One reason is simply to make a cereal crop that can make at least some of its own nitrogen, making the production of the crop less expensive for the farmer, and leaving less chance for nitrogen fertilizer to go off-target.
well, beans are not root crops. They are just like rice which is a cereal so beans is a cereal.........:)
Cereals, coarse grains, oilseeds, legumes, vegetables, fruit, nuts, fiber, and biofuel are a few crop examples.
A legume crop is typically grown to help restore the nitrogen levels.
Ray Drew Copeland has written: 'The evaluation of cereal grains, legumes and selected winter annuals as cover crops for the Willamette Valley' -- subject(s): Cover crops
legumes
Cereal crops are herbaceous plants, not shrubs. They belong to the grass family and are cultivated for their edible seeds, which are commonly used as food. Examples of cereal crops include wheat, rice, corn, and barley.
maize legumes cotton potatoes all row crops
Mixed crops means different vegetables and cereal crops.
Most legumes have symbiotic nitrogen-fixing bacteria in structures called root nodules. For that reason, they play a key role in crop rotation.When a legume plant dies in the field, for example following the harvest, all of its remaining nitrogen is released back into the soil. In the soil, the amino acids are converted to nitrate (NO3−), making the nitrogen available to other plants, thereby serving as fertilizer for future crops.
Because the majority of crops (cereal crops) are wind pollinated.
cereal root crops ligumes industrial crops fiber crops oil crops pasture and silage
The primary cereal crops grown worldwide in order by volume of production:Corn (maize)RiceWheatBarleySorghumMilletOats