Ammonium bicarbonate: The abbreviation of ammonium bicarbonate, the nitrogen content of 16.5-17.5%, is a white fine granular crystals, easy to absorb moisture, soluble in water, form a hard block after moisture absorption, easy to lose nitrogen in the air, must be kept dry. Ammonium bicarbonate is a fast-acting fertilizer. Suitable for base fertilizers (basic fertilizers) and topdressing fertilizers. Can not be used as seed fertilizers. Deep application is required to prevent ammonia volatilization when applied.
Ammonium Sulphate: It is abbreviated as ammonium sulphate and its nitrogen content is 20-21%. It is a solid nitrogen fertilizer with nitrogen and sulfur nutrition. It is a white rhombohedral crystal and contains light yellow and blue green when it contains impurities. Soluble in water, generally not easy to absorb moisture, but when mixed with alkaline substances can easily cause loss of ammonia volatilization. Ammonium sulfate is a quick-acting fertilizer that can be used as base fertilizer, top dressing and seed fertilizer. Pay attention to deep application of soil in alkaline soil application to avoid evaporation loss of ammonia.
Ammonium chloride: Abbreviated as ammonium chloride, its nitrogen content is 24-25%, it is generally not easy to absorb moisture and agglomerate, and is easily soluble in water, which is a quick-acting fertilizer. In the application can be used as base fertilizer and top dressing, can not be used as fertilizer. Since ammonium chloride contains chloride ions (Cl-), it should not be applied to boiled crops such as potato, sweet potato, tobacco, tea and melon.
Ammonium Nitrate: Ammonium Nitrate for short, with a nitrogen content of 34-35%, white crystals, pale yellow when containing impurities, easily soluble in water, strong hygroscopicity, hygroscopicity and dissolution at high temperature and high humidity to become liquid; ammonium nitrate has Thermal instability, easy to decompose under high temperature, strong combustion resistance and explosiveness, storage, should be placed in a cool dry place, and the stacking height should not exceed three meters, so as to avoid the lower pressure caking, while avoiding together with flammable organics Mixed, ammonium nitrate is a quick-acting fertilizer, suitable for a variety of crops and a variety of soil, can be used as base fertilizer and seed fertilizer, generally not suitable for paddy field application.
Urea: a chemically synthesized organic amide nitrogen fertilizer, white crystal, spherical, with a nitrogen content of 42-46%, easily soluble in water, high temperature and high humidity, easy deliquescence, urea suitable for base fertilizer and top dressing and foliar spray Shi, not suitable for fertilizer, fertilizer efficiency slower than other ammonium nitrate-nitrogen fertilizer, when used as top dressing 3-5 days in advance.
Lime nitrogen, also known as calcium cyanamide, calcium carbonitride, calcium cyanamide, is a dark gray powder, containing a lot of carbon, is a delayed fertilizer. Lime nitrogen should not be applied to alkaline soils. It is not only beneficial to convert urea into acidic soil, but also neutralize the acidity of the soil. The lime nitrogen itself or the intermediate products formed during the conversion process are toxic to the crop. Therefore, lime nitrogen should be used as a base fertilizer, and it should not be used as a top dressing, and it cannot be used as a seed dressing or seed dressing. When basal fertilizer is applied, it is generally applied 1-2 weeks before sowing or transplanting, and crops sensitive to lime nitrogen, such as crucifer crops, potatoes, etc., should be applied at least two weeks in advance. Lime nitrogen is alkaline, it is not appropriate to use centralized application methods such as spraying and acupuncture, so as to avoid local alkaline and cause the formation of dicyandiamide. It is also not advisable to mix with decomposed organic fertilizers to avoid the volatilization of ammonia in organic fertilizers. Nor can it be mixed with water-soluble phosphate fertilizers to reduce the effectiveness of phosphate fertilizers. The toxicity of lime nitrogen has the effect of killing insects, sterilizing, purifying soil, fertilizing soil, and restoring soil physiological activity. It can also be used as a defoliant.
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