ISHS Acta Horticulturae 792: V International Symposium on Irrigation of Horticultural Crops
INVESTIGATION OF VINE AND VINEYARD EVAPOTRANSPIRATION UNDER DRIP AND FLOOD IRRIGATION |
| Authors: | J.W. Hornbuckle, E.W. Christen, D. Smith, O. Mounzer, R.D. Faulkner |
| Keywords: | water use, irrigation conversion, Bowen ratio, sap flow, crop coefficient |
| DOI: | 10.17660/ActaHortic.2008.792.40 |
| Abstract:
With both the rapid expansion in wine grape production and a strong industry focus on improving irrigation efficiency, understanding vine water-use has become critically important. Measurements of actual vine water use are required to improve irrigation system performance both in terms of product quality and minimising environmental impacts; however, this is difficult and requires considerable effort to be accurate. This paper presents initial results from sap flow and energy balance studies to determine actual evapotranspiration from a commercial vineyard in the Murrumbidgee irrigation area. Separation of evapotranspiration into transpiration and soil evaporation components was attempted and it was found that, in similarly managed flood and drip irrigated fields, evapotranspiration was considerably higher in flood irrigated fields. However, measured sap flow, which was used to determine vine transpiration, was similar in the drip and flood irrigated vineyards. It appears there is strong potential for reducing soil evaporation and non-vine transpiration to improve water use productivity. This paper presents initial results from field trails undertaken during December of the 2005/2006 irrigation season between full bloom and veraison when the vines were at maximum canopy size. | |
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