本文试图通过对地膜覆盖玉米产量结构变化等情况的分析,找到其主要增产途径。一、玉米覆盖地膜后的产量结构变化 1986年我们对全省地膜覆盖玉米进行了多次技术考察。从结果来看,覆盖玉米的产量构成因素均有较大幅度的增长,亩穗数比对 This paper tries to find out the main ways to increase yield by analyzing the changes of production and structure of plastic film mulching corn. First, changes in the yield structure of corn covering plastic film In 1986, we conducted a number of technical inspections on the province’s plastic mulching corn. From the results, the yield components of corn cover all have more substantial growth, the number of ears per acre