[permaculture-oceania] Would a thick mulch kill grass?

[Mike Morris]

On 21/08/06, Paul Darrington <paul.darrington at optusnet.com> wrote:

> I've got about 3 acres of grass to kill, progressivley, & am wondering how
> thick mulch would have to be before grass will not grow through it.

I would guess that, in part, it depends on the variety of grass(es)...
 I have been almost-totally unsuccessful at killing off Kikuyu grass
with a thick (30-40cm) mulch of wood shavings (could not source enough
cardboard for the area in question, but, based on experience, I'm sure
it would have only delayed the regrowth of the grass).

> For our own block, we want to kill the grass (glyphosphate), mow & till (if
> need be), and then sow with a lucerne / chicory / clover mix.
> This is intended to form a living, N fixing ground cover in which we can
> then plant our trees into.

Would love to hear of alternatives to this, as I am faces with approx
1acre of the same problem, and really, /really/ don't want to resort
to roundup, but digging grass out by hand will take me too many years.

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