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

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

Bruno Tisseyre, James A. Taylor, Hernán Ojeda, César Acevedo-Opazo, Serge Guillaume

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.

2011

predawn leaf water potential, soil moisture, spatial variability

10.20870/oeno-one.2011.45.2.1490

OENO One

International Viticulture and Enology Society

Agriculture, Botany