A special application form of artificial irrigation of vineyards (German: "partial root drying"). The process, also known as "reciprocal irrigation", was developed by the Australian university in Adelaide and the research institute CSIRO from the mid-1990s for the viniculture developed. Based on the fact that a water stress To a limited extent has a positive effect on the quality of the wine, tests have been carried out vines carried out. The root system was divided and half dried out. The half treated in this way then produced the hormone on a larger scale abscisic acid (ABA), which leads to a (desired) reduced growth of the shoots led.
In order to corroborate the test result, large-scale trials were carried out in a vineyard Cabernet Sauvignon by Rows of vines two drip irrigation lines installed, which were used alternately. The other root section of the vines was dried out. The procedure resulted in the yield kept constant and the quality of red wine was improved. A similar form is Regulated Deficit Irrigation , in which the vines are exposed to greater water stress than partial root zone drying. The process is very common in red wine grapes during the crucial phase of fruit development fruit set and veraison applied. The undersupply with water results in smaller and therefore more extract-rich, better quality berries.