| Message: | Urea used for hydroponic fertilizer for greenhouse
Product Description
Chemical formula: CO (NH2) 2,
molecular weight 60.06
nitrogen content :46.67%.
density :1.335 g/cm3
Melting point:132.7 ℃
Properties:Soluble in water, ethanol and benzene, insoluble in ether and chloroform.White crystal, odorless, hygroscopic.Melting point 135 ℃ (decomposition), relative density d2041.323.In high temperature, the condensation reaction can be used to produce biurea, triurea and tripolycyanate.Heated to 160 ℃ decomposition, to produce ammonia at the same time into cyanate.
Use:Urea is a high concentration of nitrogen fertilizer, which is a neutral quick-acting fertilizer, and can also be used to produce many kinds of compound fertilizer.
No harmful substances are left in the soil.
No adverse effects can be found in long-term application.
However, the high temperature in the granule produces a small amount of biuret, which is also called biuret, which has inhibitory effect on the crops.
The content of urea biuret in fertilizer should be less than 0.5% in China.
When the content of biuret is more than 1%, it can not be used as fertilizer, fertilizer and leaf surface fertilizer, and the amount of urea in other application period should not be too much or too concentrated.
Urea is an organic nitrogen fertilizer, which can be absorbed by the crop after being hydrolyzed into ammonium carbonate or ammonium bicarbonate. Therefore, urea should be applied 4 ~ 8 days before the crop needs fertilizer.urea4.jpgUrea1.jpgUrea5.jpgurea4.jpgurea6.jpg
|
my account
