Feb 8, 2023 · Step 4 – Fill three to six 10cm (4”) pots with a 1:1 mixture of the soil, compost or manure with a commercial potting mix containing fertilize, these will be the test pots. To do this, first make a mixture of 50% commercial potting mix and 50% of the soil, compost or manure being tested, mix it together thoroughly, and fill the test pots
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