【摘要】 通过对天津市蔬菜产业发展状况以及露地与大棚蔬菜的经济、生态效益状况等进行分析,表明大棚蔬菜经济效益是露地蔬菜的2倍,而大棚蔬菜化肥使用量是露地的1.5倍,农膜使用量是露地的7倍,生态效益不容忽视。更多还原

【Abstract】 By analyzing the vegetable development, and economy, ecology benefit of open field and greenhouse in Tianjin, it showed economy benefit of greenhouse was almost twice higher than open field, but the fertilizer use has been increased by 50 percent compared with open field, and the plastic sheeting use was almost seven times more than open field, so ecology benefit could not be ignored.更多还原