在陇东旱塬区以露地条播为对照，对秋覆膜、顶凌覆膜、播前覆膜3个覆膜时期的全膜双垄沟播、全膜覆土穴播、全膜微垄沟播3种播种方式进行了试验比较。结果表明，秋覆膜的保墒能力优于顶凌覆膜及播前覆膜，对促进大豆出苗，提高大豆产量作用明显。其中以秋覆膜全膜双垄沟播处理的大豆折合产量最高，为 2 503.5 kg/hm2，较露地条播增产1 322.9 kg/hm2，增产率达112.1%。

In this paper， contrived trials of different film mulching and different mulching time in the East of Gansu， which were ditch sowing in double ridge， Hole sowing covering soil， ditch sowing in micro ridge mulched with plastic films of autumn film mulching， Dingling film mulching and before sowing mulching. The results showed that Autumn film moisture ability was better than Dingling film mulching， which promoted the emergence of soybean and increased the yield of soybean significantly . Among of them， the soybean yield which treated with the ditch sowing in double ridge in autumn was the highest， that was 2 503.5 kg/hm2 and 1 322.9 kg/hm2 higer than drilling production， increasing rate was 112.1%.

S565.1