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

James A. Taylor, César Acevedo-Opazo, Serge Guillaume, Hernán Ojeda, Bruno Tisseyre
2011 OENO One  
<p style="text-align: justify;"><strong>Aim</strong>: Recent work has identified strong intra-field relationships of predawn leaf water potential (<strong>Ψ</strong><sub>PD</sub>) 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.</p><p style="text-align: justify;"><strong>Method and result</strong>: Nine fields were sampled for
more » ... </strong><sub>PD</sub> 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 <strong>Ψ</strong><sub>PD</sub> responses of different fields was observed. The relationship was no longer linear when the soil moisture regime between fields differed.</p><p style="text-align: justify;"><strong>Conclusion</strong>: The results indicate that it should be possible to extrapolate a reference <strong>Ψ</strong><sub>PD</sub> value across a production region (syndicate/co-operative) defined on a similar soil type.</p><p style="text-align: justify;"><strong>Significance and impact of study</strong>: These intra-field relationships may minimise the need for <strong>Ψ</strong><sub>PD</sub> 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.</p>
doi:10.20870/oeno-one.2011.45.2.1490 fatcat:udqwhaqbvvfvnhuaa45wtah6wa