Original research articles

A comment on inter-field spatial extrapolation of vine (Vitis vinifera L.) water status

Abstract

Aim: Recent work has identified strong intra-field relationships of pre-dawn leaf water potential (ΨPD) between paired sites. This study investigates if these relationships exist at the inter-field level when soil types between fields are constant or different in a vineyard in Southern France.

Method and result: Nine fields were sampled for ΨPD on 6 dates over two growing seasons. When general assumptions of uniformity in climate, growing conditions and soil moisture were able to be met, a linear relationship between the mean ΨPD responses of different fields was observed. The relationship was no longer linear when the soil moisture regime between fields differed.

Conclusion: The results indicate that it should be possible to extrapolate a reference ΨPD value across a production region (syndicate/co-operative) defined on a similar soil type.

Significance and impact of study: These intra-field relationships may minimise the need for ΨPD sampling to define irrigation/crop management in areas planted to similar soil types. The poor fit between fields with differing soil moisture regimes indicates that the original intra-field model may be flawed in larger fields or vineyards with heterogeneous soil moisture conditions.

Authors


James A. Taylor

Affiliation : Cornell Lake Erie Research and Extension Laboratory, School of Integrative Plant Science, Cornell University, 6592 West Main St, Portland, NY, 14769, United States; School of Agriculture, Food and Rural Development, The University of Newcastle upon Tyne, Cockle Park Farm, Morpeth, NE61 3EB, United Kingdom

jtesque@yahoo.com

César Acevedo-Opazo

Affiliation : Centro de Investigación y Transferencia en Riego y Agroclimatología (CITRA), Universidad de Talca, 2 Norte 685, Talca, Chile; Facultad de Ciencias Agrarias, Universidad de Talca, 2 Norte 685, Chile


Serge Guillaume

Affiliation : Cemagref, UMR ITAP, F-34196 Montpellier, France


Hernán Ojeda

Affiliation : Unité Expérimentale de Pech-Rouge, INRA, 11430 Gruissan, France


Bruno Tisseyre

Affiliation : UMR ITAP Montpellier SupAgro/Irstea, bat 21, 2 place Pierre Viala, 34060 Montpellier, France

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