What is the role and efficacy of urea on crops?

Urea. It is an indispensable fertilizer in the planting process, but in the process of use, many farmers have some misunderstandings, such as partial application of nitrogen fertilizer, resulting in vigorous plant growth, increasing fertilizer amount, and causing a great burden on the soil.

According to statistics, the utilization rate of urea used by farmers is only 30% 35%, that is, after applying a large amount of chemical fertilizer, crops absorb very little and waste a lot. Therefore, many farmers now have a question, now the amount of urea is increasing, but the yield has not increased significantly, what is the reason for the low utilization rate of urea?

On the one hand, because of the improper fertilization method, the volatilization of ammonia after urea conversion, the fertilizer utilization rate is low, on the other hand, the partial application of urea and the amount of urea is too large, which has exceeded the normal nitrogen demand, and the fertilizer utilization rate will become low, taking wheat topdressing as an example.

After the wheat returns to green, it is time to start to chase back the green manure and water back to the green water, this time the watering and fertilization are mainly to promote tillering.

Increase yields. On the problem of top dressing, most farmers still use urea, and the amount is more and more, from the previous only 30 catties per mu, to now an acre of land has increased to 70 catties or even 80 catties, although the amount of fertilizer has increased, but what has changed the yield?

We came to a wheat planting area, and the local farmers had an exchange, the highest amount of local wheat top dressing is 80 catties per acre, some farmers only use 30 or 40 catties per acre, but from the fertilizer alone, there seems to be no obvious difference in wheat yield, the average per mu is about 1,200 catties.

Therefore, it can be seen from this point that it is not that the more urea is used, the higher the yield. If the wheat base fertilizer has been used a large amount of compound fertilizer.

Then only 30 catties of urea need to be used in top dressing, mainly to promote wheat tillering and jointing.

Thirty catties per mu is enough, why use eighty catties? It is not only a waste of manpower and money, but more importantly, it exceeds the normal demand for wheat, and the fertilizer utilization rate will also be reduced, which is also harmful to the soil environment. Many farmers who plant small areas do not have to worry about the cost, but for large land owners, it also takes a lot of money to calculate the whole.

The state has also been advocating the strategy of increasing efficiency, which is not only good for the growth of crops, but also does not have much burden on the entire soil. The application of urea has a certain effect on the growth of crops, but the application of urea is only a method to improve the yield, and cannot completely rely on fertilizers.

If you want to improve the utilization rate of urea, the key lies in the amount of fertilizer applied and the method of fertilization.

1.can increase the protein content in the seeds, 2It can make the leaves of crops better photosynthesize.

Urea contains a lot of nitrogen, which can protect the growth of crops well and make crops grow faster.

Urea can be a good way to add nutrients to plants and crops. so as not to have yellow leaves and other conditions.

In the past, this kind of thing was used in farming at home and planting many crops, which provided nutrients to crops and brought some beneficial elements to the growth of crops.

What is the role and effect of urea fertilizer? Please see below for your introduction. Urea fertilizer is a white granular substance.

It can increase the nitrogen content of plants. Promotes the production of new leaves and shoots, especially in early spring. Secondly, urea fertilizer can make the branches and leaves of plants green.

Reduces the likelihood of yellowing. Thirdly, urea fertilizer can inhibit the differentiation of flower buds. To a certain extent, the effect of thinning flowers.

Fourth, urea fertilizer can also play a role in thinning fruits. A large number of fruits on the branches can be thinned by applying urea fertilizer, making the fruits huge.

Urea. It is an organic nitrogen fertilizer that is hydrolyzed into ammonium carbonate by urease in the soilAmmonium bicarbonateAfter that, it can be absorbed and utilized by crops. Therefore, urea should be applied 4 to 8 days before the fertilization period of the crop.

Urea is suitable for base fertilizer and top dressing, and sometimes also used as seed fertilizer. Urea is molecular before conversion, can not be adsorbed by the soil, should be prevented from losing with water, the ammonia formed after conversion is also volatile, so urea should also be deeply applied to cover the soil.

The correct way to use urea fertilizer

Use in combination with other fertilizers. Thirty percent of urea is mixed with phosphorus and potassium fertilizer, then applied to the soil, and finally the remaining urea is applied. Time for top dressing. When using urea as top dressing, it should be used one week in advance.

Urea is sprayed on the foliar surface. Spraying urea on the foliar surface can prolong the life of functional leaves. Urea with a lower biuret content is used. Urea can be sprayed at 4 p.m.

