrogen oxide gas or nitrogen gas that cannot be used by various crops is lost.

5. Nitrate nitrogen fertilizer is generally used for dry farming top dressing, and the yield increase effect is very good.

Nitrogen fertilizer is actually a kind of fertilizer, which is the main fertilizer that can promote the growth of flower roots, stems and leaves, and the nitrogen contained in it plays a very important role in the growth of crops. The application of nitrogen fertilizer can not only increase the yield of agricultural products, but also improve the quality of agricultural products. Do you know what organic nitrogen fertilizers are?

What are the common nitrogen fertilizers? Let's take a look!

Organic nitrogen fertilizers have urea. Without free ammonium ions, NH2 and C in urea are bound together and need to be converted into N in the plant through the absorption of the plant. Moreover, urea is a typical organic matter, so it is called organic nitrogen fertilizer, and organic nitrogen fertilizer is mainly urea.

Nitrogen-containing fertilizers are nitrogen fertilizers, urea nitrogen content in nitrogen fertilizers, nitrogen fertilizers are soluble in water, are in the form of white powder, ammonium nitrogen fertilizer can be tested with hydrated lime, and ammonia is released. Urea is a synthetic organic substance, which is widely found in nature, such as urea in fresh human feces. Urea contains 46% nitrogen (N), which is the nitrogen content in solid nitrogen fertilizer.

Urea is hydrolyzed into ammonium carbonate or ammonium bicarbonate by urease in the soil before it can be absorbed and utilized by crops, so it should be applied 4 to 8 days before the fertilizer requirement period of crops. Urea is a physiological neutral fertilizer, which does not leave any harmful substances in the soil, and has no adverse effects when applied for a long time.

What are the common nitrogen fertilizers?

Ammonium nitrogen fertilizer: including ammonium bicarbonate (NH4HCO3), ammonium sulfate, ammonium chloride (NH4Cl), ammonia (liquid ammonia (NH3), etc.

Nitrate nitrogen fertilizer: including sodium nitrate (nano3), calcium nitrate, ammonium nitrate (NH4NO3), etc.

Amide nitrogen fertilizer: urea.

1.Nitrogen line judgment can not do fertilizer flushing;

2.71% of the atmosphere is nitrogen, but nitrate and ammonium nitrogen fertilizers still need to be applied;

3.The biological nitrogen fixation of some plants is not a fertilization process, but a redox process in which 0-valent nitrogen is oxidized to positive 5-valent, and nitrogen baffles reflect reduction in this process. Embarrassment

The main reasons for such low nitrogen use efficiency are: nitrate nitrogen fertilizer is not adsorbed and preserved by soil in the soil, and is easily leached by rainwater or irrigation water; or denitrification in the soil and volatilization of gaseous nitrogen; Ammonium nitrogen fertilizers can be adsorbed by the soil, but they are applied to calcareous or alkaline soils, easy to decompose ammonia and volatilize, such unstable fertilizers as ammonium carbonate, easy to volatilize and lose, in addition, ammonium nitrogen in the soil due to the action of bacteria nitrification into nitrate nitrogen. This is an important reason for the low use efficiency of ammonium nitrogen fertilizer. Urea nitrogen is mainly the old way of repeating ammonium nitrogen fertilizer after it becomes ammonium nitrogen; The second is that it is lost in case of rain or irrigation after application, so the application of nitrogen fertilizer must take the correct fertilization method according to the specific situation.

How can we improve nitrogen use efficiency? In general, nitrogen use efficiency can be moderately improved. There are two ways to start.

First, in terms of agronomy, (1) deep soil covering; (2) formula fertilization; (3) The combination of water and fertilizer and other measures to improve fertilizer utilization rate. Second, in terms of process, it can be adopted: (1) ammonium carbonate modification to produce long-lasting ammonium carbonate; (2) Adopt coating technology to produce coated urea; (3) The production of controlled-release urea can greatly improve the nitrogen fertilizer utilization efficiency, which can be increased by about 10 30 percentage points.

Appropriate measures can be taken to appropriately improve nitrogen fertilizer use efficiency. 2.Measures to improve nitrogen use efficiency include both agronomic and technological aspects.

For farmers, deep soil application, formula fertilization and combination of water and fertilizer are effective ways to improve nitrogen fertilizer use efficiency.