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 |