Granular Urea

UREA

granular urea Physical and chemical properties:

Appearance: Colorless crystals

Density 1.335

Melting point 131-135 ° C

Water solubility 1080 g/L (20 ° C)

granular urea Identify:

Take 0.5g of this product, heat it in a test tube, liquefy it, and release ammonia gas; Continue heating until the liquid becomes turbid, cool down, dissolve 10ml of water and 2ml of sodium hydroxide test solution, add 1 drop of copper sulfate test solution, and it will turn purple red.

granular urea Application method:

The leaves of general crops absorb and utilize urea faster than the roots, and urea is more effective as an external fertilizer than other nitrogen fertilizers. The reason for this is that: ① urea is a neutral organic nitrogen that does not contain by-products, and the spraying solution at a general concentration has little burning effect on crop stems and leaves. ② The ionization degree is very low, and the molecular volume is also small, making it easy to enter leaf cells through the cell membrane Molecular urea has a high permeation and diffusion rate, and when it penetrates cells, it is not easily separated from the cell wall. Even if it does occur, it is easy to recover It has strong hygroscopicity. The solid urea remaining on the leaves due to the evaporation of spray water can still absorb moisture and dissolve, resulting in a high absorption and utilization rate.

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