noun
alfalfa; lucerne
Refers to the plant Medicago sativa, commonly known as alfalfa or lucerne.
紫馬肥は家畜の飼料として広く栽培されている。
Alfalfa is widely cultivated as livestock feed.
The name 紫馬肥 literally means 'purple horse fertilizer', likely referring to the plant's use as fodder and its purple flowers. The exact historical derivation is uncertain.