在第一组试验田中，她正在比较传统的两年制小麦休耕轮作制和三年轮作制，即首先种植免耕冬小麦，第二季种植免耕冬小麦，然后种植高粱。

In one set of plots, she is comparing the traditional 2-year, wheat-fallow rotation with a 3-year cycle of no-till winter wheat, followed by a second crop of no-till winter wheat, followed by sorghum.

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免耕和传统耕作制相比，土壤中镁的含量没有实质的变化。

Typically, magnesium levels in soils under no tillage do not change materially from those under conventional tillage .

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