Abstract:
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[EN] The effects of long-term summer deficitirrigation (RDI) strategies on ‘Navelina’ orange trees (Citrus sinensis
L. Osbeck) were assessed in a drip-irrigated commercial orchard located in Senyera (Valencia, Spain).
Three ...[+]
[EN] The effects of long-term summer deficitirrigation (RDI) strategies on ‘Navelina’ orange trees (Citrus sinensis
L. Osbeck) were assessed in a drip-irrigated commercial orchard located in Senyera (Valencia, Spain).
Three irrigation treatments were applied during five consecutive years (2007–2011): a controltreatment,
without restriction, and two RDI treatments, in which the water reduction was applied during the summer
(initial fruit enlargement phase). During the firstthree seasons,the trees under the controltreatment
received 110% of the theoretically required irrigation dose (ID), and the RDI treatments received 40% and
60% of the full ID during the deficit period. During the last two years of the study, the control treatment
was irrigated at 100% of the ID and the amount of water applied in the RDI treatments was additionally
decreased 20% from the reduced ID of the preceding years. The crop’s response to summer deficit irrigation
was analysed in relation to tree water status, which was assessed by relying on midday stem water
potential (st). The lowest st values were reached, as expected, at the end of the water deficit period
and with the most stressed treatment. These minimum st values ranged between −1.6 MPa in 2008 and
−2.5 MPa in 2010. In most occasions, the trees under RDI treatments showed a fast hydric recovery and
had completely re-hydrated one week after restarting irrigation. Summer RDI treatments did not cause
negative effects on either the amount or on the quality ofthe yield ifthe threshold value of st = −2.0 MPa
was not surpassed. According to the results, it can be concluded that long-term RDI strategies may be
applied successfully on Navelina orange trees during summer without negatively affecting the studied
parameters while allowing water savings between 12% and 27%.
© 2016 Elsevier B.V. All rights reserved.
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Thanks:
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This experiment was funded by the company Tecnicas Valencianas del Agua S.A. (TECVASA), with financial support from the Conselleria de Agricultura, Pesca y Alimentacion de la Generalitat Valenciana for this purpose (DOCV ...[+]
This experiment was funded by the company Tecnicas Valencianas del Agua S.A. (TECVASA), with financial support from the Conselleria de Agricultura, Pesca y Alimentacion de la Generalitat Valenciana for this purpose (DOCV 5493, 19 April 2007, no. exp.: 2007TAHAVAL00018).
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