Tree forms for labor saving farm work, 4: Operation studies of pruning about two training systems in peach tree, three scaffold branches type and two scaffold branches type

agronomic characters arborescence conduite de la plante crops cultivation cultivo cultivos durazno economic plants fruit crops frutales frutas de clima templado labour productivity methode methods peaches plant habit plant training plantas plante plante de culture plants poda port de la plante pratique culturale productividad productividad del trabajo productivity pruning taille temperate fruits tree form