PPM for the general hydro grow.

Kieahtoka

Hey guys, you've probably seen my dwc grow, but I need some help with ppm. I have absolutely no clue what a safe ppm for a mature clone, with full nutrient levels should be. I use the General Hydroponics 3 part flora series, any help?

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videoman

I dont use GH, however, you pose a tough question. different strains have different needs and tolerance levels.

Here is what i would believe may be a good guidline. it is on the hot side in my opinion but I like to pound my plants to the max unfortiunately that has caused me some issues.

seedlings and clones about 400-600ppm

early veg 600-800

Late veg / full flowering 1000-2000 (be damn careful here! hehe)

A good way to get some baselines is to mix your nutrients per the recommendation of the manufacturer and measure it well and accurately. this will give you your PPM at differing strengths and formulations.

PPM is a rotten terrible way to measure nute strenth, there are 3 diiferent conversion factors out there to convert EC into PPM. .5 .64 and .7 this is bad news to be honest. I use .5 to give me the highest PPM reading so I mix lower strength in theory anyway.

To dial in a DWC you do this. mix a batch as recommended and measure the PPM or EC, the next day at the same time re check the solution.

If PPM has risen you are too hot, if it is lower than you are too weak.

Top off reservoir and check PPM again, if in the same general range as the initial just let er go until you see the PPM has dropped by 25% and then re add the full strength nutrient solution to top off. drain and refill every two weeks. DO NOT over monitor and adjust! there is a fine balance of needed and excessive nutrients.

Plants take up approximateluy 75% water vs. nutrients.

I have had some landrace strains that got bad at 600 PPm in full maturity and some plants I have run to 3000 PPM with no issues at all.

Kieahtoka

alright thanks, my three plants are in full veg, last night the ppm was 1380. I'm going to check it again to see if it went up or down. If the ppm is going up that means the plant is using more water than nutrients right?

__________________
NLXWW
http://www.greenpassion.org/showthread.php?t=106

Kieahtoka & SHAMAN's Underwater Adventure
http://www.greenpassion.org/showthread.php?t=1373

My Creation.
http://www.greenpassion.org/f24/my-creations-4909/

*GreenPassion*

Correct, top off with just water than.

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Kieahtoka

alright well it went from 1385 to 1530 in one night... that's real odd.. but I have been adding PH solution, could that mess up the ppm?

__________________
NLXWW
http://www.greenpassion.org/showthread.php?t=106

Kieahtoka & SHAMAN's Underwater Adventure
http://www.greenpassion.org/showthread.php?t=1373

My Creation.
http://www.greenpassion.org/f24/my-creations-4909/

*GreenPassion*

Try adding more water my friend.

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Ex-owner
Retired

BloodShotI'z

Anything thats added to your water will make your ppm rise. You got good ranges to shoot for from, Vid.

But like in all things...nothing is written in stone. Some strains will need alot more than others. They eyeball is the best judge.

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videoman

It's best to go on the lighter side, in the beginning, you can always add more.
Peace

btdt

GH Flora Series rec's these ppm's at these growth stages

Clones 200-400
Week 1 400-800
Week 2 800-1000
Week 3 1000-1400
Weeks 4-8 1000-1400

Kieahtoka

oh damn.. I'm WAY too high then, probably why I am having a slight burn issue.

__________________
NLXWW
http://www.greenpassion.org/showthread.php?t=106

Kieahtoka & SHAMAN's Underwater Adventure
http://www.greenpassion.org/showthread.php?t=1373

My Creation.
http://www.greenpassion.org/f24/my-creations-4909/