Long-term effect of dry conditions and drought on fruit trees yield in dryland areas of Tunisia
2008
Ghrab, M.; Gargouri, K., Institut de l'Olivier, Sfax (Tunisia). Laboratoire d'Amélioration de la Productivité de l'Olivier et des Arbres Fruitiers | Ben Mimoun, M., Institut National Agronomique de Tunisie, Tunis (Tunisia)
Research has been developed on tree species and genotypes presenting adaptive mechanisms to drought. Almond and pistachio were considered as very drought tolerant crops. The ability to endure high water deficits was related to efficiency in valorising marginal soils under conditions of high evaporative demand and chronic water shortages. In the arid regions of Tunisia, severe drought threatening the survival of the trees was frequent. Almond and pistachio productivity trees were investigated under limited water supply conditions. The yield of different cultivars was determined for several years as well as climatic data of the orchards. Important yearly fluctuations in rainfall were observed. The result revealed a relationship between these factors and yield. In fact a correlation was found between the amount of rainfall and yield. Thus autumnal rain seems to be an important physiological consideration for water relations in almond and pistachio grown in arid zones. Almond cultivars appeared to be more affected by cyclic severe drought
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