Originally Posted by Douglas.Curtis
Welcome to ICMag!!
Coco is not what I have the most experience with, but I can help you get the help you're looking for. The more information you can supply us, the more help we can be. So please, what type of lights, wattage, type of hydro system, you're in coco (and posted in the correct forum for it, good job), what type of water you're using, the type of nutrients and way you're mixing them, temps/humidity and CO2 levels. To start with, lol
As water evaporates from the coco, the ppm goes up and the pH drops. Coco also absorbs certain elements and can release them later, under the right conditions. Too high of a nutrient concentration will burn roots and cause root rot (another cause of pH dropping). This is the main reason you want to keep your ppm as low as healthily possible. In my DWC reservoirs I consider 5.3pH to be the bottom end of the 'healthy' range for cannabis. Your pH seems just fine, as evidenced by your remarks on how healthy they look.
Also, there are two common ppm meters @ .5 and .7 conversion. The .5 conversion is a lower number than the .7 for the same EC.
Does this help?
I think I should start a grow journal when I plant new ones in few weeks. I didn't know here are so many people willing to help. I come from Rollitup and people are totally bitches there.
But I'll give you few answers anyway.
I'm using powerful ePapillon lamps that hold Philips double ended bulbs in them which can be dimmed to superlumen mode at 1150W without losing lumen per watt. And of course I'm running my lamps at full power and they are moving on the light rail. Not much, like 40cm. My lux meter reads about 50 000 - 80 000 lumens at canopy and there's 1150W of light per every 1.64 square meter, so 700W per square meter.
18L of coco in every pot
12 plants per one lamp (1150W)
RO filtered water.
- Canna Coco A+B
- little bit of extra Canna mono Ca and Mg, but thinking about changing it to Calmag+, then I would not need to add them seperately.
- Canna PK 13/14
- Canna Boost
The way I'm mixing is in a big cistern with cement mixer, then pumping it through drippers.
Been following some custom feeding schedual so far that was created by one big commercial grow company, but I'm thinking about making my own schedual based on Cannas feeding chart, because I have my own genetics that are unique. I would just like to be able to read the plants accurately. This is why I've started doing the rootzone analysis lately.
I have upgraded my room to be a sealed Co2 setup with AC units and fog makers. Maybe I will need a dehumidifier in the end of flowering, but maybe I could just add some heat and let the AC units cool it down - both together should be quite effective at lowering humidity.
I'm thinking about doing one perfect coco grow before I move on to RDWC system. What I mean by that is that I've been doing mistakes every time and it's 7th grow already. My best results so far have been 1.8 grams per watt and I would like to get it over 2gpw before retiring from coco
the quality was pretty nice btw, although I ran co2 till the end with high temps. I would like to have better quality and higher gpw.
The biggest thing I have learned lately is that I should not let the coco dry out so much. I'm watering more often now
I have been watering one day off one day on, but now I will try make it every day or even 2 times a day. I still have big pots (18L).
Ahh, I should make a grow journal.. This would be more correct place for all that information.