上海郊区自1973年始建塑料大、中棚蔬菜保护地以来,发展迅速,目前已建成塑料大、中棚1.2万亩,占常年菜地的6％。这些保护地设施对蔬菜育苗、留种和促进栽培中,发挥了重要作用。但由于大棚内特殊的温湿条件和水肥、耕作管理,已导致一些蔬菜作物出现不同程度的生理障碍及病害。其 The suburbs of Shanghai have been growing rapidly since the construction of large plastic shelters and vegetable shelves in 1973. Up to now, 12,000 mu of plastic shelves have been built, accounting for 6% of the perennial vegetable fields. These protective facilities have played an important role in vegetable nurturing, inoculating and promoting cultivation. However, due to the special temperature and humidity conditions in the greenhouse and water and fertilizer, tillage management has led to some degree of physical disturbance and disease in some vegetable crops. its