ISHS Acta Horticulturae 792: V International Symposium on Irrigation of Horticultural Crops
MEASUREMENT AND MODELLING THE TRANSPIRATION OF FRUIT TREES AND GRAPEVINES FOR IRRIGATION SCHEDULING |
| Author: | S.R. Green |
| Keywords: | heat-pulse measurement, sap flow, lysimetry, time domain reflectometry, water stress |
| Abstract:
The goal of sustainable irrigation is to use water parsimoniously and wisely. This means identifying how much water plants are using, and deciding 'when' and 'how much' irrigation is needed to meet their water demands. Water-stress can affect productivity once the soil dries below a given matric potential. Identifying this 'stress point' will help managers to use their water wisely. A series of field experiments, with modelling at the leaf, whole-plant and vineyard scale, are used here to quantify transpiration losses from grapevines. Lysimeter data are used to examine the vines' response to soil drying. New data are presented to illustrate that direct measurement of sap flow and the use of computer modelling are complementary tools to quantify the degree and timing of water stress. | |
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