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Animal manure and soil quality
(Oklahoma State University. Division of Agricultural Sciences and Natural Resources. Cooperative Extension Service, 1998)
Animal manure can raise soil pH
(Oklahoma State University. Division of Agricultural Sciences and Natural Resources. Cooperative Extension Service, 1998)
How phosphorus addition and removal affecting soil test P index
(Oklahoma State University. Division of Agricultural Sciences and Natural Resources. Cooperative Extension Service, 1998)
Quick nitrate test for hybrid sudangrass and pearlmillet hays
(Oklahoma State University. Division of Agricultural Sciences and Natural Resources. Cooperative Extension Service, 1999)