Assertion: forage legume | /r/AtLocation | cultivation
Facets:
value: for as little as 75 years
type: TEMPORAL
Source sentences:
text: Although tropical forage legumes have been grazed in natural habitats for many years, they have only been under cultivation for as little as 75 years, while some like Centrosema pubescens, Lablab purpureus and Pueraria javanica were used as cover crops and green manure at least a century earlier.