Since the 1920s, the alfalfa hay acreage in California has fluctuated between 0.7 and 1.2 million acres (Figure 1) [7]. The acreage is influenced by profitability of alternative crops, the demand for alfalfa hay by the state’s dairy herd, which consumes about 70 percent of the supply, and by water constrains [1, 2, 4].
【How-to】How many gallons in an acre foot of water
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