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Using stockpiled feedlot manure as fertilizer
(Oklahoma Cooperative Extension Service, 2009-10)
Sampling animal manure
(Oklahoma Cooperative Extension Service, 2007-06)
No-till cropping systems in Oklahoma
(Oklahoma Cooperative Extension Service, 2007-08)
Oklahoma agriculture soil test summary 2002-2003
(Oklahoma Cooperative Extension Service, 2004-05)
Oklahoma agricultural soil test summary 2004-2008
(Oklahoma Cooperative Extension Service, 2009-08)
Using lagoon effluent as fertilizer
(Oklahoma Cooperative Extension Service, 2007-06)
Oklahoma agricultural soil test summary 1994-1999
(Oklahoma Cooperative Extension Service, 2002-07)
Fertilizer nutrients in animal manure
(Oklahoma Cooperative Extension Service, 2009-10)