Efficient water management plays an important role in irrigated agricultural systems.
Under conventional irrigation (Uniform Rate Irrigation or URI), parts of
an irrigated paddock are over or under-irrigated due to spatial variability in soil water-holding capacity, infiltration rates and topography. Under-irrigated areas are subject to water stress, resulting in production loss, while over-irrigated areas suffer from poor plant health and nutrient leaching.
Variable Rate Irrigation (VRI) systems are designed to address the need to better achieve
irrigation efficiency, aiming for the best conversion of each millimetre of irrigation water
to plant growth. Irrigation efficiency is commonly referred to as application efficiency and
depends on three main factors:
Application efficiency is the percentage of applied water that is retained in the root zone
(or target area) after an irrigation event. VRI allows for maximum application efficiency
of centre-pivot or lateral-move irrigators. VRI systems achieve this by utilising nozzle and
speed control, soil mapping technology, site-specific soil moisture monitoring, and other
decision support tools.
INZ has produced a Precision Irrigation Resource Book to aid irrigators in their understanding of VRI systems.
Have a read at the e-newsletter that we’ve just sent out: click here.
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June 20 @ 8:30 am - 5:30 pm
Potential and new directors and managers who interact with boards and wish to increase their understanding of the governance environment. A refresh course for existing directors and managers.
August 8 @ 8:30 am - August 9 @ 5:00 pm
Irrigation fundamentals is a 2 day course targeting new entrants to the industry and frontline staff of businesses and organisations that provide services to the irrigation industry. The aim of the 2 days is to give people a comprehensive overview of the….. Read more
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