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Why are alfalfa and clover useful in crop rotation systems?
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Fabales
A flowering stalk of yellow partridge pea (Chamaecrista fasciculata) in the eastern United States.
Alfalfa and clover are highly valued in crop rotation systems primarily due to their ability to improve soil health and fertility through nitrogen fixation.123
These plants, which belong to the Fabaceae family, host symbiotic Rhizobium bacteria within their root nodules. These bacteria convert atmospheric nitrogen into compounds that the plants use for growth; when the plant parts decay, this nitrogen is released into the soil, enriching it for subsequent crops.142
Beyond nitrogen enrichment, these legumes offer several other agricultural benefits:
- Soil Structure: Alfalfa’s deep taproots help decrease soil compaction and improve overall soil quality.2
- Erosion Control: When used as cover crops, they help prevent or reduce soil erosion.12
- Weed Management: Alternating crops changes the growing environment, which facilitates effective weed control.1
- Economic Utility: These plants provide valuable livestock forage, such as hay or silage, or can be plowed under as green manure to further boost soil nutrients.12