New Grower First Grow - Mephisto Sour Crack
- Thread starter Bugga
- Start date
Thanks man
Well, might have just found my problem. Runoff is 7.1, last I measured it was 6.5. Any advice on how to correct?
- Joined
- Feb 14, 2018
- Messages
- 3,110
- Reputation
- 431
- Reaction score
- 10,018
- Points
- 0
- Currently Smoking
- La Buena Hierba Panama Haze
Hmm the best I can think of would be flushing with 6.0ph water until your runoff matches. From what I've read peat is pretty acidic hence the lime if there to help balance ph. This is just a guess from one novice grower to another but you were probably suffering lockout due to a high ph.
Do you have some ph down so that you can flush until you for your target? You could even do a light nute mix so there's still some food in there but I think the problem is high ph.
My First Grow
Me vs. 00 Seeds Automatik Collections 600w Top Fed DTW
That would match up with my issues I've been having. I do have pH down and I can flush. The only question is do I still flush if I just watered/fed today?
- Joined
- Feb 14, 2018
- Messages
- 3,110
- Reputation
- 431
- Reaction score
- 10,018
- Points
- 0
- Currently Smoking
- La Buena Hierba Panama Haze
I would probably flush with like 1/4 or 1/2 strength. They, from my understanding, can't eat right anyway if the ph is way off.
My First Grow
Me vs. 00 Seeds Automatik Collections 600w Top Fed DTW
My First Grow
Me vs. 00 Seeds Automatik Collections 600w Top Fed DTW
Right on, I'm gonna give it a go, thanks man
- Joined
- Apr 24, 2018
- Messages
- 3,225
- Reputation
- 3,286
- Reaction score
- 16,041
- Points
- 0
- Currently Smoking
- A Mephisto buffet of deliciousness like Double Grape, CDLC, 3BOG and so much more!
Yes, I didn't see that you were running in peat only...that could be part of the issue with the N lockout. Medium needs a buffer or the ph will go up and down all the time. Not really sure what the best buffer is for peat, whether a little dolomite lime or something like that. Ph down will temporarily get you back in line, just not sure if it will last. Let me look into that.
Not a big fan of ph low to get run off correct. I never checked run off ever in thirty years of growing.
Not a big fan of ph low to get run off correct. I never checked run off ever in thirty years of growing.
- Joined
- Apr 24, 2018
- Messages
- 3,225
- Reputation
- 3,286
- Reaction score
- 16,041
- Points
- 0
- Currently Smoking
- A Mephisto buffet of deliciousness like Double Grape, CDLC, 3BOG and so much more!
Ok, here is the right info.
One main characteristic of peat is that it's acidic. This means that the pH of untreated peat will usually be between 3 and 4.5, too low for use in hydroponic applications. Peat is generally amended with calcium carbonate (lime) to make its pH go up and remain there but this process can be ineffective if the peat can still decompose very significantly (if you buy peat with decomposition < H7). This also contributes high amounts of Ca into the media which might lead to nutritional problems if Ca is also applied normally in solution. To alleviate these issues peat is also sometimes treated with lime/dolomite mixtures so that the counter-ions are both Mg and Ca. Alternatively - but more expensively - this problem can be solved by using phosphate buffer solutions that are run through the peat for a significant period of time. A potassium monobasic/dibasic phosphate buffer at a pH of 6.5 with a 100 mM concentration can buffer the peat moss. For this the buffer needs to be applied until the run-off pH out of the peat comes out unchanged. Then tap water should be applied to remove the K/P from the media. Note that this will only work for black peat that's already gone through most of the decomposition process as lighter peats will simply decompose further and acidify the media again.
One main characteristic of peat is that it's acidic. This means that the pH of untreated peat will usually be between 3 and 4.5, too low for use in hydroponic applications. Peat is generally amended with calcium carbonate (lime) to make its pH go up and remain there but this process can be ineffective if the peat can still decompose very significantly (if you buy peat with decomposition < H7). This also contributes high amounts of Ca into the media which might lead to nutritional problems if Ca is also applied normally in solution. To alleviate these issues peat is also sometimes treated with lime/dolomite mixtures so that the counter-ions are both Mg and Ca. Alternatively - but more expensively - this problem can be solved by using phosphate buffer solutions that are run through the peat for a significant period of time. A potassium monobasic/dibasic phosphate buffer at a pH of 6.5 with a 100 mM concentration can buffer the peat moss. For this the buffer needs to be applied until the run-off pH out of the peat comes out unchanged. Then tap water should be applied to remove the K/P from the media. Note that this will only work for black peat that's already gone through most of the decomposition process as lighter peats will simply decompose further and acidify the media again.
- Joined
- Apr 24, 2018
- Messages
- 3,225
- Reputation
- 3,286
- Reaction score
- 16,041
- Points
- 0
- Currently Smoking
- A Mephisto buffet of deliciousness like Double Grape, CDLC, 3BOG and so much more!
You can see how ph down when th ph of the medium is already very low, would be counterproductive.
Similar threads
