Home' Grower : May 2011 Contents The South Australian Grower -- May 2011
ONCE the nutrients are taken up by the
root zone, salinity will fall back to the
levels associated with the irrigation water
quality and management.
Drainage also leads to concentration of
salt within the passing water front.
Since the most volume of water passes
through the upper root zone layers
continual leaching occurs, even during
routine irrigation (Figure 3).
By the time the draining water reaches
the lower root zone, however, a smaller
volume of water is transporting a higher
amount of salt.
The salt will be deposited as the water
front slows and stops.
Therefore, it is important to know how
deep water is penetrating following
irrigation, and the depth to which the crop
is taking up water between irrigations.
Leaching irrigation will be needed when
excessive salt accumulates in the soil from
where the crop is actively taking up water.
LEACHING is a dynamic process closely
linked to water movement. If either
irrigation depth or water salinity, or crop
water use varies, this can lead to rapid
changes in root zone salinity. Temporary
changes between irrigations are normal
and tolerable. However, continued
irrigation to a depth within the active root
zone, or adding fertilisers can lead to
excessive salinity and loss of yield potential.
Leaching strategies and monitoring are
outlined in next month's article.
• Anthony Fox is senior land management adviser,
Adelaide and Mount Lofty Ranges, NRMB, and
Jeanette Chapman is compliance officer for the
Environment Proection Agency.
• Details: 08 8523 7718 or
Next month: Targeting salinity management within
crop root zones
Figure 3: Salt accumulation during
leaching. Graphic: ICMS (2009)
Ideal bulk produce choice
THE AIM Forward Bin Tipper is the ideal choice for transferring bulk produce
or product from a wide variety of different sizes of timber or plastic bins. It
has a capacity of 1 tonne and is robustly- constructed for years of service in
the most demanding of production environments. The tipper quickly and
easily mounts on any standard forklift. Simply slide the attachment onto the
tynes, insert rear lock bins and connect auxiliary hoses. No rotating bars or
rails are required on bins, allowing for standard bins to be used throughout all operations. The tipping
operation is smooth and fully controllable, allowing excellent visibility and a better regulated tipping area.
It is also gentler on the bins and produce than sideways rotating systems. AIM Tippers can easily handle
stacked bins, allows for bins to be picked from stacks and re-stacked tightly side-by-side.
Details: 02 6964 4688, email@example.com or www.aimsales.com.au
CUSTOM Cartons is a 100 per cent family-owned private company
established in 1984 to service the growing demand for small run cartons in
South Australia. But the company's ability to create packaging solutions
resulted in its rapid growth and by 1994, Custom Cartons was a well-
established provider of corrugated and packaging products. Since that time, Custom Cartons has confidently
grown to meet all the packaging and carton needs of a wide variety of clients within Australia and overseas.
Custom Cartons has always maintained a commitment to using the latest technology to improve its product.
Details: Custom Cartons Pty Ltd 08 8348 2999, firstname.lastname@example.org or
Innovation, quality management
WITHCOTT Seedlings was established in 1983 on a foundation of high-quality
seedlings and great customer service. With two nursery sites, the company
grows a large variety of vegetable and plant seedlings and has the proven
capacity to produce well over 500 million seedlings a year. The company is
renowned for its quality management systems, environmental water recycling
infrastructure and inventive horticultural techniques. Withcott Seedlings has
led the market with innovations: particularly focusing on grafted tomato and watermelon which are working
to increase crop yields while limiting the impact of disease. Plant quarantine and nursery hygiene are
extremely vital to the company's success and are the driving forces to much of the production processes.
Stringent crop management protocols are used to minimise the risk of disease. The company uses a variety
of programs and initiatives as part of an integrated pest management program.
Details: withcottseedlings.com.au or contact Richard Tuttleby 0429 497 308.
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