Product Description
| Molecular formula |
CH4N2O |
| Purity |
99% |
| Alias |
Urea |
| quality |
High quality |
In 1773, Hilaire Rouelle discovered urea. In 1828, the German chemist Friedrich Wöhler first artificially synthesized urea using inorganic substances ammonium cyanate and ammonium sulfate, kicking off the prelude to the artificial synthesis of organic compounds.
It is a high-concentration nitrogen fertilizer, a neutral and quick-acting fertilizer, suitable for various types of soil and crops. It can be used as base fertilizer and topdressing, and sometimes as seed fertilizer .
-
Solubility: Soluble in water and alcohol, slightly soluble in ether and chloroform.
-
Acidity and alkalinity: Slightly alkaline.
-
Stability: Unstable to heat. When heated to 150 - 160 °C, it will deaminate to form biuret. When heated to 160 °C, it decomposes, producing ammonia gas and turning into cyanic acid.
Product Advantages
-
High nitrogen content: Urea has a nitrogen content of approximately 46%, making it one of the fertilizers with the highest nitrogen content among solid nitrogen fertilizers. This means that a small amount of urea can meet the nitrogen requirements of plants, effectively promoting the vegetative growth of crops, enabling plants to grow rapidly and have dark green leaves. For example, in corn cultivation, it plays an important role in the early seedling raising and late grain filling of corn.
-
Wide applicability: As a neutral fertilizer, urea is suitable for various soils and plants. It can be used as base fertilizer, topdressing, and sometimes as seed fertilizer. It can be applied in both dry and paddy fields and has little destructive effect on the soil.
-
Easy to apply: It can be applied in various ways, such as in the form of granular fertilizers, liquid solutions, or foliar application, adapting to different planting systems and application methods. When applied by foliar spraying, urea can be quickly absorbed through the leaves, which can correct the problem of plant nutrient deficiency in a short period.
-
Low cost: Compared with other nitrogen fertilizers, urea is usually cheaper, with a lower cost per unit of nitrogen. It can help farmers reduce input costs and improve economic efficiency while ensuring the quality of plant nutrition.
Application
-
High - quality nitrogen fertilizer: It is a high - concentration nitrogen fertilizer with a nitrogen content of approximately 46%. It can provide abundant nitrogen elements for crops, promoting the lush growth of crop branches and leaves. It is suitable for various soils and crops and can be used as base fertilizer, top - dressing fertilizer, and sometimes as seed fertilizer. However, when used as seed fertilizer, attention should be paid to controlling the dosage and method to avoid adverse effects on seeds and seedlings.
-
Regulating flower quantity and thinning flowers and fruits: On fruit trees such as apples, in a low - yield year, spraying a 0.5% urea aqueous solution on the leaves 5 - 6 weeks after flowering can increase the nitrogen content in the leaves, inhibit flower bud differentiation, and make the flower quantity in a high - yield year appropriate. On peaches and nectarines, spraying an 8% - 12% urea solution can achieve the purpose of thinning flowers and fruits within 1 - 2 weeks after spraying.
-
Rice seed production: In hybrid rice seed production, using 1.5% - 2% urea during the peak booting stage and initial heading stage can replace gibberellin, reduce the degree of the female parent's neck - enclosure or make it fully emerge, regulate the growth of the male and female parents, synchronize their flowering periods, and will not increase the plant height.
-
Pest control: After mixing urea, washing powder, and clean water in a ratio of 4:1:400, it can control pests such as aphids, spider mites, and diamondback moths on fruit trees, vegetables, and cotton, with a pest - killing effect of over 90%.
Preparation of urea - iron fertilizer: Urea can form chelated iron with Fe2+. This kind of organic iron fertilizer has a low cost and a good effect in preventing iron - deficiency chlorosis. In addition, when spraying 0.3% ferrous sulfate on the leaves and adding 0.3% urea, the effect of preventing chlorosis is better than spraying only 0.3% ferrous sulfate.
Precautions
- Keep the storage environment dry and cool.
Store it in a dry and ventilated place, away from moisture (to prevent caking), and avoid direct sunlight and high temperatures (≤30ºC, to prevent decomposition).
2. Store it in a sealed manner and do not mix it with others.
Use sealed bags or containers to store it, and avoid storing it together with pesticides, fertilizers (such as ammonium bicarbonate), and acid-base substances to prevent volatilization or reactions.
3. Pay attention to safe stacking.
The stacking height should not exceed 2 meters. Raise the bottom layer to prevent moisture. Leave passages between stacks and store urea for different purposes separately.
4. Prevent fire, poisoning and accidental ingestion.
Packaging & Shipping
){kind=link}