Biology:Permanent vegetative cover
From HandWiki
Permanent vegetative cover refers to trees, perennial bunchgrasses and grasslands, legumes, and shrubs with an expected life span of at least 5 years.
In the United States, permanent cover is required on cropland entered into the Conservation Reserve Program.
References
This article incorporates public domain material from the Congressional Research Service document "Report for Congress: Agriculture: A Glossary of Terms, Programs, and Laws, 2005 Edition" by Jasper Womach.
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