Nitrogen Balance and pentavalent Tri:

Nitrogen Balance tri and pentavalent:

The trivalent nitrogen (eg ammonia or a compound convertible to ammonia as urea) and the pentavalent nitrogen (as nitrate) are specific nitrogen sources, and due to its high energy requirement of the plant itself when applied and concern for its impact ecological, are major concern in the energy balance and general.

The trivalent nitrogen such as urea, requires much less energy compared to the pentavalent assimilation (nitrate).

The reduction of nitrate to ammonium using NADH as a source of energy, you need 198 Kcal / gr. Mol and assimilation aprox.51Kcal subsequent steps, making a total of 241 Kcal (!!...).

By applying nitrogen as urea would save 198 kcal comparatively, yet the application of trivalent nitrogen as the sole source of nitrogen could be dangerous, as their rapid assimilation

It can cause a sudden "dry" carbon skeleton and a massive loss of energy by plants. If the plant has abundant reserves, this could be overcome by the crop, but in most cases can erode the reserves to dangerous levels, weakening the plant, this last or is

Below level of relationship Carbohydrates: Nitrogen

(CHO <-> N) promotes rapid vegetative growth and little or no high suceptilidad reproductive and cultivation of adverse factors.

In addition, the ammonium ion can inhibit electron transport systems in photosynthesis and in such cases be toxic to plants. Urea forms can be transformed, via urease (enzyme) in ammonia with a similar result to the name. High concentrations of urea can denature proteins by breaking sulfohidrilicos ligaments and disruption of the tertiary structure of the molecules and if the protein is an enzyme may be distorted to the point of creating a cascade of biochemical reactions in chain.

HIGHLIGHT OF THE FOREGOING THE IMPORTANCE OF BALANCE OF APPLICATION OF THE TWO FORMS OF NITROGEN IN CROP.

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