Evaluation of some soil factors in relation to the productivity of apple orchards, 1: Effective depth and chemical properties of surface layer in volcanogenous area [Japan]

agronomic characters apples arbre asia asie beverage crops chemicophysical properties crops cultivos cultural soil types depth dimension dimensions economic plants environment environnement fruit crops frutales frutas de clima templado japan japon lithological soil types manzana medio ambiente orchard soils ornamental plants ornamental trees plantas plantas ornamentales plantas para bebidas plante plante de culture plante ornementale plants pomme productividad productivity profitability profondeur profundidad rendement rendimiento rentabilidad site factors soil types sol de verger sol volcanique suelo de huertos temperate fruits trees type de sol type de sol de culture type de sol lithologique volcanic soils yields