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Agricultural alfalfa ammonia ammonifying amount areas assimilation average avian B.Hol bacilli bacteria barley Bottineau County bushels casein cent clay loam clover color corn cows cultivation culture DeKol dextrose diaphoresis Dickey County Dickinson disease Durum Edgeley energy material Experiment Station extract Fargo farm farmers feed fertility flax flour fungi Gastrophilus grades grams green manure grown growth Hettinger Hoi PB Hoi horse inches increase injection land larvae lesions manure medium megatherium microorganisms milling moisture Native Native Native nitrate nitrification nitrogen North Dakota number of bacteria nutrients oats organic matter PB Hoi PB percent phosphates plant food plots plowed pots pounds present produced rainfall reaction root rotation samples sand sandy loam seed silt loam silty clay soil straw subsoil Substation Superintendent Table temperature texture tillage tomatoes tuberculosis varieties weight wheat-sick Williston yield