Response of apple trees to fertigation-induced soil acidification

acidification ammonium nitrate ammonium phosphate application rates british columbia calcio calcium calidad cobre colombie britannique copper crop yield cuivre disponibilidad de nutrientes dose d'application fertigation feuille fosfato de amonio fruit crops frutales hojas irrigation fertilisante leaves magnesio magnesium malus pumila manganese manganeso nitrate d'ammonium nitrato de amonio nutrient availability nutrition des plantes ph phosphate d'ammonium plant nutrition polifosfatos polyphosphate polyphosphates potasio potassium quality rendement des cultures rendimiento de cultivos sandy soils soil chemicophysical properties sol sableux suelo arenoso