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canna coco ph to low

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stilblazin

New member
I've recently been having problems of a similar nature...I'm using canna coco with canna coco nutrients and calmag...I'm showing calmag deficiency as well as drooping leaves,hardly any growth and now some yellowing and brown spots :( I have been ph'ing to 5.8 my run off is testing at 5.4 and when I did the slurry test from coco from the centre of my medium it tests at 5.0-5.1....don't know what is causing this,my last run with coco went great and I'm not doing anything different..i'm only feeding lightly about 2.5 ml per gallon with 3-5ml cal mag my ec is 0.6-0.8 as there only about 5 weeks old....any ideas or help would be great cheers...even after leaching with a lot of ph balanced water it doesn't come down for long...managed to get my run off from 5.4 up to 5.7 and plants started booming again for a few days but as soon as I start feeding at 5.8 as usual I seem to get lock out and virtually no growth :(
 
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stilblazin

New member
have also tested fresh coco from the bag in the slurry ph test and it comes up at 5.0..has anyone has this problem?
 
Buddler

Buddler

Well-known member
Veteran
stilblazin said:
have also tested fresh coco from the bag in the slurry ph test and it comes up at 5.0..has anyone has this problem?
Click to expand...

Have you calibrated your PH pen lately? i find canna is always neutral one of the best out of the bag .Or may be you have hard water and dont need calmag.. :tiphat: B
 
T

TribalSeeds

How often are you watering? If you water more often the ph should stay closer to your waterings. Allowing it to dry for too long can cause larger shifts in the ph.
Also, if you need calmag or not, I wouldnt keep feeding with more calmag than nutes.
I like Magical because it doesnt drop the ph of my water too much.
 
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stilblazin

New member
hey and thanks for the replies,have checked my ph calibration with a ph 7.0 buffer solution and it's spot on,water is really good when I put my ec,ppm stick in it I don't even get a reading and it messures down to 0.1 ec....I'm only watering every few days as I didn't want to overwater the plants....my last grow was my first time using coco and everything went great and come to think of it I'm sure I watered more often last time so will watering more often with higher nuiet-less calmag feeds and see how I go...thanks so much for the help,greatly appreciated :)
 
A

ak-51

picture.php


Based on this schedule, even the lightest feeding is 6mL per gallon. This is the schedule I go by and it works for me. I pH to 6.0-6.1, although half of the time when I mix up my nutrients it's already right there and I don't have to adjust it at all.
 
green thumbs

green thumbs

Member
My understanding is that calmag has a tendency to drop the Ph not the canna nutes. Like tribal seeds said use magical instead
 
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stilblazin

New member
thanks for the canna feeding chart,I've only just kicked the ec up to 0.8-1.0 and also readjusted my ph as my meter was faulty...bought a new one to compare it to and when you put them in ph 7 buffer bothe old and new meter read 7.0 but when you put them in solution they vary . about 0.5 so I figure(well hoping the old ones has issues lol...plants have had a massive growth spurt since so and veg is looking a lot more lush...am noticing some strains are alot more sensitive then others...I'm running some tahoe og and kandy kush that are pretty easily upset aswell as some chocolope kush that is super hardy and not bothered by much as well as blue widow,trainwreck and pineapple chunk that are so far looking pretty Indica/sativa balanced so far ( have heard some horror stories about a few of the PC's ending up way more sativa with some crazy long flowering times)
 
Snow Crash

Snow Crash

Active member
Veteran
Coco is typically very pH neutral. The only way for the pH to drop like that (because of what pH is) is that there is a buildup of elements in the media. Otherwise, the stuff should rinse clean.

Normally, my runoff pH in coco is around 6.4pH to 6.8pH so I would say that even on a snap shot without the slurry test that there is something amiss with the contents of the media. But with the slurry test, this fact is incontrovertible.

Here's what I would do:
1. Mix up 2ml Cal-Mag Plus and 5ml A+B. The EC in RO water should be around 0.6-0.7ec with a pH somewhere around 6.0pH or so.
2. Rinse, Rinse, Rinse! Just keep going until what is coming out is testing about the same as what is going in.
3. Repeat Rinse at the next watering with the same solution mix. NO pH down!!!!
4. Replace your pH down product. I can only assume you are using a phosphoric acid based product which doesn't get the attention around here that it should. Far superior results can be found with Nitric Acid or organic acids like Fulvic or Citric crystals. The price is often no different and the overall improvement to the plants will be noticeable very quickly. Of all the things I think your issue is coming from... I think it's your pH down.
5. Calibrate your pH pen with both 7.01 and 4.01 solution. Most (if not all) pens need both neutral and low calibrated for best results. Personally, I stopped fucking with pH in coco a long time ago and I let my organic acids and media buffer do all the heavy lifting. I just get it kinda close... I think.
 
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stilblazin

New member
Thanks for the advice it is greatly appreciated and will try giving them a good flush with above strength nuet n calmag and thanks also for the ph calibration advice,I've only been calibrating to 7.0 and not also doing the 4.0...have started to get what looks like a deficiency strarting on the middle and lower fan leaves,I will try and put up pics of the leaves but they are getting blue/grey then turning brown blotches :( as well as red stems,veins and new growth is very slow and a pale green and not nice and lush green if that makes sense
 
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stilblazin

New member
the condition of the leaves in first two pics is now happening on several of my plants and the third pic with the biggest darkest blotches is from the worst affected plant,funny thing is I have a couple of chocolope kush that are still thriving and looking great as well as one tahoe og that's still doing great while the rest are slowly getting pale new growth at a very stunted rate as well now developing these blotches,will start flushing them tomorrow as soon as I get some ph 4.0 buffer to go with 7.0 buffer and recalibrate my metre correctly until my runoff comes out as close to 5.8-6.0 as I can get..I'm just using normal ph down to adjust my water...once my nut's(canna coco A+B,rizo,cannazyme,calmag)are added my ph is normally 6.3-6.5 so am normally only using a few drops of the ph down to get it to 5.8-5.9...Thanks Snow Crash for the advice on the buffers,will definitely look into getting a substitute for the ph down :)
 
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