Arjen wrote:
:: There is now a test for sale at eBay to test the level of Active
:: Organic Matter in your soil. The more active OM - the better;
:: excellent for organic farmers and growers, or for your allotment.
:: See:


They're not really of any use for gardeners or farmers - they are primarilly
used by civile engineers and construction companies to find if any organic
matter exists in sand and aggregates prior to using them for concrete
etc...organic matter will eventually disintegrate, thus leaving the concrete
severely weakened...of little importance for a garden path, but immensely
important if your building a motorway bridge or multi-storey office block.