Corn yield, nitrogen uptake and nitrogen use efficiency as influenced by nitrogen fertilization

abonos abonos nitrogenados absorption de substances nutritives application rates chemical composition clay soils composition chimique crop yield dose d'application efficiency eficacia engrais exigence des plantes fertilizers necesidades de las plantas nitrogen content nitrogen fertilizers nutrient uptake plant requirements quebec rendement des cultures rendimiento de cultivos sol argileux suelo arcilloso teneur en azote textural soil types tipos texturales de suelos type de sol textural uses usos utilisation zea mays