**Acknowledgements**

This work is supported by: European Investment Funds by FEDER/COMPETE/POCI— Operational Competitiveness and Internationalization Programme, under Project POCI-01-0145- FEDER-006958 and National Funds by FCT—Portuguese Foundation for Science and Technology, under the project UID/AGR/04033/2013" and by fellowship (FCT/SFRH/BD/18441/2004) awarded to Fernandes-Silva, AA. This work was also developed under the activities of project: Water Saving in Agriculture: technological developments for the sustainable management of limited water resources in the Mediterranean area WASA, [ERANETMED/0006/2014] which aims at developing tools for deficit irrigation scheduling in woody crops.

**Author details**

Portugal

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s00271-005-0016-6

Anabela Fernandes-Silva1

\*Address all correspondence to: anaaf@utad.pt

\*, Manuel Oliveira1

Agronomia (ISA), Universidade de Lisboa (ULisboa), Lisboa, Portugal

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