How would fallowing the land conserve moisture?

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Fallowing land involves plowing, harrowing, and breaking up soil without seeding, primarily to eliminate weeds and conserve soil moisture. The process conserves moisture by preventing plants, including weeds, from extracting water from the soil through transpiration, which is more effective than evaporation alone. Without plant cover, a greater amount of moisture remains in the soil, enhancing its availability for future crops.
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to plow, harrow, and break up (land) without seeding to destroy weeds and conserve soil moisture
[M-W's Col. Dic.]

How would fallowing the land conserve moisture?
 
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Growing plants(weeds in this case) pull moisture out of the soil and transport it to the atmosphere (ref:transpiration). This transports the moisture out of the soil more efficiently than simple evaporation from the soil surface. If there is no plant cover, more of the moisture remains in the soil.
 
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