<P> A great advantage of crop rotation comes from the interrelationship of nitrogen fixing - crops with nitrogen demanding crops . Legumes , like alfalfa and clover , collect available nitrogen from the soil in nodules on their root structure . When the plant is harvested , the biomass of uncollected roots breaks down , making the stored nitrogen available to future crops . Legumes are also a valued green manure : a crop that collects nutrients and fixes them at soil depths accessible to future crops . </P>
<P> A great advantage of crop rotation comes from the interrelationship of nitrogen fixing - crops with nitrogen demanding crops . Legumes , like alfalfa and clover , collect available nitrogen from the soil in nodules on their root structure . When the plant is harvested , the biomass of uncollected roots breaks down , making the stored nitrogen available to future crops . Legumes are also a valued green manure : a crop that collects nutrients and fixes them at soil depths accessible to future crops . </P>
what crops were discovered that could replenish the nutrients of the soil
what crops were discovered that could replenish the nutrients of the soil
Legumes , like alfalfa and clover
Legumes , like alfalfa and clover