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Regulated deficit irrigation effects on physiological parameters, yield, fruit quality and antioxidants of Vaccinium corymbosum plants cv. Brigitta

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Abstract

Highbush blueberries require sufficient water throughout the growing season, especially during fruit development. Regulated deficit irrigation (RDI) has been used in many fruit crops to save water and potentially increase fruit quality without reducing yield. Our aim was to determine the effects of RDI on yield, plant–water relations, and fruit quality at harvest. Three irrigation treatments based on actual evapotranspiration (ETa) were applied: 50, 75 and 100% (control) to six-year-old ‘Brigitta’ highbush blueberries in Colbún, Maule Region, Chile, for seasons 2013–2014 and 2014–2015 and to 26-year-old ‘Brigitta’ plants in South Haven, Michigan, USA, during the 2014 season. Severe water deficit treatment (50% ETa) decreased photosynthetic rate, vegetative growth (second season in Colbún and South Haven’s trial), and fruit quality (berry size, titratable acidity, soluble solids, weight), and increased oxidative stress during both seasons in Colbún. The 50% ETa treatment also had the highest yield reduction during Colbún’s second season. In contrast, mild water stress (75% ETa) resulted in similar fruit yields and quality (firmness, fruit size, titratable acidity, soluble solids and berry weight) but with higher water productivity than the 100% ETa treatment, while it achieved intermediate values for antioxidant capacity compared to the 50% ETa treatment.

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Acknowledgements

The authors would like to thank: Doctorado en Ciencias de Recursos Naturales; CONICYT scholarship 21110856 and 2968/2015; Fulbright and Becas-Chile visiting research scholar grant (2714/2011); Universidad de La Frontera; Universidad de Talca, Research program on Adaptation of Agriculture to Climate Change (PIEI A2C2); CITRA-U. Talca fellowship; Michigan State University; Agrícola Sofama and DeGrandchamps farms.

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Correspondence to Jorge B. Retamales.

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Communicated by D. Intrigliolo.

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Lobos, T.E., Retamales, J.B., Ortega-Farías, S. et al. Regulated deficit irrigation effects on physiological parameters, yield, fruit quality and antioxidants of Vaccinium corymbosum plants cv. Brigitta. Irrig Sci 36, 49–60 (2018). https://doi.org/10.1007/s00271-017-0564-6

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  • DOI: https://doi.org/10.1007/s00271-017-0564-6

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