成都市郊区农民的蔬菜套作栽培有四十多年的历史,一般一年七、八熟。它的好处是扩大复种指数,提高单位面积产量;增加鲜菜供应种类,延长供应时期,减轻蔬菜淡旺季生产的矛盾;充分发挥人力和肥料的效能,因而能更好的满足城市人民的需要,增加 Vegetables in suburban areas of Chengdu are cultivated for more than 40 years and are generally cooked seven or eight times a year. Its advantages are to expand the crop multiplication index and increase yield per unit area; to increase the supply of fresh vegetables, to extend the supply period and to reduce the contradiction between vegetable production during the peak season and the season; to give full play to the manpower and manure effectiveness so as to better meet the needs of the urban people, increase