Thanks for the great link! I also found this article on "Gardening without digging": http://www.permaculture.co.uk/articles/no-dig-gardening. Instead of ploughing they recommend the use of a garden tine (a tool I have to admit I have never seen in my life before ;-) - this video shows well how it works: http://www.youtube.com/watch?v=Bztfp1Bwr-8&feature=youtu.be