Soil as a nutrient transformer in crop rotations

abonos fosfatados abonos nitrogenados abonos potasicos azote biomasa biomass biomasse cation cationes cations chernozem chernozems contenido de materia seca dry matter content engrais potassique fertilidad del suelo hordeum vulgare humus ion exchange capacity luvisol luvisoles luvisols nitrogen nitrogen fertilizers nutrition physiology phosphate fertilizers physiologie de la nutrition potash fertilizers rotation culturale rotational cropping sistema poroso del suelo soil fertility soil pore system soil texture soil water retention textura del suelo texture du sol triticum aestivum