Wondering about hiking up my PPM

[Mrdutchmaster]

Both white widow fem from nirvana, 3 weeks along and i use a organic soil, please don't ask specifics about soil. Both have been on 19-8-13 at 300 PPM per gallon and looking at them it looks like i need to bump up my PPM just don't wont any burn.

 

[jaybray]

If you do you wont just want to spike it a couple hundred ppm. start slow and read the plant. If you burn them it will hurt them more than feeding lightly.

 

[Cannabis.Is.Free]

Looks like PH issues to me dude.
I don't understand what you're saying though.

You want to raise PPM levels to FIX a problem? Doesn't make sense.
Your plant looks healthy, but also looks like its suffering from something.
Once you figure that out, you can start with raising the PPM.

 

[Mrdutchmaster]

PH is at 6.5 in both pots. Yes they are both healthly and doing good. Just wondering when to increase and by how much I've fed the twice at 300PPM.

 

[Cannabis.Is.Free]

You might want to check run off water for the real PH, maybe I'm seeing things.
It might be the strain or something, but those leaves look like they are suffering from a PH issue.

So with the PPM at 300 that is fine, I do it like this.

Week 1: Tap water (30-75 PPM)
Week 2: Root nutrients (50-125 PPM)
Week 3: Plant food (150-250 PPM)
Week 4: Anything left (250-500PPM)
Week 5: No burned tips? Up PPM by 100)
Week 6: No burned tips? Up PPM by another 50-100)

Normally people switch to flower by now, and you just start over at week 2 PPM levels for flowering nutrients (Like Rhino Skin, Bloom Booster, Big Bud, anything for flower)
and start working your way up every week.

The max PPM you want, is when your plant has tip burn. Normally that is 700-800PPM (Depending on nutrients used) never go above 1000PPM unless you are a master grower.

 

[kryptoniteglo]

I follow this rule of thumb:

Nothing but water first 2.5-3 weeks.
When they turn 3 weeks old, they get 300ppm.
4 weeks old, 400ppm.
5 weeks old, 500ppm.
6 weeks old, 600ppm
7 weeks old, 700 ppm
8 weeks old, 800 ppm.
Hold for most of flowering, but back off to 600 when there's about 3 weeks to go.

 

[Mrdutchmaster]

I follow this rule of thumb:

Nothing but water first 2.5-3 weeks.
When they turn 3 weeks old, they get 300ppm.
4 weeks old, 400ppm.
5 weeks old, 500ppm.
6 weeks old, 600ppm
7 weeks old, 700 ppm
8 weeks old, 800 ppm.
Hold for most of flowering, but back off to 600 when there's about 3 weeks to go.

Ok that's what i was looking for, i will check the PH runoff but i've been using a soil PH meter and they stay between 6.2-6.6. They are White Widow Fem from nirvana and and are very fat but so short. The tallest one is only 4 inches and I've had to do some LST so the inside get's plenty of light. Yes im usings full spectrum CFL under 24/7. I will be changing to a 18/6 for at least 2 weeks before i get my mh400 and tent to flower them.

Any thoughts or comments would helpful

 

[Cannabis.Is.Free]

I have a few comments.

Why change the light schedule when switching from CFL to MH?
Are you saving on the electric bill, or do you assume 18/6 will have a better impact when using a MH than 24/7 has on a CFL?

I would keep the 24/7 light cycle, switch to MH, check RUN OFF PH (Not PH in soil) and stop using nutrients for at least a week to see if any improvement in growth.

 

[Mrdutchmaster]

ok i just watered and i checked the runoff in both pots and they are 6.3 and 6.4 using a digital PH600 meter. I really think I just need to up my PPM on next feeding.

 

[Cannabis.Is.Free]

Possibly, then again it could just be that pheno of the strain, not all plants look alike.
I guess the only thing you have to worry about at this point is overfeeding.

 

[Mrdutchmaster]

Possibly, then again it could just be that pheno of the strain, not all plants look alike.
I guess the only thing you have to worry about at this point is overfeeding.

Yea that's what i wanted to understand better, I just didn't want to up my PPM to much to soon. But thanks about how to properly check the PH. Guess I can sell my soil PH meter on ebay.

 

[Squidbilly]

I grow in perlite but I have my seedlings on 275-300ppm after week one. Now I'm not in soil so the perlite has nothing in it, but i would assume you can up the ppm. Just do it slowly and see what happens.

If the yellowing is from lack of nitrogen they should improve and gain some color back after the first increase in ppm. I've had similar problems and was hesitant to increase. Started checking my ph like a mad man, double checking, triple checking. I thought it was too early to give my plants a higher ppm. As soon as I couldnt' take it any longer I upped their ppm and they thanked me for it.

Every strain is different. Try to start a thread asking other people who grew the same strain. This has really helped me when growing new strains. Someone who grew it out can at least give you an idea of what worked well for them. I don't think 300 at 3 weeks is all that high.