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Facultad de ciencias agrarias

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lunes, 31 de agosto de 2015

INTRODUCCION

El nitrógeno es un elemento químico, de número atómico 7 y 14 de peso atómico, símbolo N, a diferencia del potasio y del fósforo, el nitrógeno no proviene de la descomposición de la roca madre. Si no más bien de algunas rocas que tienen este compuesto en pocas cantidades.