Modifications Induced by Rootstocks on Yield, Vigor and Nutritional Status on Vitis vinifera Cv Syrah under Hyper-Arid Conditions in Northern Chile

Hyper-arid regions are characterized by extreme conditions for growing and lack of water (<100 mm annual rainfall average), where desertification renders human activities almost impossible. In addition to the use irrigation, different viticultural strategies should be taken into account face adverse effects these in which rootstocks may play a crucial role. The research aim was evaluate rootstock on yield, vigor, petiole nutrient content Syrah grapevines under hyper-arid during five seasons compare them ungrafted ones. St. George induced lower yield than 1103 Paulsen. Salt Creek higher plant growth vigor Cu vines Syrah, correlated P content. However, an excess according Ravaz Index. Rootstocks with V. berlandieri genetic background used maintain adequate levels avoid deficiencies or toxicity macro micronutrients.