Urea, also known as carboxamide, is a white crystal that is one of the simplest organic compounds and is currently the highest nitrogen fertilizer in the world. It is a common fertilizer for farmers and a relatively large amount of fertilizer. Its low cost and quick effect, no harmful substances in the soil are essential agricultural products for agricultural survival. The demand for urea in the market is large, the price is transparent, and the retailer's profit is low. The so-called “urea†in the market, which is called “scratching the ball†and “stealing the beamâ€, can be described as a revamp of the pattern, and the mixed fish and dragons dazzle the farmers.
Common methods for distinguishing between true and false urea: "one look, two check, three scales, four touches, five burns, six smells." I won't go into details here. Here, you can identify the true and false urea by looking for the following two "keywords" on the package.
Keyword 1: GB 2440—2001
The national standard for urea is: GB 2440—2001, which means that the national standard number must be clearly marked on the packaging bag. Strictly speaking, "urea" which is not marked on the packaging bag GB 2440-2001 is not urea. This is very important, the standard qualification mark is as follows:
Many small fertilizer manufacturers work hard on the word "urea". Create some new, "urea" that is conceptual and exaggerated. The implementation standards marked on the package are not GB 2440-2001. GB is the national standard, and many manufacturers mark the enterprise standard, as shown below:
There are also many manufacturers selling urea with 25% ammonium chloride. Often marked as GB/T2946-2008, are all ammonium chloride. The package is marked with N ≥ 25% S ≥ 8% Zn ≥ 2%, etc., and all nutrients are added up to make up 46%. As shown below:
It is not that ammonium chloride is not good. In fact, ammonium chloride is a good top dressing, especially for rice topdressing. Rather, the cost of ammonium chloride is much lower than the urea price.
Keyword two: 46%
The symbol “N†stands for “nitrogenâ€. Many farmers’ friends don’t even know the signs of these nutrients marked on the fertilizer bag: if “phosphorus†must be marked as “P†or “P2O5â€, “potassium†must be marked. It is "K" or "K2O". In particular, compound fertilizer depends on “total nutrients†and must not be “total active ingredientsâ€. Anything that is not labeled as standard may be fake fertilizer.
It is well known that the total nitrogen content of urea is ≥46%, and the standard is to specify the total nitrogen or nitrogen content in the package, such as "N ≥ 46.4%" or "total nitrogen ≥ 46.4%". Any total nitrogen content below 46% cannot be called “urea†and should be labeled as “nitrogen fertilizerâ€.
Such as marked as the total active ingredient ≥ 46%, or add other elements such as sulfur, zinc, manganese, etc. to the content such as "N·Zn·S ≥ 46%" or "N ≥ 20% S ≥ 9% None of Zn ≥ 2% can be labeled as “urea†and can only be labeled as “nitrogen fertilizerâ€. As shown below:
What is the reason for the existence of so many "urea" in the market? It is true that the price of urea is transparent, the profit is low, and the demand is large. Fertilizer dealers do not make money by selling urea, except for loading and unloading each bag only earns 1~ 5 yuan, even when the market is volatile, even lose money to sell.
And selling these so-called "urea" has a profit, even if the market price is lower than the urea price, there is still no small profit, and then grab the habit of the farmers to apply a large amount of fertilizer in recent years, originally wheat, corn topdressing per acre of urea 20-40 kg can be the amount, often farmers have to catch 80-100 kg per mu, so farmers buy these "urea" according to the amount of 80-100 kg per acre to catch the ground, according to the nitrogen-containing crop growth is enough The effect is still there, and the peasants can’t tell the difference between good and bad;
In addition, "a slap in the face does not sound", many peasant friends have the psychology of "small money, buy good goods", as well as the psychology of coveting cheap, resulting in the existence of the "product" of the "market" It is said that "there will be a market if there is demand", so these "urea" that "steal the beam and change the column" can be sold unscrupulously. Keep in mind that "a penny and a share of goods", there is no "good quality and low price" in the world, you will not be deceived! (Farmers Network)
Urea uses seven notes:
