Ph runoff Issues
So last Thursday I flushed my plants for the first time and found alarming results. Some of the plants runoff was ~ 6.2 when the intitial solution was ~6.65 these plants are not a big deal I will just water them with a 7 ph solution. The problem is that I have a couple of plants with a runoff of ~ 5.75 when the solution being put in was around 9 ph. So now the question is do i flush the plants untill the runoff is at a good level or do i continue to use a 9 ph solution in watering to try and gradually bring up the ph.
How long have they been in their current soil? it may be time to re-pot or transplant. Usually after 6-8 weeks the buffering agents start to dissolve and flush out causing ph swings.
Originally Posted by themastermind
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thats a story all in itself. 4 plants have been in MG for 7 weeks and 4 others have been in a combination of fox farm classic and MG for 5 weeks. Initially I had only a drop ph kit so I have determined that my ph was way too low for the first 4 weeks. I just got a hanna ph meter and am attempting to begin to regulate the soil ph. The problem is that I cant continue to flush the ones with the MG soil because it holds water for at least a week after due to MG soils terrible drainage.
It is well past time for you to transplant to new medium, and on top of that, you've got severe acidity buildup starting to occur. When pH 9 water runs off at pH 5.75 or lower, you can bet your soil is running 4-5 if not lower.
Transplant and flush hardcore.
I am already in 3 gallon pots i dont know if I want to go any bigger. Anyhow I dont know if its a good idea to transplant so close to the 12/12 cycle. Even if I were to go to a bigger pot, would there be any advantage?
I transplant all the time even a few weeks into 12/12 if I see problems. A little stress is good for the bud.
The advantage would be more natural buffers to help keep your pH in a more ideal range. You're looking at wild pH swinging and that is NOT good.
I transplant a couple of weeks into 12/12, too. As a matter of fact, the practice is recommended. It helps replenish soil and the soil buffers, gives 'em more root space, and I can adjust perlite to fit the current season/situation. (more perlite equals better drainage)
Likely they have been in the same pot a while, as it takes a couple of months for the soil buffers to deplete. This applies to any major brand of peat-based soil.
Monthly flushes to remove built-up nutrients can help stabilize the ph and remove excess nutrients and micro's.
Mixing soils from different companies is usually a bad idea, as different components can compete/amplify/interract with each other. Often with an undesirable result.
Never re-use soil unless you know what you're doing. (adjustments/ammendments necessary)
How are you calibrating the ph pen?