Changes in the energy content of field crops in response to fertilizer treatments

engrais liquide engrais potassique fertilizantes fosfatados fertilizantes nitrogenados feuille grain granos hojas leaves liquid fertilizers medicago sativa nitrogen fertilizers nutritive value phosphate fertilizers potash fertilizers racine remolacha azucarera roots stems sugar beet tallo tige trigo de invierno valeur nutritive valor nutritivo winter wheat zea mays