_____________________________________________________________________________________________________ *Corresponding author: E-mail: hamidbenyahia2002@yahoo.fr; Annual Research & Review in Biology 20(4): 1-11, 2017; Article no.ARRB.37924 ISSN: 2347-565X, NLM ID: 101632869 Performance of ‘Valencia Late’ Sweet Orange (Citrus sinensis) on Different Rootstocks in the Gharb Region (Northwestern Morocco) Hamid Benyahia 1* , Abdelhak Talha 1 , Anas Fadli 1 , Ouiam Chetto 1 , Fatima Ezahra Omari 1 and Lhou Beniken 1 1 Research Unit of Plant Breeding and Conservation of Phytogenetic Resources, National Institute for Agricultural Research (INRA), Kenitra, Morocco. Authors’ contributions This work was carried out in collaboration between all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/ARRB/2017/37924 Editor(s): (1) George Perry, Dean and Professor of Biology, University of Texas at San Antonio, USA. Reviewers: (1) Sultan Filiz Güçlü, Süleyman Demirel University, Atabey Vocational School, Turkey. (2) Ram Lal Shrestha, Nepal. Complete Peer review History: http://www.sciencedomain.org/review-history/22133 Received 1 st November 2017 Accepted 25 th November 2017 Published 2 nd December 2017 ABSTRACT Production and quality of citrus fruits depend largely on scion/rootstock compatibility. In order to find suitable combinations able to solve productivity problems of citrus at local scale, the performance of ‘Valencia late’ sweet orange (Citrus sinensis) on 14 rootstocks was studied under field conditions in the Gharb region (northwestern Morocco) through a field experiment. Total cumulative yield over five years of production was highest on Citrumelo 4475 (11) and PT B6 Z13 (5) compared to the other rootstocks. In terms of productivity, Citrumelo 4475 (11), Citrus volkameriana (25), Citrus macrophylla (24) and the Sunki mandarin x PT (16) and Sunki mandarin x PT (39) hybrids were the most efficient. Furthermore, this study revealed that the use of some rootstocks improved significantly juice content of Valencia late fruits. These included Citrus volkameriana (25), PT B6 CZ 24 (3), PT B6 CZ 13 (5), Cleopatra mandarin x CC (30), Sunki mandarin x PT (16), Citrumelo 4475 (11) and Citrumelo 1452 (41). Concerning juice quality, the study has identified rootstocks that enhanced both acid and Original Research Article