I have 4 in a 4x4, ak-47 and bubblegum are the strains. Temp is 79 during day around 65 at night. Humidity is around 35%. I’m coming up on week 4 of flower. I believe all 4 are showing signs of deficiency and isn’t just regular yellowing and dying leaves during flower. It’s my first grow and need some advice on how to fix their problems. I water using RO and have recently been giving small amounts of cal mag (from 100ppm to 200) each watering along with 2 feeds of flower time fertilizer from Robert Bergmans line.
Front right-PH-6.0 PPM-1054
Back right-PH-5.5 PPM-2109
Front left-PH-6.1 PPM-1002
Back left-PH-6.5PPM-1704
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What media are you growing in?
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Fox farm ocean forest
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I’ve had to correct my pH a few times. I always flush if I have to change the pH by very much. You’ll want your pH around 6.5 at this point. I’d flush to correct for pH and then adjust your PPM where you want it.
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I’ve been adjusting the ph close to 6.5 whenever adding nutrients to my ro water since I’ve added flower time nutes the ph get outta that 6.5 range…my guess is the nutrient solution didnt dissolve all the way (nutes lowers the ph of my water to around 5-6) I then add ph up but probably didnt stir enough to have nutes completely dissolve, lowering it back down once I water the soil. To properly flush would I put 5gal of ph’d water through my 5gal pots? And if I want it up from 6.0 would I want the flush ph to be 7 to raise? Or 5.5 I’d do 7.5? Or should I flush at the ph I want it to be
I had these pH problems when I was using a soil with a lot of peat in it. I suppose the peat was breaking down and kept dragging my pH down. You should be stable in OF though.
I would probably do it with 5 gal. Most people won’t go any higher with their pHed water than 7.5 or 8. You’d then flush with as many gallons as it takes to get your runoff to your target (6.5). It’ll probably take more for your plant currently at 5.5.
I’ve had the best success when not using distilled or RO water for a pH flush. It’s hard to adjust pH using water with no minerals / dissolved solids in it.
Flushing will run your PPMs down quite a bit. Be sure to check PPMs and adjust after you get your pH corrected.
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Thanks for the advice/info I appreciate it
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Any idea what’s causing this…it started showing signs after flushing then quickly got worse. Have fed it flower time nutes and cal-mag since flushing
Do you know what your pH and PPM is?
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Yep that’s a magnesium deficiency, did you flush with something like Bushdoctor or just lots of water… if you used a chemical type, put a couple more gallons of just 6.4 ph’d water thru her till your ppm come down to a good level, around 500 to 800 depends on the strain. On the last gallon I’d add one teaspoon cal-mag and full nutes of whatever you use adjust the ppm to around 400 in the water before you feed her, and that color should go away after a few days! Just re-read this all and @FixerPower has you covered! Good advice up there.
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After flushing the ph is at 6.35 ppm around 5-600. My first water after flushing I gave flower time nutes 750 ppm with a small amount of cal-mag. Today I gave it about 400ppm of cal-mag. After the first water I guessed that since FT nutes didnt slow down deficiency maybe calmag would. Also I flushed with faucet water to up my ph…the rest of the grow has been with RO
Firstly, the damaged leaves will likely stay that way. Any changes you make will normally only be visible in the new growth, which makes it more complicated because you are no longer vegging. I would suggest, the flush to the desired PH range with regular phd water. Followed by a regular ( as shown on the bottle ) dose of calmag and ph that. Allow this to dry out a tad and then a regular dose of your selected fertilizer of choice, let that dry out a tad followed by watering with phd calmag and so on. The deal is you need to maintain the ph or all the food will just sit there unused and eventaully build up and cause lock out. The calmag will allow the plant to recover from the deficiency and supplysome much needed nitrogen. You will still be feeding but just not as much. Thats good because less is often better .
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Got the runoff to 6.3 from flushing but didnt add any nutrients…that’s when this deficiency started. I also fed with high ph the last 2 times, around 6.8 to try and bring the 6.3 up further. Today I added calmag so you do u think my problem was not adding nutes right after flushing or something else. This is my first time growing anything so I’m a complete noob testing out my green thumb…from the looks of it I’m gonna need to work on it
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Yes it sounds like your PH may have been locking out some nutrition. Once you get the ph back on track, the first order of business is to deal with the deficiency. Keep in mind, the damage that was done is done and will forever remain that way. The future of the plants health requires a bit of patient coaxing. If youbare keeping a simple log, you can track what you did wrong and in the next grow hopefully avoid it.
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