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1986年,我们在宝力镇小城子村进行5亩地玉米覆膜栽培试验,平均亩产达918公斤,创我县玉米单产最高纪录。比同等条件相邻裸地玉米增产366公斤,为了搞清玉米覆膜后的增产原因,我们对这块覆膜玉米田进行了调查,结果是:1.覆盖地膜后有增温、保墒作用。据测定,4月28日至5月10日12天中,覆膜田比裸地玉米田累计增加地温(地下5厘米深)18℃。因而加速种子萌发和根系伸延,增强了芽鞘拱土能力,出苗早2天,生育期提前7天。由于薄膜的阻隔作用,土壤水分蒸发大大减少。在干旱天气有保墒作用。如果雨大水多,能加速水分排除,防止过多地渗入土中。2.改善了环境条件,有利于提高光能利用率。由于膜下温度高,地表的热辐射量大,又由于膜面光滑,反光,近地表空气层温度相应提高,所以能增加光合作用。7月4日用仪器测光照强度,地膜玉米为1.9万勒
In 1986, we carried out a 5-mu corn cultivation trial in Xiaochengzi Village, Baoli Town, with an average yield of 918 kilograms, the highest yield of maize in our county. In comparison with the same conditions, the output of corn increased by 366 kg. In order to find out the reasons of yield increase after corn coating, we conducted a survey on the corn covered by plastic film. The results are as follows: 1. It has been determined that in the 12 days from April 28 to May 10, the total area temperature (5 cm below the ground) was increased by 18 ° C in the covered field compared with the bare land. Thus speeding up seed germination and root extension, enhances the capacity of bud sheath arching, as early as 2 days emergence, growth period 7 days in advance. Due to the barrier effect of the membrane, the evaporation of soil moisture is greatly reduced. In dry weather there is a role of soil moisture. If the rain and water, can speed up the water to prevent excessive penetration into the soil. 2. Improve the environmental conditions, help to improve the utilization of solar energy. As the membrane temperature is high, the surface of the large amount of heat radiation, but also because the membrane surface smooth, reflective, near the surface layer of the corresponding increase in air temperature, it can increase photosynthesis. July 4 with the instrument measured light intensity, plastic film corn 1.9 million