Home' Grower : May 2011 Contents The South Australian Grower -- May 2011
Crop Root Zones
PLANTS take up the lowest energy
water available to them. If the root
zone is viewed as quarters, most of
the water is taken up by the upper portion
of the root zone, typically 40 per cent,
30pc, 20pc and 10pc in descending order
from the surface to the bottom of the root
zone (Figure 1).
SALT will be deposited at a depth in the
soil profile to which the wetting front
penetrates. Short, low-volume irrigation
will tend to cause salt to accumulate in the
upper active root zone.
This can be managed by applying an
occasional longer irrigation that can push
the salt into the lower part of the soil
profile where plant roots are less active.
Ideally periodic, deep irrigation is needed
to leach accumulated salts beyond the root
zone. Increasingly, water allocation is
limiting the opportunity to leach regularly.
In this situation, a key strategy used by
growers is to maintain sufficient quantities
of soil water within the upper active part of
the root zone to meet crop demand.
The plants then do not need to rely on
taking up water from the more saline lower
root zone, unless they become stressed.
Heat wave events become critical periods
to manage onset of stress, as the prolonged
high demand for water can rapidly cause
plants to seek out water from the lower
root zone from where considerable salt can
be taken up.
Maintaining good general crop health is
also extremely important as plants are
more resilient to effects of short term
changes of water supply and salinity.
PART 2 of this series focused on the transport of salts into
and out of the plant root zone. In this article, ANTHONY FOX
and JEANETTE CHAPMAN explore strategies for targeting
Figure 1: FAO standard
uptake of soil water.
Source: ICMS, Rural
Solutions SA (2009)
The HortEx Alliance builds partnerships between
private enterprise, government and grower
associations for skills development in production,
business management and marketing.
South Australian Owned and Operated
Unit 1, Pentland Rd, Salisbury South
12 month warranty on all our products & 5 year structural warranty
Save Save Save
FREE Annexe for Campers
FREE Spare Tyre for Trailers
on all orders this
Wide Range Of:
• Standard Camper Trailers • Full Off-Road Camper Trailers
• Hatd Floor Models • Galvanized 8x5, 7x5 6x4 Trailers
All out Trailers and Campers are built to last. We give a 12 month warranty on
all our products. All of our trailers are Galvanised to prevent against rust
meaning the life of the trailer will be more than double of a non Galvanised
We will give a minimum $200.00 trade in on your old registered
trailer no matter what condition as long as it has current
We have a range of Campers that include Hard Floor and soft top campers
which come standard with a 4 Burner stove and sink with electric pump as
well as a choice (on some models) of standard leaf suspension or
independent suspension. If you would like to try before you buy you can hire
one of our campers for the weekend and if within 7 days of returning, you
decide to purchase a new camper we will take the total cost of the hire off
the purchase of your new Camper.
If you have previously looked at hard floor campers before and wanted one
but thought they were too expensive, come in and look at our range as we
believe in high quality at more than affordable prices.
Our sale is on for this month so come in and get yourself a quality new
trailer or camper and save $$$$$ Now.
AN EAGLE CAN GO ANYWHERE!
CALL THE TEAM NOW
Finance Available (Conditions apply)
Links Archive April 2011 June 2011 Navigation Previous Page Next Page