urea

CO(NH2)2

White or pale yellow crystals, easily soluble

In water, the nitrogen content does not exceed 46.7%,

Efficient and long-lasting fertilizer, no effect on soil

adverse effect

——

Ammonium bicarbonate

NH4HCO3

White crystal, soluble in water, damp

It can be decomposed at room temperature, the higher the temperature

high, the faster the decomposition, the less

Residual harmful impurities, nitrogen content below

17.7%

Resistant to decomposition, storage and transport

must be sealed. Do not expose to moisture or exposure

Sun, cover or immediately after fertilizing

Irrigation, not with alkaline substances

Mixed use

Ammonium nitrate

NH4NO3

White crystal, soluble in water, high temperature

or easy to explode when subjected to violent impact, including

Nitrogen content is less than 35%, which is harmful to the soil

good influence

Do not use with flammable substances or alkaline

Substances mixed together, clumped together

, do not smash with a hammer

Ammonium sulfate

(NH4)2SO4

White solid, soluble in water, room temperature

Stable in nature, not suitable for long-term large quantities

use, otherwise it will acidify the soil,

hardening

Cannot be mixed with alkaline substances,

Not suitable for long-term heavy use

ammonia

NH3·H2O

Aqueous solution of ammonia gas, volatile and alkaline

For pleasure, storage expansion and use, it is necessary to

Anti-volatile

There are few types of elements, but the content of nutrients is large

Often contains a variety of nutrients, but the content of nutrients is small

Generally soluble in water, easily absorbed by crops, fast fertilizer efficiency

Generally, it is difficult to dissolve in water. After being decomposed, it is gradually converted into a substance that is soluble in water and can be absorbed by crops. The fertilizer effect is slow but the fertilizer period is long.

Convenient for industrial production, high cost

It is easy to obtain materials locally, and the cost is low

Long-term use will destroy the structure of the soil, so that fruits, vegetables and grains contain excessive amounts of fertilizer, which will affect human health; chemical fertilizers will also cause water pollution and cause eutrophication of water.

Can improve soil structure