western-queensland-gardening-guide.pdf - South West NRM

Mulching: For mulching to be effective, the mulch must be maintained and
periodically topped up. For large areas, though, it requires much physical effort
and vast amounts of material (plastic sheeting is not recommended). Remember to
leave a small space behveen the trunk of the tree and the mulch to avoid collar rot
or other fungal damage.
Knockdown herbicides: Knockdown herbicides will kill developed weeds, but
have to be reapplied as needed. As a general rule, the spray should not fall on any
part of the tree - effective guards can be made from buckets or drums. Herbicides
such as glyphosate can be used so long as the tree is protected. (Remember to seek
advice and follo~u the directions on the label.)
Residual herbicides: Residual herbicides applied to bare soil prevent weeds from
developing, and so are suitable for long-term maintenance of the site. But it is
important to use the right herbicide in the amounts appropriate for each species.
(Remember to seek specijic advice and follow the directions on the label.) Knockdown
and residual herbicides, used alone or in combination with one another, provide
effective fast control over large areas.
4. Maintain the general area
There are several ways to maintain the general area:
Slashing: Slashing is a simple way of maintaining the site and it also contributes
to fire control.
Cultivating: The inter-rows can be cultivated provided the tree's roots are not
damaged, and no soil-wash problems are created.
Treating with herbicides: Some specific weed problems can be treated with
herbicides.
Grazing: Once the trees have reached a height of from 2 m to 3 m, grazing can be
useful. Remember, though that some animals - particularly cattle - can do serious
damage to trees by trampling or rubbing against them, or by browsing.
Mulching
Mulching is the practice of pu g a layer of material over the soil surrounding a
tree. The mulch can insulate the soil from temperature extremes, help the soil retain
moisture and suppress the growth of weeds. If organic material is used, the mulch
will break down and contribute organic matter to the soil. Effective material for
mulch is sometimes available from by-products of other farrning activities. The
labour and material costs of mulching need to be balanced against the benefits. The
following points should help in making a cost effective choice of whether to mulch
and if so, what type to use.