目前,正值农膜覆盖季节,市场上出售的农膜品种繁多,薄厚不一,农民朋友一时难以选择,究竟哪一种农膜效果明显、经济合算呢?农技专家认为,选择地膜,应该考虑使用农膜的地里区域、气候环境等多种因素。我国地域辽阔,气候条件南北差异很大,南方气候湿润,平均温度较高,选用薄一些的地膜比较合算,北方则气候干燥,而且遇风沙容易破裂、穿孔,使用过薄的农膜反而造成浪费。农作物不同,种植时期也不相同,如玉米、蔬菜等作物,一般在清明前后栽植,此时气温在4～16℃之间,昼夜温差较大,且有时因受寒流的影响,最低气温甚至达到0℃左右,因此为了提高地温,确保幼苗的生长,就应该选用厚一点的地膜,而在立夏前后栽植的作物,则可采用薄一些 At present, just when the agricultural plastic covers the season, the market offers a wide range of plastic sheeting, thin and thick, peasant friends sometimes difficult to choose, what kind of plastic sheeting effect is obvious, cost-effective? Agricultural experts believe that the choice of plastic film should Consider the use of plastic film in the area, climate and other factors. China has a vast territory with a large difference in climate conditions between north and south. The climate in the south is humid and the average temperature is high. It is more advantageous to choose the thinner film and dry climate in the north. In case of sandstorm, it is easy to rupture and perforation. . Crops are not the same at different times. Crops such as corn and vegetables are generally planted around Ching Ming, with a temperature between 4 and 16 degrees Celsius, a large temperature difference between day and night, and sometimes a minimum temperature of up to 0 ℃, so in order to improve the ground temperature, to ensure the growth of seedlings, you should use a little thicker film, and in the summer before and after the planting of crops, you can use a thinner