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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:

Week ppm range EC Range Life cycle stage
Week 1 400–600 .8–1.2 Early vegetative
Week 2 600–1000 1.2–2 Late vegetative
Week 3 800–1200 1.6–2.4 Transition
Week 4 800–1200 1.6–2.4 Early flowering
Week 5 800–1200 1.6–2.4 Early flowering
Week 6 1000–1300 2–2.6 Mid flowering
Week 7 1000–1300 2–2.6 Mid flowering
Week 8 1000–1300 2–2.6 Late flowering
Week 9 1000–1300 2–2.6 Late flowering
Week 10 1000–1300 2–2.6 Ripening
  0–400 0–.8 Flush

 

Figure 2—DWC or aeroponics

Week ppm range EC Range Life cycle stage
Week 1 200–400 .4–.8 Early vegetative
Week 2 400–600 .8–1.2 Late vegetative
Week 3 600–800 1.2–1.6 Transition
Week 4 600–800 1.2–1.6 Early flowering
Week 5 600–800 1.2–1.6 Early flowering
Week 6 600–800 1.2–1.6 Mid flowering
Week 7 600–800 1.2–1.6 Mid flowering
Week 8 600–800 1.2–1.6 Late flowering
Week 9 600–800 1.2–1.6 Late flowering
Week 10 600–800 1.2–1.6 Ripening
  0–400 0–.8 Flush

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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