A few facts about PPM, TDS, EC, cF, and pH

1. Electro-Conductivity (EC) or Conductivity Factor (cF) can be
expressed as either milliSiemens (mS), cF, or parts per million (PPM)
1 mS = 10cF = 700ppm.

2. The pH and electro-conductivity values specified here are given as
a broad range. It should be noted that specific plant requirements
will vary according to regional climatic conditions, and from season
to season within that region.

3. As a general rule, plants will have a higher nutrient requirement
during cooler months, and a lower requirement In the hottest months.
Therefore, a stronger nutrient solution should be maintained during
winter, With a weaker solution during summer when plants take up and
transpire more water than nutrients.

4. KNOW YOUR CROP. Plant EC or cF may vary according to the stage of
growth. For example, cucumber prefer 20cF when establishing, and 25cF
after the first harvest. Between 5 and 7 weeks after first harvest,
the optimum cF is 17.

5. The nutrient solution should be discarded at regular intervals.
Should there be a requirement to flush the growing bed, the system
should be flushed with fresh nutrients (run-to-waste) rather than
water to avoid starving or stressing plant.

Hana Combo Meter

Tags: Testing

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