Saving Irrigation Water By Accounting
For Windbreaks
Author(s)
T. T. de Vries, T. A. Cochrane & A. Galtier
Abstract
Water for irrigation in the Canterbury region of New Zealand is becoming an
increasingly precious commodity, as it is in many other areas of the world.
Adequate use of this resource will define the economical and environmental
future of the region. Current irrigation systems, even under best management
practices, over-apply water, as they do not account for spatial variability of crop
water needs in fields. Over-application of water is wasteful and has
environmental and economical repercussions. Water requirements are
determined by crop evapotranspiration (ET). Key factors affecting ET in
Canterbury are wind and solar radiation. Both of these are significantly affected
by windbreaks, resulting in variability in ET and water requirements across a
field. Understanding the variability in ET caused by windbreaks will enable for
the correct application of water through precision irrigation systems.
A theoretical model was developed to estimate savings in irrigation by
accounting for windbreaks in the Canterbury region. Windbreaks reduce
evapotranspiration and therefore crops/pasture behind windbreaks needs less
water than those in other parts of the field. Results for a case study in Canterbury
show that windbreaks can potentially reduce the annual on-farm water
consumption by 10 to 20%, while still maintaining ideal crop/pasture yields. In
the short term, the application of precision irrigation systems in fields with
windbreaks can have the farm level benefits of improved water use and reduced
nitrogen/phosphorus leaching. In the long term this could translate directly into
cost savings because of a potential decrease in energy used for irrigation
(running pumps, etc.).
Keywords: irrigation modelling, evapotranspiration, windbreaks, water saving.
Keywords
irrigation modelling, evapotranspiration, windbreaks, water saving
Related Book
Other papers in this volume
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