Prior to 1945, Arizona led the nation in per-acre alfalfa seed yields. This supremacy has been lost to California and Washington. While both acreage and yield per acre have declined in Arizona, the reverse has been the case in California (Table 1).
Butler, George D. Jr.; Todd, Frank E.; and Tuttle, Donald M., "Alfalfa Pollination in Arizona" (1956). Bu. Paper 61.
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