cover crop 覆盖作物
肥田作物
保护作物
cover crop[ noun ]
crop planted to prevent soil erosion and provide green manure
<noun.plant>
Cover crop \Cov"er crop\
A catch crop planted, esp. in orchards. as a protection to
the soil in winter, as well as for the benefit of the soil
when plowed under in spring.
[Webster 1913 Suppl.]