Here's what I'm running on my canna week by week.
ML per gallon of each A and B.
PPMs by week
I'm totally new at this but what I've learned is that you should be keeping an eye on what the plant needs. Feeding it too much food will result in build up.
What I'm going to do is feed on Day 1 and measure the run off. Then I water on days 2 and 3 without run off. On Day 4 I water with run off and measure that. This doesn't provide me with accurate information, but it gives me a ratio to work with. Over time I hope that these ratios will give me the ability to discern what is going on in the media.
If the run off of the Day 4 watering is "low" this tells me I should feed the plant a little more. If the run off is still "high" then I can continue to water because the plant is telling me it doesn't need that much nutrition. Since the coco will wash out nutrients pretty easy I want to be careful to get the same amount of run off each time. Getting a bunch of run off, versus just a few ounces, could skew the comparisons.
The watering run off gives me a value. It isn't the actual ppm level but it is a representative, a "shadow." By keeping tabs on how this shadow value moves by consistent testing methods I can infer what is going on with the plant.
For me it is more about consistency than accuracy. More about having a general idea than specific knowledge. I think a lot of people feed, feed, feed... If you're using run off each time that can add up to a much bigger cost of growing at the end of day, litterally washing nutrients down the drain. I think that Feed, water, water, water, Feed, with minimal run off will work out for me so long as I'm very attentive and keep good records.
You should at least be attentive and keep records. Where you go from there is up to you.
Edited by CannabisPants, 28 November 2010 - 07:57 PM.