Controlling variability in vineyard with variable rate drip irrigation Author Nadav Netafim, R&D Center, Derech Hashalom 10, Tel Aviv, Israel Vineyards worldwide are spatially variable in canopy size and growth rate, a feature which is exhibited in both low-and high-yielding areas. A variable rate drip irrigation (VRDI) system was developed and operated over 2 years out of a 4-year experiment in a red wine vineyard. During the first year of the experiment, the vineyard was irrigated by the farmer and exhibited high variability in both yield and canopy size. Following 2 years' operation of the VRDI system, both canopy cover and yield were found to be homogeneous across the plot. At the 4th year, the vineyard was irrigated once again by the farmer which resulted in variability patterns similar to the first-year patterns.