Samples taken for analyses

7 Aug 2013

I’ve taken samples of each growing medium to send off today.  Each sample is about 2 litres, consisting of about 20 sub-samples.

The following tests will be carried out:

Extraction according to BSEN13040 2000 [1:5]
Includes Dry Matter, Bulk Density, Dry Density, pH, Conductivity, Nitrate-N and Ammonium-N with calculated soluble N, Chloride, Sulphate, Potassium, Phosphorus, Magnesium, Calcium, Sodium, Iron, Manganese, Zinc, Copper and Boron.

A low conductivity is desirable for good germination.  A modest amount of water-soluble Nitrogen makes it easier to control the growth of brassica plants.

13 Aug 2013

The results came back today – there are large ranges for each nutrient e.g.

pH   6.4 – 8.0
Conductivity μS/cm    215 – 727
Total soluble Nitrogen mg/l      16 – 451

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