The addition of urea to automobiles mainly plays a role in purifying the exhaust gas in the car.

Urea, the scientific name for automobiles, is a diesel engine exhaust treatment fluid, which is used in diesel engines. It reacts with nitrogen oxides in exhaust gases to reduce NOx emissions and optimize engine performance and fuel consumption.

1. The role of adding urea: adding urea is for diesel engines, because diesel engines will emit nitrogen oxides, which are harmful to the atmosphere and the human body. Long-term absorption of these gases by humans can cause respiratory diseases.

To reduce the harm of this gas to the atmosphere and humans, urea will be used, which involves catalytic reactions. When urea encounters nitrogen oxides emitted by diesel engines, it will produce a chemical reaction to convert nitrogen oxides into nitrogen and water, which is harmless to the atmosphere and the human body.

2. The scientific name of automotive urea is diesel exhaust treatment fluid: it is a necessary consumable in SCR technology. The SCR system includes a urea tank and an SCR catalytic reaction tank.

The working process of the SCR system is as follows: when nitrogen oxides are found in the exhaust pipe, the urea tank automatically sprays out the diesel exhaust gas treatment liquid, and the diesel exhaust gas treatment fluid and nitrogen oxides undergo redox reaction in the SCR catalytic reaction box to generate pollution-free nitrogen and water vapor discharge.

3. Consequences: If the diesel exhaust treatment fluid is not loaded, or the purity is not enough, or the quality is poor, the vehicle engine will automatically slow down. At the same time, the inferior diesel exhaust gas treatment fluid will contaminate the catalyst in the SCR catalytic reaction tank, causing serious consequences.

The main function of car plus urea is to reduce nitrogen oxides in automobile exhaust, so that automobile emission pollution can be reduced, thereby improving the environmental protection of vehicles

Cars with diesel engines should add urea, because diesel engines will emit harmful gases and nitrogen oxides, causing environmental pollution. Long-term inhalation of this exhaust gas by humans will cause great harm to the human body. To reduce this hazard, urea, which has a catalytic effect, should be added to cars with diesel engines.

When nitrogen oxides are encountered, a chemical reaction occurs, and the nitrogen oxides are turned into nitrogen and water, which are then discharged.

Qualified urea solution is NOx synthesized with ultra-pure urea and pure water. AdBlue solutions can be converted to nitrogen, oxygen and water through selective catalytic reduction reaction with NOx products, thereby reducing NOx emissions. Suitable for all Euro 4 and Euro 5 emission diesel SCR systems.

The car does not add the effect of urea

1. It will cause certain pollution to the environment, mainly because the emission exceeds the standard.

2. The urea nozzle will be blocked, which is mainly due to the oxidation of the chemicals in the automobile system, so that the urea pump will be damaged by dry burning, and the pipeline will crystallize, which will lead to the scrapping of the whole system.

3. The power of the car decreases.

4. During the annual inspection, the car does not add urea, which is very difficult to pass the trial, and will be punished accordingly.

<> The role and efficacy of agricultural urea are to regulate the amount of flowers, thin flowers and fruits, rice seed production, and control insect pests. The flowers of peach trees and other plants are sensitive to urea, and the effect of thinning flowers and fruits can be achieved after applying urea. The application of urea can increase the nitrogen content of plant leaves, accelerate the growth of new shoots, inhibit the differentiation of flower buds, and control the number of flower buds.

Urea is a neutral fertilizer that can be used as fertilizer when facing different soils and plants.

1. Promote crop growth. Nitrogen in urea is one of the essential nutrients for the growth and development of crops. If the crop is deficient in nitrogen fertilizer, it will be manifested in the light color of the plant and the yellow of the old leaves at the base; The stems of crops are thin and weak; There are few branches or tillers, and the crop appears prematurely senescence; If the fruit tree is short of nitrogen fertilizer, it will lead to the phenomenon of small fruit, few fruit, thick and hard peel of the fruit starvation tree.

2. Promote the development of new shoots of crops in the growth period. The application of urea to crops during the growth stage can promote the development of new shoots in crops, especially fruit trees. The use of urea on crops can promote the nitrogen tolerance of crop leaves, accelerate the growth of new shoots and inhibit flower buds.

3. Pesticide urea is applied as foliar fertilizer, which can supplement fertilizer for crops and kill pests. After dissolving urea and laundry detergent with water, foliar spraying can quickly supplement fertilizer to crops and effectively kill some pests. The killing performance of soft pests such as cabbage insects, aphids, and red spiders reaches more than 90%.

