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Gypsum for clay soil
Chris J Dixon wrote:
Ragnar wrote: "Chris J Dixon" wrote in message ... Having just extended a flower bed to incorporate what has been lawn for 40 years, I am left with some pretty solid clay soil. Gypsum is recommended as a soil improver, but appears to be sold in garden centres as a proprietary product costing nearly £5 for 2.5 kg. http://www.capitalgardens.co.uk/clay...er-p-6321.html On the other hand, I can pick up a 25 kg bag of multi-finish plaster for under £5, and AFAIK this is essentially the same material. Any reasons not to go with plaster? I don't really know the answer to your question, but I would warn you not to use gypsum if you want lime-hating plants such as heathers, rhododendrons etc Other sources seem to be of the opinion that one of the benefits of using gypsum is that it is essentially neutral, and will not alter pH. Chris I just checked, and its main constituent, calcium sulphate dihydrate is mildly alkaline. giving a typical PH of about 7.4 If its the raw plaster of paris, its even more alkaline at a ph of 11+ |
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