The effect of some pollutants on crop production

age application rates azote cadmio cadmium cambisol cambisoles cambisols chemical contamination cinc climatic factors contaminantes contamination chimique crop yield deterioro del suelo dose d'application edad facteur climatique fitotoxicidad fluor fluorine nitrogen phytotoxicity polluant pollutants potasio potassium rendement des cultures rendimiento de cultivos soil deterioration zea mays zinc