ISHS Acta Horticulturae 537: III International Symposium on Irrigation of Horticultural Crops
INFLUENCE OF TWO TRAINING SYSTEMS AND IRRIGATION ON WATER CONSUMPTION OF GRAPEVINES IN THE FIELD |
| Authors: | J. Schmid, H.R. Schultz |
| Keywords: | Vitis vinifera, sap flow, training system, irrigation |
| Abstract:
The influence on water relations of two training systems - Silvoz and minimal pruning - was examined on field grown grapevines (Vitis vinifera L. c.v. White Riesling clone 198 Gm scion), grafted on 5 C Geisenheim clone 6-13 Gm rootstocks. Crops were planted in 1977 at the Research Institute in Geisenheim, Germany (50° North, 8° East). One part of the experimental plot was irrigated by drip irrigation, the other part was without irrigation. Canopy leaf areas from Silvoz-trained vertical shoot positioned vines (VSP) ranged from 3.2 to 5.9 m2, whereas the canopy leaf area from minimal pruned vines ranged from 8.6 to 11.4 m2. Pre-dawn leaf water potential was measured weekly during the growing period. The water consumption of grapevines was measured by a modified Granier system. This method allows a continuous measurement of sap flow through the stem under natural conditions in the field. Measurements were carried out over a 4 month period in 1998. Data obtained from sap flow sensors showed differences in transpiration rates caused by different canopy sizes and varying evaporative demands as a result of changing meteorological conditions. During a period of 130 days the average water use of minimally pruned vines reached 372 litres per plant, while water consumption of VSP-vines was 282 litres per vine. | |
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