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"CF and pH."
Part One: The basics of Nutrient Control.
pH and Nutrient Strength will change as plants use the nutrients you feed them. The Nutrient solution will eventually become depleted, and your plants will have nothing to continue growing with.
There are two ways to treat this situation.
Empty your tank and fill with fresh nutrient every 7 to 14 days; or
test and adjust your solution and dump every 7 to 28 days.
By adjustment, we can get the best out of the Hydroponic System and the best yield in our crop. This will ensure problem free Hydroponic Gardening.
Nutrient Strength is read in CF
(CF means conductivity factor)
(Conversions 10CF = 1EC = 50 to 70ppm)
Nutrient strength is read using a Conductivity meter. These meters will show nutrient as a measurement of dissolved solids (either conductivity factor, Electro conductivity or parts per million). If conversion is needed, a multiplier of 65 to get parts per million is approximate enough.
By keeping the nutrients at an optimum level, your plants will do much better. The range of nutrient strength is 8 to 30 CF, depending on the plant.
Some guidelines would be:-
8 to 12 will apply to lettuce,
10- 18 for ferns, herbs,
16 to 22 for most vegetables and plants generally,
22 to 30 for Tomatoes or heavy feeding plants.
As a guide, most Indoor Growers use 10 for young plants, until the plant begins to grow faster, then 24 until flowering, and 28 during flowering.
Always feel free to ask us for our recommendation.
Generally plants like it lower during growing, and higher during flower/fruit production
Nutrient Strengths Table (approximate CF by number of millilitres added)
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