Problems In Coco Please Help

I am having some minor problems with all my plants in 75% coco/25% perlite hempy buckets they are yellowing between the veins pretty heavily.There are 8 different plants all are grown from seed.4 of them are Ketama and the other 4 are Afghan Kush both are supposed to be landrace strains from W.O.S Seedbank.So I first sprouted the seeds in solo cups and was watering them with about 250ppm nutes until I transplanted them to there new homes the 2 gallon buckets.I then upped the nutes to about 500ppm and the yellowing still persists.I thought I was overfeeding them so I lowered the nute strength by a 100ppm or so still no improvement I am afraid to bump the nutes up any higher because I dont want too burn them.So now I am here looking for advice if you can offer some that would be greatly appreciated.I have been giving them 5ml/Gal of A&B 8ml/Gal Rhizotonic and 5ml/Gal of Cannazyme at a PH of 5.8 to 6.0.I also added some Subculture M & B to the Coco when I transplanted a week and a half ago.Heres some pics too help out the diagnosis.I was watering every other day until I talked to a guy at the hydro store who said wait about 4-5 days too water after transplanting so I cut back a few days.They have been in the tent about 1.5 weeks so far sprouted under four 39w T5HO lamps before moving to 400w MH.


So heres my setup:
Method: Hempy Buckets
Medium:75% Coco/ 25% Perlite
Nutrients: Canna Coco A&B,Rhizotonic,Cannazyme,PK 13/14 and Canna Boost. I also have Cal-Mag+.
Lighting:Blockbuster reflector with a Lumatek 600w Dimmable currently using 6500K 400w metal halide about 30" away from the light currently too harden them off.
Location: 4'x4'x6.5' Grow Tent (not a toxic pvc tent its made of canvas)
Temps: Day 82 degrees max, Night 73 degrees at its lowest.
Humidity:40%-50%
Cooling:6" 440 cfm fan cooling the tent and light via a fan speed controller on medium to low setting.

Anybody got any advice?

I will bump them up to 700 ppm and see what happens.

I bumped up 7 out of 8 to 700ppm and flushed one with 250ppm water 200 ppm of calmag and 50ppm was my strarting tapwater ph'd this to 5.7 for flush.It took 5 gallons of water to get the runoff ppm's down to 250ppm 5.9 ph to match the input water. To me this is nutrient buildup causing some kind of lockout situation. Am I correct in my thinking that the ppm should be lower coming out or else I am overfeeding them.That is how I knew when to up my nutes in DWC never experienced this problem with that.Also how do I lower the ph of the coco as well as check it. After reading some runoff is not the most accurate way to determine the ph of the coco.

"once again you have judged correct" LOL, all jokes aside thats a ph prob causing nute lock what kinda coco you're using?

I am using Nutrifield Coco that came in a compressed brick. I didnt rinse it at first because it said it was prebuffered to prevent calcium and magnesium lockout. But when I first started to flush the runoff water Ph was coming out around 6.2-6.4. Can that cause a ph lockout? I ph my incoming water to 5.7-5.8.

i figured!..found out when using compressed bricks whatever the pH of the water you use to expand the bricks with it takes on that pH permanently, you can use pH adjusted water but it will keep resetting itself back to that first waterings pH. when i use bricks i never use tap water use distilled or r/o water with calmag+ and i foliar fed with seaweed once a week in veg. because coco naturally absorbs K,Ca,& Mg your plants cant get enough for itself if the coir needs aren't met first(all of which are probs noticed in your pics).

My tapwater only has 40-50 ppms and I have aquarium equipment that tests for calcium levels usually about 10-20 ppm calcium in my tapwater and the water report from city says about the same thing.I was not adding cal-mag because canna coco nutes list calcium at 5% so I was not sure if I would need it.How much cal mag would you suggest I use. I am gonna flush all of them with 250ppm water 200ppm calmag 50ppm tapwater to flush the excess nutes out and start feeding low when they need watering again.When I expanded the bricks I used 6.0 ph. I think it got high because after mixing my nutes I would ph after adding the rhizotonic and then water immediately but found out today after letting my calmag water sit for an hour with only 10ml/5 gal rhizotonic that the ph climbed up 1 full point. This should be easier to correct since I expanded them with 6.0 water right? if its stuck at 6.0 i will just ph my nutes to 5.5 and let it drift in that range will that work I figured it had to be a ph problem or deficiency and Ph causes deficiency lol.

P.S. thank you symbiote420 you joined this month and I have gotten more responses from you than anyone else.