1. It should not be mixed with or applied with alkaline fertilizer.
After urea is applied, it must be converted into ammonia nitrogen to produce fertilizer effect. Under alkaline conditions, most of the nitrogen will become ammonia gas, so urea can not be alkaline with lime, grass ash, calcium magnesium phosphate. Fertilizer application or simultaneous application. Generally speaking, in summer and autumn, urea and alkaline fertilizer should be staggered for 3 to 4 days, and winter and spring should be staggered for 7 to 8 days.
Second, it is not suitable for seed dressing
In the production process, urea often produces a small amount of biuret. When the biuret content exceeds 2%, it will poison the seeds and seedlings. Such urea enters the seeds and seedlings, which will denature the protein and affect the seed germination. Seedlings grow, so it is not suitable for seed fertilizer. If it must be applied as a seed fertilizer, avoid contact with seeds and fertilizers, and control the dosage.
Third, it is not appropriate to apply water immediately after application
Urea is an amide nitrogen fertilizer, which can be converted into ammonia nitrogen to be absorbed and utilized by crop roots. The transformation process varies depending on soil, water and temperature, and the time is long and short. Generally, it takes 2 to 10 days to complete. Immediately after irrigation or dry land is applied before heavy rain, urea will dissolve in the water and be lost. Generally, summer and autumn seasons should be watered 2 to 3 days after application, and water should be watered after 7 to 8 days after application.
Fourth, it is not appropriate to spread the surface
Urea is applied to the surface and can be used after 4 to 5 days of transformation at room temperature. Most of the nitrogen is easily volatilized during the ammoniation process. The actual utilization rate is only about 30%, if it is in alkaline soil and organic matter content. When the soil is applied in high soil, the loss of nitrogen will be faster and more.
Moreover, the shallow application of urea is easy to be consumed by weeds. Deep application of urea, melt fertilizer in the soil, so that the fertilizer is in the moist soil layer, is conducive to the performance of fertilizer. For the topdressing should be applied to the seedlings or the ditch on the side of the seedling, the depth should be about 10~15cm. In this way, urea is concentrated in the dense layer of the roots, which is convenient for crops to be absorbed and utilized. Tests have shown that deep application can increase the utilization rate of urea by 10% to 30%.
Five, should not be used too much
Urea has a high nitrogen content, and the application rate should not be too large, so as to avoid unnecessary waste and "fat damage". Generally, 5 to 15 kg per mu is applied, and 15 to 20 kg per acre is applied to the paddy field. Excessive application, can not be absorbed by the soil before conversion to ammonium bicarbonate, easily leached by rain, and easily damage crops. At the same time, too much urea is applied, most of which is lost, and entering the groundwater will cause nitrogen pollution in the water body, causing the deposition of nitrite, which seriously affects the safety of humans and animals.
Six, not suitable for high concentration foliar application
Among all nitrogen fertilizers, urea is the most ideal foliar fertilizer. Spraying urea, the amount and speed of protein synthesis in crops exceeds that of other nitrogen fertilizers. However, when the foliar spray is applied, the concentration of the urea solution should not be too large, otherwise the leaves will be burned and the plants will be poisoned.
Seven, should not be applied too late
The application of urea is too late, which is not conducive to the exertion of fertilizer efficiency, and it is easy to cause crops to be late and mature, so it should be applied 4 to 7 days earlier than other nitrogen fertilizers.
This article URL: Urea packaging logo, learn how to see if it is a qualified product through packaging
Lowering Blood Lipids Plant Extract
Lowering Blood Lipids Plant Extract,Iso Plantain Extract,Water Soluble Plantain Extract,Platycodon Grandiflorum Root Extract
Fufeng Sinuote Biotechnology Co.,Ltd. , https://www.sinuotebio.com