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Chapter 8-3 Nutrient Relations: Nitrogen N Forms

Nitrogen is available in many forms. The most abundant of these, N2 gas, cannot be used by plants or animals and must be converted by Cyanobacteria or bacteria before plants can use it. Animals can only obtain it by eating other organisms that have already placed the N into amino acids. Other forms of N that plants can absorb include ammonium (NH4), nitrite (NO2), nitrate (NO3 ), and organic forms such as amino acids and urea. As we shall soon see, not all plants have the same ability to use these forms and some are toxic to most taxa.