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塑料大棚蔬菜生产在我国东北、西北和华北等地区发展很快。它的优越性表现在其栽培和供菜期比露地提早和延后各30～50天,而单产又比露地高产田还要高1～2倍。但在大棚生产中仍然存在一些问题:①产量的潜力还未充分发挥,茄果类生产水平较低,单产除蕃茄外,还未突破2万斤大关(丹麦蕃茄全国平均单产为2.35万斤),我国高产黄瓜与世界水平差距很大(世界高产黄瓜单产达7万斤,美国全国平均黄瓜单产为2.73万斤)。②品种方面种类少而比较单调,如黄瓜多,茄果类少,其它瓜类、豆类和叶菜类也较少,特别是缺少适于大棚生产的专门品种。③大棚栽培而积的利用还不
Plastic greenhouse vegetable production in China’s northeast, northwest and north China and other regions developed rapidly. Its superiority is manifested in its cultivation and supply period earlier than the open field and delayed 30 to 50 days, while the yield is higher than the open field 1 to 2 times higher yield field. However, there are still some problems in the production of greenhouses: (1) the potential of yield has not been brought into full play; the level of eggplant production is relatively low; the yield of tomatoes and tomatoes has not exceeded 2 kgs (the average yield of Danish tomatoes is 2.35 kg ), There is a big gap between the high-yield cucumbers in China and the world level (the yield of cucumber in the world is up to 70,000 kg and that of the United States averagely is 27,300 kg). ② species species is relatively small and relatively monotonous, such as cucumber and eggplant less, other melons, beans and leafy vegetables are also less, especially the lack of special varieties suitable for the production of greenhouses. ③ greenhouse cultivation and plot utilization is not yet