Resumen:
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[EN] Micro-irrigation is considered one of the most efficient water distribution systems and allows increasing
water use efficiency if coupled with effective water-saving irrigation management strategies as regulated
deficit ...[+]
[EN] Micro-irrigation is considered one of the most efficient water distribution systems and allows increasing
water use efficiency if coupled with effective water-saving irrigation management strategies as regulated
deficit irrigation (RDI) or partial root-zone drying (PRD) techniques. However, application of these
strategies makes it crucial the real-time monitoring of soil and crop water status, in order to identify
appropriate irrigation scheduling parameters (irrigation timing and doses) and to prevent irreversible
damage of plant system and/or crop yield reductions.
Even if midday stem water potential (MSWP) is considered one of the most affordable indicator for
direct determinations of crop water status, its measurement requires skilled operators, is destructive and
time consuming, so that indirect and fast estimations are desirable. In this direction, agro-hydrological
models can be considered an easy-to-use tool for indirect evaluations of soil and crop water status aimed
to identify irrigation scheduling parameters even when micro-irrigation distribution systems and water
saving management strategies are adopted.
The paper, after examining the eco-physiological response of citrus orchards to soil water deficit,
assessed the potential of FAO-56 agro-hydrological modelto identify the crop water stress under different
irrigation management strategies.
Experiments carried out during three years (2009–2011) allowed identifying the crop water stress
response to soil water deficit conditions, also confirming the schematization proposed in FAO-56 paper
for citrus orchards. Moreover, after evaluating the similarity between the measured MSWP with the
simulated crop water stress coefficient, Ks, it was proved the fairly good performance of FAO-56 agrohydrological
model to predict soil water content (RMSE = 0.04 m3 m−3), from one side, and the crop
response to different irrigation management strategies, from the other.
The obtained results evidenced that the crop water stress coefficient estimated by the model can be
used as a suitable indicator to replace the tedious and time-consuming field measurements of MSWP.
© 2016 Elsevier B.V. All rights reserved.
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Agradecimientos:
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Research was carried out in the frame of the PRIN 2010 projects, co-financed by Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR) and Universita degli Studi di Palermo. Authors wish to thank the Committee ...[+]
Research was carried out in the frame of the PRIN 2010 projects, co-financed by Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR) and Universita degli Studi di Palermo. Authors wish to thank the Committee for International Relations Office (CORI) of University of Palermo to support the research cooperation with the Polytechnic University of Valencia.
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