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|