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晚播小麦覆膜栽培比同期播种的露地栽培具有显著的增产效果,增产的主要原因是覆膜提高了地表和耕层土壤的温度,在一定的晚播条件下,覆膜期增加的积温大体可以补偿由于晚播而减少的积温。根据积温培育小麦苗的原理,晚播覆膜小麦就有可能取得适时播种小麦的产量。为了探讨这个问题,自1987年秋种开始连续2年进行了试验研究,现以1988～1989年度的试验为主将试验结果整理如下:
The main reason of yield increase was that the film mulching increased the temperature of soil and topsoil. Under certain late-sowing condition, the accumulative temperature increased greatly during the film-mulching period It can compensate for the decrease of accumulated temperature due to late sowing. According to the principle of cultivating wheat seedlings by temperature, late-sowing mulched wheat may be able to obtain timely sowing wheat yield. In order to explore this issue, experimental studies have been conducted for two consecutive years since the fall of 1987, and the test results are mainly based on the tests from 1988 to 1989 as follows: