在南朝鲜南端全罗南道(北纬35°以南)的部分农民于1988年采用地膜新品种——双色条纹有孔地膜覆盖芝麻、大豆等作物,获得了出乎意料的高产。试验表明,与普通透明膜相比,使用这种新型地膜可使芝麻增产40%。这种新型地膜为黑白相间的条纹型,如图1所示,条纹A为黑色,条纹B为白色,条纹C亦为黑色,但有孔。使用时,如图2所示,条纹A覆盖于垅沟处,条 In 1988, some peasants in southern Jeolla Province, south of Jeollanam-do (latitude 35 ° north latitude), achieved unexpectedly high yield with a new film of double-color striped perforated film covering sesame seeds and soybeans. Tests show that, compared with ordinary transparent film, the use of this new type of film can make sesame yield 40%. The new type of film is a black-and-white stripe pattern, as shown in Figure 1, stripe A is black, stripe B is white, stripe C is also black, but with holes. When used, as shown in FIG. 2, stripes A cover the gutter, stripes