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Peter
03:18PM, 22 Oct 2009
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Category: Lawns
Expert
03:18PM, 22 Oct 2009
Pina
How much gypsum does one need per square metre? We have approx 40sqm to cover.

We are putting down new lawn and have dug up all the top soil only to find clay beneath it. Have been told that gypsum will break the clay down .. how much do we throw down? Have purchased gypsum - yellowish in colour .. is this gypsum or are there different varieties of gypsum.

Submitted: 07:23PM, 23 Oct 2010
Answer: There may be some slight colour variation in gypsum but basically there is only one type of gypsum, calcium sulphate dihydrate. For best results, we suggest you dig up the clay to a depth of 15 cm, breaking up any large clumps, then spread gypsum at a rate of 1 – 2 kg per square metre. Work into the top of the soil and water in well.
Category: Fertilising
Tags: gypsum
Answered: 04:37PM, 01 Nov 2010

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