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I recently purchased the Cali pro 2 part nutrient kick starter box which are the best nutrients I’ve ever used. I was just wondering what the EC and ppm readings should be during the vegetative state and flowering state?

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Dear Jay,

Thanks for the great question.

Many growers, like yourself, use Emerald Harvest nutrients because it’s so easy to tailor feedings for success in your garden. We recommend that you base your nutrient application on our accurate, easy-to-read feeding charts. Remember that application rates may vary depending on the water condition and what type of growing medium (for example, soil, coco, peat moss, clay pellets, DWC, aeroponics, etc.) you use. In addition, the plant species, size and age should be considered when dialing in the optimal application rates for your crop.

Then you can determine whether or not you need to tweak the application rates on the feeding chart by measuring the ppm of the nutrient solution. Please look at the two tables below. In Figure 1, you can see the recommended safe ppm for all growing mediums except DWC (deep water culture) and aeroponics, while Figure 2 shows the recommended ppm for DWC and aeroponics.

Figure 1—all growing media except DWC/aeroponics:

Weekppm rangeEC RangeLife cycle stage
Week 1400–600.8–1.2Early vegetative
Week 2600–10001.2–2Late vegetative
Week 3800–12001.6–2.4Transition
Week 4800–12001.6–2.4Early flowering
Week 5800–12001.6–2.4Early flowering
Week 61000–13002–2.6Mid flowering
Week 71000–13002–2.6Mid flowering
Week 81000–13002–2.6Late flowering
Week 91000–13002–2.6Late flowering
Week 101000–13002–2.6Ripening
 0–4000–.8Flush

 

Figure 2—DWC or aeroponics

Weekppm rangeEC RangeLife cycle stage
Week 1200–400.4–.8Early vegetative
Week 2400–600.8–1.2Late vegetative
Week 3600–8001.2–1.6Transition
Week 4600–8001.2–1.6Early flowering
Week 5600–8001.2–1.6Early flowering
Week 6600–8001.2–1.6Mid flowering
Week 7600–8001.2–1.6Mid flowering
Week 8600–8001.2–1.6Late flowering
Week 9600–8001.2–1.6Late flowering
Week 10600–8001.2–1.6Ripening
 0–4000–.8Flush

The nutrient charge of the nutrient solution should be measured correctly before applying nutrients to the selected growing medium. A second measurement should be taken from the nutrient run-off after it has been applied to the growing medium in order to assess the correct ppm (or, if you measure electroconductivity, the EC) range.

If you have any other questions, please let us know! We’re here to help.

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