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As part of these impacts on agrarian structures, predominant farming systems and cropping patterns changed considerably within only a few years. Besides increased investment in irrigation systems and rice production, a higher share in total agricultural area became devoted to perennial crops due to enhanced tenure security for these cultures (Deininger and Jin 2008). Through a stepwise improvement of tenure security for perennial crops in particular, land cultivated with these two types of cropping changed remarkably during the reform process (Do and Iyer 2008): Plots dedicated to multiyear cropping significantly increased at the expense of annual crops, with the coffee boom in Vietnam being one indicator.