Effect of field calcium sprays and fruit density per tree on physical-mechanical properties and quality of Passe Crassane and Conference pears

arbre fruitier bouillie calcio calcium calidad control de enfermedades control de plagas (postcosecha) crop performance densidad density disease control disease resistance dosage effects espagne firmeza firmness fruit trees handling huerto frutal losses manutention mechanical damage orchards pears penicillium expansum pera performance de culture perte podredumbres poire postharvest control pourriture pyrus quality resistencia a la enfermedad rots spain sprays variedades varieties verger