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Article

Response of Clementine Mandarin to Water-Saving Strategies under Water Scarcity Conditions

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Departement of Horticulture, Institute of Agronomy and Veterinary Medicine Hassan II, Ait Melloul, Agadir 80.150, Morocco
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Applied Geology and Geo-Environmental Laboratory, Faculty of Sciences, Ibn Zohr University, Agadir 80.000, Morocco
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International Water Research Institute (IWRI), Mohamed VI Polytechnic University, Agadir 80.000, Morocco
*
Author to whom correspondence should be addressed.
Water 2020, 12(9), 2439; https://doi.org/10.3390/w12092439
Received: 21 July 2020 / Revised: 19 August 2020 / Accepted: 20 August 2020 / Published: 30 August 2020
(This article belongs to the Section Water Use and Scarcity)
Water scarcity is the most constraining factor for crop production, especially in arid and semi-arid areas of Mediterranean countries such as Morocco. Within these conditions, different water-saving strategies using deficit irrigation (DI) were tested on two six-years old clementine varieties (‘Sidi Aissa’ and ‘Orogrande’). These DI strategies were applied during the second part of fruit growth and during fruit maturation and included: the control treatment (Cntl), in which the trees received 100% of crop evapotranspiration (ETc) for the entire irrigation season; regulated deficit irrigation (RDI), with an application of 75% of ETc (RDI-1); partial rootzone drying (PRD), with an alternating irrigation between the two root system halves for 3–4 (PRD-3/4) and 7 (PRD-7) days, with an application of 50% crop water requirements; and RDI-2, with an application of 50% of crop water needs during fruit maturation. The results indicate that the trees preferably absorb the water from the upper 0–30 cm-depth soil profile and that fruit drop was increased by PRD for ‘Sidi Aissa’, whereas RDI-1 had no effect on this parameter. The DI strategies had no effect on fruit drop for ‘Orogrande’. The PRD reduced fruit size, yield and fruit juice content, with the effect being more pronounced on ‘Sidi Aissa’. The RDI-1 had no effect on fruit yield for ‘Orogrande’ but reduced it for ‘Sidi Aissa’. RDI-2 had no effect on yield, fruit size or fruit juice content. The DIs tested increased water use efficiency and enhanced fruit maturation as a result of increased juice sugar content and reduced acidity. The PRD tends to increase salt accumulation in the rootzone. Overall, ‘Orogrande’ was less sensitive to water stress and was more water-use efficient, and, under the semi-arid conditions of the experimental zone, PRD should not be used on clementine. View Full-Text
Keywords: citrus; deficit irrigation; yield; fruit size; fruit quality; water use efficiency citrus; deficit irrigation; yield; fruit size; fruit quality; water use efficiency
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MDPI and ACS Style

El-Otmani, M.; Chouaibi, A.; Azrof, C.; Bouchaou, L.; Choukr-Allah, R. Response of Clementine Mandarin to Water-Saving Strategies under Water Scarcity Conditions. Water 2020, 12, 2439. https://doi.org/10.3390/w12092439

AMA Style

El-Otmani M, Chouaibi A, Azrof C, Bouchaou L, Choukr-Allah R. Response of Clementine Mandarin to Water-Saving Strategies under Water Scarcity Conditions. Water. 2020; 12(9):2439. https://doi.org/10.3390/w12092439

Chicago/Turabian Style

El-Otmani, Mohamed, Anouar Chouaibi, Charif Azrof, Lhoussaine Bouchaou, and Redouane Choukr-Allah. 2020. "Response of Clementine Mandarin to Water-Saving Strategies under Water Scarcity Conditions" Water 12, no. 9: 2439. https://doi.org/10.3390/w12092439

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