sdavis29

got a question:
i have done an incredible amout of research both on this web site, and also with the help of a couple of books and a video.
all the top growers on this site suggest ph in the high 5 range.
however both the books and the video are animate that ph should be 6.3.
i tend to lean towards this site because so many say the same thing...
just wondering why the difference....

btw..since i stared this project in nov, i have had 4 succesful harvests...and i am shortly looking at numbers 5 and 6...
i was using the 6.3 ph deal...but after rereading this thread i have changed to the recommended ph levels presented here.
i am finally getting the ph drift...5-5-6.0 almost daily..
since my 4 prior grows came out pretty good...i imagine that the next ones should be better using these guidlines...

thx again...

airedog

So if even after flushing my plants start requiring regular large infusions of pH up, is it a sign that they are burning through their phosphorous supply?

Now that I am about 30 days into flowering their rate of lowering the pH of the res is almost twice what it was a few weeks ago. I am using the basic 3 part Advanced Nutrients formula with added Barricade, Big Bud and B1 supplement. I run between 1000 and 1150 ppm and try to keep the pH above 6.0, and below 6.3. I can adjust to 6.1 in a 100L res and be back to 5.4 within 10 hours. Other times the solution will stay stable for a few days, requiring only water top ups (about 10L/day) in a 6 bucket drip system.

The pictures I have posted:

http://pictures.marijuana.com/galler...d=180&uuid=282

have not generated any 'this looks like ........ problem, to fix try ....". There was an insect problem earlier but it seems to be relatively minor since the last spraying with EndAll about 10 days ago.

All the searches have turned up isolated cases of this 'reverse' pH swing; all with no definitive solutions. Does the phosphorus idea make sense?

Airedog

HyDroHawg

It'd be awesome to get some pictures identifying the various stages, and symptoms of these deficiencies... Anyone w/ any pics?

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HyDroHawg

Here's a pic I dug up from a previous soil grow. It's by-far a severe, extreme case... I'd say, mid-way through flowering. This got this bad because I wasn't maintaining correct pH levels during my watering... ...Live & Learn!

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BudPapa

I realize that I'm way late jumping in here.I also realize that it may already have been pointed out and I missed it.The low ph is needed for Manganese.It kicks in when you get down around 5.5.It's good to drop the ph down to 5.5 or so and let it drift up(or help it drift up)I am no expert.In fact,I have only had 1 soil grow and am only a week into my 1st hydro grow What I am is obsessive(says my wife).When I want to get into something or buy something,I research it to death. Just thought I'd chime in and hopefully help.BP

onehumanfamily

Any thoughts on using vinegar to regulate ph?

Genetic-Bob

I use distilled white vinegar as pH down. it has the added benefit of acting as an anti-bacterial/fungicide.

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5'5"BUD

Please forgive me for Jacking like this ...but this sounds like my problem................Can someone pm me and let me get this straight.............The below post will explain the problem...............I have used epsom salt...................My Ph was screwed up before (always too high.........) I used it...........I used it to try and fix the yellowing leaf problem.........I am using Ph down 4 or more times a day...............Am I to understand I should let the PH drift Up..........It has gotten high .........even higher than that..............How long should I let it stay there...........My plants have really slowed down...........Nice buds...........started.....But if this continues..............Then I will get a poor harvest like happened last time.l
https://www.hempcultivation.com/420/...557#post641557
https://www.hempcultivation.com/420/...ad.php?t=74771


Thanks and sorry for butting in like this....................

55

quartersack

i had that problem and im trying to recover now. i was using city water and someone told me that the calium was to high and was causing mg deficieny. is this true?

airedog

You can use CalMag Plus or a similar product to rectify this problem. As with any additive, start small and increase until you find the effective dose.

For what it's worth, I've also heard that magnesium deficiencies can also be the result of using RO water. If your nutes are not balanced or formulated for RO water it can cause problems with magnesium levels and other trace minerals or even pH fluctuations. Many growers now use a blend of RO and tap water to try and even this out.

As with most of what I write, this knowledge was often learned the hard way and I am passing on what others shared with me.

Ain't it a wonderful journey....,

Airedog