The factory sells organic water soluble fertilizer urea agricultural grade to 46% of China urea carbamide

It is a kind of high concentration nitrogen fertilizer, which is a neutral quick - acting fertilizer and can also be used to produce a variety of compound fertilizers. No harmful substances are left in the soil, and long-term application has no adverse effects. Animal husbandry can be used as feed for ruminants. But in the granulation temperature too high will produce a small amount of biuret, also known as biuret, has the inhibitory effect on the crops. China's regulation of fertilizer urea biureide content should be less than 0.5%. When the content of biureide exceeds 1%, seed fertilizer, seedling fertilizer and foliar fertilizer should not be used, and the urea content in other application periods should not be too much or too concentrated.

The production pathway of urea in plants

Urea is organic nitrogen fertilizer, after the urease in the soil, hydrolysis into ammonium carbonate or ammonium bicarbonate, can be absorbed by crops. Therefore, urea should be applied 4 to 8 days before the fertilizer requirement of the crop.

Urea is used as base fertilizer and topdressing, and sometimes as seed fertilizer. Before conversion, urea is molecular and cannot be adsorbed by soil, so it should be prevented from losing with water. The resulting ammonia is also volatile, so urea is also heavily coated. (soil transformation) a small part of the soil is dissolved in the soil solution in molecular form and adsorbed by the soil through hydrogen bond. Most of the others are hydrolyzed into ammonium carbonate under the action of urease, which then generates carbonic acid and ammonium hydroxide. Then ammonium ions can be absorbed by plants and soil colloid adsorption, bicarbonate ions can also be absorbed by plants, so urea into the soil without leaving any harmful components. In addition, diureas contained in urea can also be decomposed into ammonia and carbonic acid under the action of urease. The conversion of urea in soil is affected by the soil PH value, temperature and water, and the reaction is neutral in soil. The higher the soil temperature is, the faster the conversion will be. When the soil temperature is 10℃, it takes 7-10 days for urea to completely convert to ammonium nitrogen; when it is 20℃, it takes 4-5 days; when it is 30℃, it takes 2-3 days. Ammonium nitrogen is generated after the hydrolysis of urea, and ammonia volatilization will be caused by surface application, especially in alkaline or alkaline soil. Therefore, when applying urea, deep soil should be applied, and paddy fields should be applied to the reducing layer.

Urea is suitable for all crops and all soils. It can be used as base and topdressing and can be used in dry and paddy fields. Because urea can accumulate a large number of ammonium ions in soil conversion, which will lead to a PH rise of 2-3 units. In addition, urea itself contains a certain amount of diureide, which will inhibit the young roots and buds of crops when its concentration is at 500ppm. Therefore, urea should not be used as seed fertilizer.

Urea (nitrogen fertilizer) can promote cell division and growth, so that branches and leaves grow luxuriant.

use

It can be used as a large number of melamine, urea formaldehyde resin, hydrazine hydrate, tetracycline, phenobarbital, caffeine, reduced brown BR, phthalein blue B, phthalein blue Bx, monosodium glutamate and other products production raw materials.

Adjust the volume of flowers

In order to overcome the apple DaXiaoNian, meet in small, to a flower after 5 to 6 weeks (apple the critical period of flower bud differentiation, new shoots grow slowly or stop, nitrogen content of leaves had a descending trend) spraying on the leaf 0.5% urea aqueous solution, even 2 times, can improve the leaf nitrogen content, to speed up the new shoots growth inhibition of flower bud differentiation, the annual amount of flower is appropriate.

Thin flower thinning

Peach flower implement of urea sensitive but honk surface reaction is slow, so foreign dredging of peach and nectarine flowers with urea fruit thinning experiments, the results showed that the hydrophobic of peach and nectarine fruit thinning, larger concentration (7.4%) is needed to show good effect, the most suitable concentration was 8% - 12%, 1-2 weeks after injection, which can achieve the goal of thin flower thinning. However, the reaction of different time and species under different land conditions needs to be further tested.

Rice seed

In hybrid rice seed production technology, in order to improve the cross-breeding rate of parents and increase the number of hybrid rice seed production or the number of sterile lines, the mother seeds are usually sprayed with red toxin to reduce the degree of the mother seeds or make the mother seeds completely drawn out. Or spray the parents, regulate the growth of both, so that the flowering period synchronization. Because of the high price of gibberellin, seed production cost is high. People used urea instead of gibberellin in the experiment. 1.5-2% urea was used at the peak and beginning stages (20% heading) of the buretting period, and the effect of proliferation was similar to that of gibberellin without increasing plant height.

Prevention and control of pests

With urea, washing powder, water 4:1:40, mixing well, can prevent fruit trees, vegetables, cotton aphids, red spider, vegetables and other insect pests, insect control effect of more than 90%.

Urea iron fertilizer

Urea forms iron chelate with Fe2+ in the form of complex. This organic iron fertilizer is low in cost and effective in preventing iron deficiency and green loss. In addition, 0.3% urea was added formaldehyde resins;

Raw materials for certain gums;

Composition of fertilizers and feed;

Instead of freezing salt in the streets, the advantage is not to make the metal corrosion;

Enhancing the smell of cigarettes;

Brown industrial pretzels;

Ingredients in certain shampoos and detergents;

Ingredients of emergency refrigeration kits, because urea reacts with water to absorb heat;

The exhaust gas from diesel, engine and thermal power plant can be treated with vehicle urea, especially the nitrogen oxides can be reduced.

Composition of rain precipitator < > with salt;

Used to separate paraffins because urea forms inclusion compounds;

Refractory material;

Ingredients of environmentally friendly engine fuel;

Ingredients in whitening products;

For chemical fertilizers;

An important aid in dyeing and printing.

Laboratory applications:

Urea is very effective in denaturating proteins and in particular in destroying non-covalent bonding proteins. This characteristic increases the solubility of certain proteins at concentrations of up to 10 mol/volume. Urea can also be used to make urea nitrate.

Feed additives:

The shortage of human food resources and protein has also caused a big problem in the feed industry. The industry actively seeks new sources of protein and extends to nitrogen sources other than protein, such as urea, which is high in nitrogen.