Why do some books recommend a nutrient strength specified in “ECw” or “mMho”?
These terms are often used by European, Canadian and Australian gardeners. ECw stands for Electrical Conductivity of water. The term mMho stands for milliMhos which is the conductance of water between electrodes placed I centimeter apart. The conversion factor to relate ECw to Parts Per Million is: (ECw) x (0.7) x (I 00) TDS (in PPM).
