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Lofgren said farmers are worried that their work force is about to disappear. They said they want to hire legal workers and U.S. citizens, but that it's nearly impossible, given the relatively low wages and back-breaking work.
Wages can range from minimum wage to more than $20 an hour. But workers often are paid by the piece; the faster they work, the more they make. A steady income lasts only as long as the planting and harvesting seasons, which can be measured in weeks."
Ag Industry Faces Labor Woes in Immigration Debate (http://www.myfoxphoenix.com/dpp/news/immigration/APX-USImmigrationAgriculture-Workers_64703134-06042011 - broken link)
I dont see a probleme with Americans doing the work. Many people I know would be happy to get 10 an hour or more.