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Nitrogen is required by plants to form proteins. This soil is absorbed in the form of nitrate ion and mostly as ammonia and then transform it into nitrogenous organic molecules such as amino acids and proteins for the development of plant tissue.

Virtually all types of soils are deficient in nitrogen, so that the supply of nitrogen fertilizers is a necessity, widespread, for those areas where it is needed to increase productivity. Fertilization usually occurs in the stage of preparing the ground before sowing or planting, then, for her and later as fertilizer.

Products that are capable of fertilizing with nitrogen, are the organic type, such as urea and manure, and inorganic type, based on ammonium salts and nitrates.

Nitrogen Products:

A.-ammonia (NH3) in anhydrous (approximately 82% of N) or in aqueous solution (approximately 25% of N) is applied directly to the soil to a depth of 15 cm, as a high pressure liquid, then of which spreads in moist soil or absorbed in the colloids. In solution can be applied through irrigation water.
Produce an acidifying effect on soil, as well as the remaining ammonium fertilizers, due to the nitrification process.

B.-Ammonium Nitrate (NH4NO3) is a fertilizer high in N (33% approximately), which is used in a Prelate (round granules). Being hygroscopic, is treated with kaolin to prevent caking. Its management must be careful of fire and explosion. It can also be mixed with lime in a 3:2 ratio (ammonium nitrate
calcium). The reaction in the soil can be neutral or alkaline.

C-Urea [CO (NH2) 2] is an organic product, constituting a very high fertilizer ammonia N (45-46% approximately), the form allows a direct application Prelate. Nitrogen fertilizer is the market leader for low cost per unit of nitrogen, thanks to that obtained in the synthesis of ammonia and carbon dioxide under high temperature and pressure. When applied on the ground, there is an enzymatic hydrolysis becoming ammonium carbonate acting as a fertilizer ammonia and then quickly turns to nitric.

D.-Ammonium Sulfate [(NH4) 2804] is a nitrogenous fertilizer (20.5% N containing approximately) useful in sulfur deficient soils. Microcrystalline salt is generally included in fertilizer mixtures. Is mainly produced as a byproduct in steelmaking processes and in synthetic form. One of the most acidifying fertilizer.