ADVANCE FOR SATURDAY AUG. 5 AND THEREAFTER - In a July 5, 2017 photo, James Wagner sits on his John Deere tractor in the rolling hills of his farm near Winnetoon, Neb. He planted in his pasture in 1967 a mixture of grasses native to Nebraska and says they are still going strong 50 years later. (Kelly Schnoor/The Norfolk Daily News via AP)
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