Sustained Deficit Irrigation Of Winegrapes In A
Semi-arid Horticultural Region Of Australia
Author(s)
M. Edraki & M. Krstic
Abstract
In the Murray Darling Basin (MDB), the so called \“food bowl” of Australia,
there is an increasing need for agricultural and horticultural management
practices that use water resources more efficiently. In the Sunraysia region of
the MDB, a trial is being conducted on a Shiraz (Vitis vinifera) winegrape to
explore the potential for improvements in water use efficiency (WUE), and the
impacts on deep drainage by using subsurface drip irrigation with sustained
deficit (SD) irrigation treatments. Other objectives include investigating fruit and
wine quality under various water deficit levels. The treatments consist of one
control (100%) and three deficits being 65, 45 and 34% of the control. In the first
irrigation season (2003-2004), irrigations were scheduled on the basis of average
soil matric potential of the control treatments. A higher WUE was observed as a
result of lower water use in SD treatments, however the control and deficit
irrigation treatments in both surface and subsurface irrigations were not
statistically different in yield and quality components. The surface and
subsurface treatments were not significantly different with respect to WUE and
yield components. Strong spatial variation across the experimental site resulted
in the vines of the eastern plots experiencing drier conditions throughout the
irrigation season compared with vines at the western corner of the site. A range
of measures was considered for the second irrigation season to address the
impact and extent of observed spatial variability. These included an
electromagnetic survey accompanied with soil sampling. An array of
piezometers were installed across the site to measure the extent of seepage from
the irrigation supply channel. Irrigation scheduling was changed to average of
soil matric potential in the drier (eastern) portion of the site to prevent exposure
of these soils to extreme stress conditions. The statistical analysis of results has
been modified to include an indicator of the spatial variability as a covariance to
the analysis.
Keywords: deficit irrigation, soil water potential, subsurface irrigation.
Keywords
deficit irrigation, soil water potential, subsurface irrigation.
Related Book
Other papers in this volume
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