Responses of Vitis vinifera L. cv. Sultanina to water deficits during various pre- and post-harvest phases under semi-arid conditions

afrique du sud agotamiento del agua bourgeon brotes buds control de plagas (postcosecha) etapas de desarrollo de la planta growth rate plant developmental stages poda postharvest control pousse preharvest treatment pruning semiarid zones shoots south africa taille tarissement taux de croissance tratamiento precosecha vitis water depletion yema (planta)