Editing Green manure (section)

==History==
Green manures have been used since ancient times. Farmers could only use organic fertilizers before the invention of chemical nitrogen fertilizer.  There is evidence for the Greeks plowing broad beans and faba beans into the soil around 300 B.C. The Romans also used green manures like faba beans and lupines to make their soil more fertile.<ref name="Fageria-2007" /> Chinese agricultural texts dating back hundreds of years refer to the importance of grasses and weeds in providing nutrients for farm soil. It was also known to early North American colonists arriving from Europe. Common colonial green manure crops were rye, buckwheat and oats.<ref name="Lawrence 1980 145"/> 

Traditionally, the incorporation of green manure into the soil is known as the [[fallow]] cycle of [[crop rotation]], which was used to allow the soil to regain its fertility after the harvest.{{Citation needed|date=February 2021}}