在四月，他在室内播种。
你可以用播种盘在室内播种，容器的深度要至少可以容纳3厘米高的土壤。
You can use a seed tray to start the seeds indoors. The container should be deep enough to hold at least three centimeters of soil.
通过室内外试验，对秸秆覆盖条件下播种的土壤临界含水率进行了试验研究。
Soil critical moisture for seeding under mulching was studied by indoor and outdoor experiments.
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