Product features:
1. Urea nitrogen content is more than 46%, which is the highest nitrogen fertilizer in solid nitrogen fertilizer. Urea is a kind of high concentration nitrogen fertilizer, and it is a neutral and fast fertilizer. No harmful substances remain in the soil, and long-term application has no adverse effects.
2. Urea is an organic nitrogen fertilizer, which is hydrolyzed into ammonium carbonate or ammonium bicarbonate by urease in the soil before it can be absorbed and utilized by crops. Therefore, urea should be applied 4 to 8 days before the crop needs fertilizer.
3. A small part of the application into the soil is dissolved in the soil solution in a molecular state and adsorbed by the soil through hydrogen bonding, while the rest is hydrolyzed into ammonium carbonate under the action of urease, and then hydrogen carboxate and ammonium hydroxide are generated. Then NH4+ can be absorbed by plants and soil colloid adsorption, NCO3- can also be absorbed by plants, so urea does not remain any harmful components after application into the soil.
4, easy to dissolve in water, before the application of soil physical and chemical properties is relatively stable, hygroscopicity is relatively small, is a more stable commercial shape of rapid nitrogen fertilizer.
Scope of application:
Urea is suitable for all crops and all soils, can be used as base fertilizer and topdressing, dry paddy fields can be applied. Widely used as melamine, urea formaldehyde resin, medicine, compound fertilizer and other production raw materials. At the same time, it is widely used in feed additives, automotive urea, etc.
How to use:
When urea is used as topdressing, it can be applied to the roots of crops through soil, and it is also suitable for foliar spraying. When it is necessary to use urea as soil topdressing in the flowering period of crops, pay attention to the fertilization period to be applied in advance than the fast-effective nitrogen fertilizer varieties such as ammonium sulfide and ammonium carbide, how many days in advance depends on the season and temperature, 6 to 8 days in early spring weather (low temperature 10 degrees), 3 to 4 days in late spring and early summer (16 to 20 degrees), and 1 to 2 days in advance in summer. Urea for root topdressing, suitable for foliation of various crops, the appropriate concentration is generally between 0.1% and 0.5%, depending on the type of crop and growth period. When urea is used for foliar spraying, it must be noted that the content of biuret must be less than 0.5%. In addition, the use of urea and potassium dihydrogen phosphate mixture as root topdressing, sprayed on the leaves of wheat or corn crops, is conducive to their grouting to increase the 1000-grain weight. The urea contained in foliar fertilizer is beneficial to the absorption of phosphorus and potassium.