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Alfalfa (/ æ l ˈ f æ l f ə /) (Medicago sativa), also called lucerne, is a perennial flowering plant in the legume family Fabaceae. It is cultivated as an important forage crop in many countries around the world. It is used for grazing, hay, and silage, as well as a green manure and cover crop. The name alfalfa is used in North America.
Autotoxicity in alfalfa is produced from the first seeding of the plant. The plant emits a chemical or chemicals into the soil that reduce the effectiveness of further alfalfa seedings. Studies show that the chemical is extractable from fresh alfalfa, is water-soluble, reduces germination, and prevents root growth. [ 7 ]
Typically, there is a two-week "window" during which grass is at its ideal stage for harvesting hay. The time for cutting alfalfa hay is ideally done when plants reach maximum height and are producing flower buds or just beginning to bloom, cutting during or after full bloom results in lower nutritional value of the hay.
The best-known member of the genus is alfalfa (M. sativa), an important forage crop, [4] and the genus name is based on the Latin name for that plant, medica, from Greek: μηδική (πόα) Median (grass). [5] Most members of the genus are low, creeping herbs, resembling clover, but with burs (hence the common name).
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Common leaf spot can be found anywhere that alfalfa is grown, but prefers cool, moist conditions and acidic soils. The ideal temperature for the pathogen is 60-75 degrees Fahrenheit. [6] [7] The first and second harvests of alfalfa are most threatened. Second harvest tends to be the most affected by the disease because the environmental ...