Home' NZ Dairy Farmer : February 2013 Contents 58 The Dairyman FEBRUARY 2013
FOREVER evolving council
requirements and regulations
drives us here at Williams -
to be relentless in product
research & development to ensure
we are providing compliant
equipment that is competitive
with other irrigation equipment
on the market.
The next step forward for trav-
elling irrigators, we feel, was
gaining wider spreading widths to
lower the application rates and
cut down the labour input.
To achieve this, we first
thought building an irrigator with
a wider boom was the best way
forward to achieve this by after
building an 18m fold-up boom
version of the Greenback to try
and get a 50m spread width.
The construction cost, freight-
ing and the farmer having to
move the irrigator was all going
to be against us so we went back
to the drawing board and looked
at other options.
The Williams GB Magnum
uses the proven reliability of a
Williams Greenback and the sim-
plistic performance of a Sime rain
gun to form an irrigator that from
what we can tell is the first of its
kind. In short, the GB Magnum is
a rain gun mounted to a
Greenback with one arm blanked
off. We have managed to more
than double the wetted width of
the Greenback while maintaining
a similar flow, halving our aver-
age application rates and depths.
August 2012 saw the first pro-
totype GB Magnum constructed.
This machine has been in use on
a high input local dairy farm
pumping straight from a concrete
sump for the past four months.
After some fine tuning, the irriga-
tor has been running faultlessly.
Again at Williams, the new
machine has been independently
tested. These tests revealed the
GB Magnum is capable of apply-
ing average application depths of
3mm at application rates below
10mm/hour, which we were tar-
geting. Wetted widths ranged
from 45-90m depending on oper-
ating pressure and nozzle size.
Call us today or visit
www.williamsirrigation for more
Calculate your savings online
FARMERS are regularly faced with tough investment deci-
sions that require robust financial scrutiny, so Precision
Irrigation has created an online VRI savings calculator.
The calculator aims to take some of the guess work out of the
equation when considering variable rate irrigation as an
The calculator is comprehensive and savings accumulate as
the different areas where precision VRI can be of benefit on a
dairy farm are analysed, such as a reduction in cull cows from
lameness due to walking on rough, wet tracks. It works by the
same old adage as most analysis tools - the results are only as
accurate and complete as the information entered. However,
should you get partway through and not have some of the
information required, the session can be saved and revisited
later. Failing that, your local Zimmatic irrigation dealer will
be able to help you out.
Over the past four years of working closely with customers,
Precision Irrigation knows that every farm is different, and so
is the way Precision VRI is used to maximise water usage.
Trials show savings of up to 27 per cent on dairy and cropping
farms are realistically achievable, and these trial results are
repeatedly backed up by farmer feedback. Because of the flex-
ibility of the Precision VRI system, the irrigation plans can be
tailored to meet the exact soil moisture requirements of the
irrigated area, with the ability to avoid watering tracks, drains
and poor land.
Previously reported success stories include Wainono
Dairies in Fairlie where Precision VRI technology has allowed
50L/second of irrigation water to be saved under three centre-
pivots' irrigated areas, which is then redistributed to other
parts of the farm. The savings came from avoiding watering
33ha of ineffective area (tracks, creeks, troughs and swamps)
and differential watering of four distinct soil types. The redis-
tributed water produced an additional 4320kg DM/day, which
when extended over the year equates to 518,400kg DM, a very
favourable result according to part-owner John Wright.
The Precision VRI system for centre pivot and lateral move
irrigators gives total control of where water is applied beneath
an irrigator. With remote programming and monitoring
through easy-to-use software interface and an advanced sys-
tem controlling every sprinkler on the irrigator, water is
applied at varying rates only where necessary. Water and
pumping costs are saved and the irrigator can run to maximum
http://www.precisionirrigation.co.nz/ or visit your local
See us at
CD Field Days
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