目前,我国蔬菜的生产水平虽然不断提高,但与先进国家相比差距还很大。例如加拿大的番茄平均亩产2万多公斤,黄瓜平均亩产近4万公斤(加拿大菜商1989年给秦皇岛市蔬菜局来信中介绍),而我国的高产黄瓜只在2.1万公斤左右,番茄不超过1.9万公斤。除了自然因素和设备条件的差距外,在技术上没能广泛推广先进措施,在物资设 At present, although the production level of vegetables in our country continues to increase, the gap with advanced countries is still huge. For example, the average yield of tomato in Canada is over 20,000 kilograms, and the cucumber average yield is nearly 40,000 kilograms (Canadian traders introduced to Qinhuangdao Vegetable Bureau in 1989). In China, the yield of cucumbers is only about 21,000 kilos. Over 19,000 kg. In addition to the natural factors and equipment, the gap between the conditions, the technology did not widely promote advanced measures in the provision of materials