New urea can be divided into existing products according to the existing products can be divided into: physical modification of urea - large particles of urea; coated urea - sulfur, resin, nutrients, including mineral powder; stability of urea - containing nitrification inhibitors, containing urease Inhibitors, containing complex inhibitors; poly urea urea - poly urea, peptide urea; fertilizer urea - zinc, boron, silicon and so on.
Large-particle urea: It is a kind of urea product with large particles after secondary condensation in the presence of formaldehyde. Compared with ordinary urea, it has a smooth surface, uniform particles and is not easy to agglomerate. Its characteristics are: 1. Low dust content, high particle strength, good fluidity, can be bulk transport, not easy to crush and agglomerate, suitable for mechanized fertilization; 2. Small surface area, slower dissolution rate after application into the soil, plus The upper single grain weight is larger, and it can be sunk into deep soil under the application in the paddy fields to reduce the loss of volatilization. 3. Due to the different urine concentration requirements of the processing technology, the content of biuret in the large-granule urea products is generally low. This is good for the crop.
Coated urea: A type of fertilizer that coats the outer surface of urea with one or more layers of permeation and diffusion barriers to slow or control the rate of dissolution of nutrients from fertilizers. Its coating materials are divided into organic and inorganic materials. Inorganic coating materials include: sulfur, silicate, phosphate rock, gypsum, calcium magnesium phosphate, bentonite and so on. Organic coating materials include: Natural rubber, natural rubber, shellac, cellulose, lignin, starch, chitin, etc. Organic coated materials are characterized by a wide range of sources and are easily biodegradable. They are environmentally friendly and suitable for slow release fertilizers.
Problems with coated urea: First, the disadvantages of the coating material itself, such as the resin-coated fertilizer, require a large amount of organic solvents to increase the cost; secondly, the problem of the nutrient release of coated urea and crop absorption; The hole technology does not pass; the fourth is the environmental problem, which easily brings secondary pollution; Fifth, the cost is high and the industrialization is difficult.
Stability urea: Through a certain process in the urea granulation process by adding a certain dose of urease inhibitors, nitrification inhibitors or urease inhibitors and nitrification inhibitor combination, and the formation of new urea varieties, can slow urea hydrolysis, control NO3- The formation of nitrogen nutrients in the soil to maintain longer time and improve effectiveness. Inhibitors - the core of stable fertilizers, including nitrification inhibitors and urease inhibitors.
The characteristics of stable urea: First, the long period of fertilizer effect, up to 100-120 days, which is twice that of ordinary urea; Second, the utilization of nutrients is high, and the utilization rate of nitrogen is increased from 30%-34% to 42%-45%; It is an increase in production of fertilizer, an average increase of 8% -18%, and a 20% reduction in fertilizer yield without reduction in production. Fourth, it saves time and labor and realizes one-time fertilization of field crops to avoid top dressing. Fifth, it is environmentally friendly and effectively reduces the environment caused by fertilization. Pollution; Sixth, the unit cost is low, and the price increase is only 3.6%-4.0% of ordinary urea.
Polymeric amino acid urea: A type of urea produced on the basis of traditional urea and added with a synthesizing synergist. The poly-alkane polymer compound functions as an ion pump and can enhance the absorption of nitrogen, phosphorus, potassium and trace elements. . At present, there are two main categories: poly-urea urea and polypeptide urea.
Polyurea urea refers to urea formed by adding a biosynthetic polyglutamic acid polymer (molecular weight 800,000-1.3 million). Its characteristics: It can play the role of ion pump to increase the affinity of ionic nutrients and root system, increase nutrient absorption and operation rate, increase crop yield by 7%-30%, and effectively increase nutrient utilization rate of fertilizer (N increase 24%-32 %); can reduce fertilizer input (reduction of nitrogen input 15% -20%); product does not harm humans, livestock, plants, in line with the requirements of green agricultural production. As for polypeptide urea, there is still relatively little research on this species in China.
With trace elements urea. Unit trace element urea: contains trace elements such as zinc, copper, iron, manganese and boron. Multielement trace element urea: Boron, copper, zinc and other trace elements and urea fused together can be prepared into multi-element fertilizer urea complex fertilizer. Humic acid urea: humic acid and urea are fused together.
Features of urea containing trace elements: 1. Contain multiple nutrient elements; 2. Reduce the number of fertilization, trace fertilizers enter with top dressing; 3. The amount is limited by trace elements, the amount will cause excessive surplus of trace fertilizers; 4. Join the process Urea production systems may have certain risks.
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