Technical and economic causes of productivity changes in U.S. wheat production, 1949-76
Dept. of Agriculture, Science and Education Administration : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1979 - Wheat - 102 pages
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4cre Agricultural annual applied fertilizer applied N areas average bushels per acre changes check variety climate coefficient of variation continuous cropping continuous wheat costs CRD 1-N CRD's cropping sequences declined decreased drier Durum wheat economic export factors farm farmers Hard Red Spring Hard Red Winter harvested acre harvested acreage herbicides HRW wheat impact increased wheat yields irrigated wheat yields Kansas million acres Montana Nebraska nitrogen North Dakota Northwest percent percentage period pesticides pounds of applied precipitation prices received programs rates of applied relative response to applied rotation saline seeps seeding southern Great Plains standard deviation summer fallow Texas tion U.S. wheat production U.S. wheat yield USDA-ESCS data varietal productivity weed control western wheat acreage wheat after summer wheat class wheat grown wheat prices WHEAT REGION wheat varieties wheat yield trend wheat-fallow wheat-growing regions Winter wheat yield increases yield levels yield response yield variability