Maize root system growth and development as influenced by phosphorus deficiency

biomasa biomass biomasse carbohidratos carbohydrates contenido de materia seca crecimiento croissance deficiencia de minerales dry matter content emergence emergencia fosforo glucide growth leaf area mais maize mineral deficiencies morphogenese morphogenesis nutrition des plantes phosphore phosphorus plant nutrition racine radiation roots stems superficie foliar surface foliaire tallo tige zea mays