The following article shows how the collapse in building in Spain has lead to Spanish workers to try an take back manual jobs from immigrants. This is not quite the back-to-the-farm scenario where manual labour replaces mechanical labour, but it is an interesting step along that line.
http://news.bbc.co.uk/2/hi/europe/7883605.stm
$this->bbcode_second_pass_quote('', 'B')ut, as Spain officially enters recession, Andres is one of a growing number of Spaniards who have been forced to join them on the land.
"It's seven years since I worked the fields," he says, "and I think we'll see a lot more Spaniards returning. In construction, I was earning twice what I make here - but building has simply stopped, there are no jobs. At least here, I'm guaranteed seven or eight months work."
Others see the same logic. In Huelva's heaving job centre, applicants queue to register for an agricultural employment scheme run by Andalucia's regional government. The chosen recruits will pick strawberries, oranges, onions and asparagus. Well over 80% of applicants are Spaniards.
Their eagerness to take what some regard as a backward step is easily explained.