As a neutral fertilizer, urea is easily absorbed by the leaves and has very little damage to the crop.

Urea, also known as carbamide, is an organic compound composed of carbon, nitrogen, oxygen, and hydrogen, which is a white crystal. One of the simplest organic compounds, it is the main nitrogen-containing end product of protein metabolism in mammals and some fish. It is also the nitrogen fertilizer with the highest nitrogen content at present.

As a neutral fertilizer, urea is suitable for a wide range of soils and plants. It is easy to preserve, easy to use, and has little damage to the soil, and is a chemical nitrogen fertilizer that is currently used in large quantities. Ammonia and carbon dioxide are used in industry to synthesize urea under certain conditions.

Fertilizer urea is a product of animal protein metabolism and is commonly used as nitrogen fertilizer for plants. In addition to chasing, urea has a variety of other uses.

1. Adjust the amount of flowers. In order to overcome the size of apple trees, in the small year, 5 to 6 weeks after flowering (the critical period of apple flower bud differentiation, when the growth of new shoots is slow or stopped, and the nitrogen content of leaves is declining), foliar spraying urea aqueous solution, spraying twice, can improve the nitrogen content of leaves, accelerate the growth of new shoots, inhibit flower bud differentiation, and make the flower amount of the big year suitable.

2. Thin flowers and fruits. The flower apparatus of peach trees is sensitive to urea but the response is slow, so urea was used to thin flowers and fruits in peaches and nectarines abroad. The results showed that the flower and fruit thinning of peach and nectarine required a large concentration ( to show good effect, and the most suitable concentration was 8 12%, and the purpose of flower and fruit thinning could be achieved within 1 2 weeks after spraying.

However, under different soil conditions, the response of different periods and different varieties needs to be further tested.

3. Rice seed production. In hybrid rice seed production technology, in order to improve the outcrossing rate of the parent parent and increase the seed yield of hybrid rice or the amount of sterile line propagation, erythoxin is generally sprayed to reduce the degree of neck wrapping of the female parent or to make it completely withdrawn, or the parent is sprayed to regulate the growth of the two and synchronize the flowering period. Because gibberellin** is more expensive, it is expensive to produce seeds with it.

Urea was used instead of gibberellin for experiments, and urea was used at the peak of booting and the first panicle stage (20 heading), and the propagation effect was similar to that of gibberellin, and the plant height was not increased.

4. Pest control. After stirring and mixing with an appropriate amount of urea, washing powder and water in a ratio of 4:1:400, spraying can prevent fruit trees, vegetable aphids, red spiders, cabbage insects and other pests, and the insecticidal effect is more than 90%.

Urea has the effect of regulating the amount of flowers, thinning flowers and fruits, controlling insect pests and being used as base fertilizer, spraying plants with a concentration of urea solution, can speed up the growth of new shoots, inhibit flower bud differentiation, when the concentration is higher than it, it can play the role of thinning flowers and fruits, and it can control aphids, red spiders, cabbage insects and other pests, and promote plant growth.

1. Adjust the amount of flowers.

Urea can regulate the amount of flowers in plants, the most typical example of which is the problem of apple size. When the apple encounters a small year, spray urea solution to the foliar surface 5-6 weeks after flowering, and spray twice in a row to increase the nitrogen content of the leaves, which can accelerate the growth of new shoots and inhibit the differentiation of flower buds.

2. Thin flowers and fruits.

Spraying plants with a certain concentration of urea can also play a role in thinning flowers and fruits. According to foreign experiments on peaches and nectarines with urea, after spraying urea with a concentration greater than 1-2 weeks, the purpose of thinning flowers and fruits can be achieved, but this effect is also different in different regions, and the appropriate concentration needs to be adjusted according to different varieties.

3. Pest control

Urea also has the effect of preventing and controlling plant diseases and insect pests, with urea, laundry detergent, water in a ratio of 4:1:400 stirring and mixing after spraying plants, you can control fruit trees, vegetables, cotton and other plants on aphids, red spiders, cabbage insects and other pests, the sterilization effect of this mixed solution is more than 90%.

4. Used as base fertilizer

When cultivating plants, urea can be added to the soil as a base fertilizer, which contains high nutritional value and can promote the photosynthesis of plants. Since urea is in a molecular state before transformation and is not easily adsorbed by the soil, it should be prevented from losing with water, and it must be sprayed with deep soil covering.