Implementing partial rootzone drying 2008-02-01T05:13:59Z 2009-07-10T03:12:01Z Implementing partial rootzone drying National Program for Sustainable Irrigation Fact sheet 2005/2 National Program for Sustainable Irrigation National Program for Sustainable Irrigation The partial rootzone drying (PRD) method of irrigation, originally developed for grapevines, is now being used in a range of perennial tree crops in Australia and achieving some exciting results in citrus and pears, as well as grapes. The technique requires that wet and dry rootzones are created simultaneously around each plant. PF050871 PF050871 yes