One reason alfalfa is rich in nutrients is because its roots extend as much as 30 feet into the soil, reaching stores of plant food and water reserves and allowing it to withstand extreme drought.

• 41紫花苜蓿蕴含丰富营养，其中一个原因是它的根部能伸展深至泥土下30尺的地方去摄取植物的养分和水分，这令紫花苜蓿能够在极乾罕的环境生长。