The positive analysis of the relation between field condition and farm management in the terrace upland citrus fruits farming area, Nakajima town, Ehime prefecture [Japan]

agrarian reform agricultural structure agrume asia asie citrus fruits crops cultivos economic plants facteur de production farm management fruit crops frutales gestion de l'exploitation agricole huerto frutal islands islas japan japon labour productivity land land consolidation land reform manejo de fincas naranja dulce orange orchards physiographic features plantas plante plante de culture plants production factors productividad productividad del trabajo productivity reforma agraria reforma de la tenencia de la tierra remembrement sloping land structure agricole sweet oranges terre terre en pente terreno en declive tierras verger