搞好地瓜育苗,是提高地瓜产量的重要保证。近年来,山东、江苏等地,在实践中总结出一种地瓜双膜育苗法,各地不妨一试。所谓双膜育苗法,就是在冷床(或酿热物温床)覆盖薄膜育苗的基础上,再在苗床表面加盖一层地膜。这种方法比单膜覆盖增温快、保温效 Good potato sweet potatoes, is an important guarantee to increase sweet potato production. In recent years, Shandong, Jiangsu and other places, in practice summed up a sweet potato double-membrane nursery method, may wish to try around. The so-called double-membrane nursery method, that is, in the cold bed (or brewing hotbed) covered film nursery based on the seedbed surface and then covered with a layer of plastic film. This method is faster than a single membrane warming, thermal insulation effect