In terms of electrical conductivity (EC),
all bio-extracts had quite high values of 14.17,
13.52 and 26.60 dS m-1 for Chinese kale, Chinese
cabbage and soybean, respectively. Such high EC
values may be the cause of the organic compounds
found in bio-extracts, such as organic acids,
vitamins, enzymes, hormones and minerals.
Similarly, soybean bio-extracts with a high organic
compound content displayed high EC values.
These results are similar to the report by the
Department of Agriculture (2003).