So Im having the same issue, except my girls are lookin much worse in the flower room... Last night my feed I PH'd 5.7 going in, and the runoff PH'd at 7.0! So the local grow store guy who sold me my setup said to mix the next feed tonight down to 4.6 to even the coco medium out. He also asked me if I had been letting the girls sit in the runoff..... I answered "of course, thats what you told me to do".... He corrected me and told me NOOOO... you need to get rid of that runoff water... Is this the case? Wouldnt this be a waste of water AND nutes? Or is this the way you feed coco? Im new to the coco, and fairly new to growing... Any advice?

No you dont want it it sit in the run off water. it will collect and eventually become toxic. They need to be in trays or some way to let the excess run to wast. first thing you do is make sure your not having a temp issue. second turn off lights spray with water and and also flush entire medium with water as well. talking bathroom tub run off. let them chill for a bit and hopefully they bounce back its always better to under than over and dont watn them to burn. second coco strips cal mag from plant so adding some after the flush is the best bet good luck

I have flushed all with calmag+water only @4ml/gal and 5.0 ph to bring the runoff ph down to 5.8 from 6.5 and the ppms down to 250.I am sure now that it was ph lockout mixed in with a little overfert action. Its only been two days since flushing and they are looking a nice healthy green at all the growing tips instead of a dull lackluster bluish green color like before. F**K you Ph I will defeat you..........LOL. I know runoff ph is not the accurate way to test coco ph but hey if my runoff goes up 1.5 from the input there is obviously a high ph in the rootzone.I will be watering at 5.3-5.5ph from here on out.High Ph problems is why I switched to coco Tried a homemade NFT but the Ph climbed to 6.5-7.0 within a few hours but the symptoms were a little different still got the dull color but some plants stretched out (K shortage) and some stunted real bad ( P shortage) and no interveinal yellowing.

jayfury said:

So Im having the same issue, except my girls are lookin much worse in the flower room... Last night my feed I PH'd 5.7 going in, and the runoff PH'd at 7.0! So the local grow store guy who sold me my setup said to mix the next feed tonight down to 4.6 to even the coco medium out. He also asked me if I had been letting the girls sit in the runoff..... I answered "of course, thats what you told me to do".... He corrected me and told me NOOOO... you need to get rid of that runoff water... Is this the case? Wouldnt this be a waste of water AND nutes? Or is this the way you feed coco? Im new to the coco, and fairly new to growing... Any advice?

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I use a 50/50 of coco and shanghai moss. Always flush any medium before using it. Also, yes, get rid of the runoff you can always get more water by dechlorinating tap water or collecting rain water. I only use rain water because it is the nectar of life.

Reading the mediums pH runoff is handy but you need to understand what is happening. If you have ferted a few times expect pH to drop as fertilizer salts accumulate in the medium, low pH and high ppms in the runoff indicate you need to flush to remove salt buildups and not that the grow medium is acidic. With a flush the pH should rise back up to the normal level and then reaply the ferts to the coco.

I know coco is cal/mag deficient but you said it had been pre treated for this. PPm your water with cal/mag if it has a low ppm to start with always or you will get cal/mag problems after a while.

Looks like the same issue I was having with my coco... it was a CALMAG issue for me... bumped up the CALMAG in my water and shazam problem solved... good luck

I think coco needs to absorb some cal/mag first before there is enough present for the plant, dosent the coc suck up the cal/mag before the plant can until higher levels are added?

coco needs a "restart" every now and then by flushing. never hurts and helps to clean salt buildups, keeping your medium ppm as you want it. flush, let sit with clean water for a while, then start feeding gradually to your plant's satisfaction. 500ppm (at .5 conversion) sounds just enough for those nice looking plants, I wouldn't give more at this stage.

I watered them last night with 3ml/gal cal-mag , 5ml/gal Canna A&B , 8ml/gallon Rhizotonic and 5ml/gal Cannazyme for a total PPM of 600 at .5 conversion and Ph'd it to 5.5 and my runoff was lower than the input water in PPM's and had a Ph of 5.7-5.8 per plant. The flushing definately helped the newer growth looks healthier and alot greener. I will continue feeding at this strength until the runoff PPM's drop a couple hundred between waterings.Also I have heard mixed things about watering coco should I water when the pots are close to dry like soil or when its still a little moist? I have been watering when its barely moist as of lately every 3 days or so.

Never let it dry out completely. It's best to go by weight, when it feels light then water. Coco is like an organic sponge, it may look dry or feel dry but all that moisture is trapped in it's core. Once you get a feel for the wet/dry weight then go by that and try to stay off of a set schedule, let the plant decide when she's thirsty.

THEWIDOWER said:

I watered them last night with 3ml/gal cal-mag , 5ml/gal Canna A&B , 8ml/gallon Rhizotonic and 5ml/gal Cannazyme for a total PPM of 600 at .5 conversion and Ph'd it to 5.5 and my runoff was lower than the input water in PPM's and had a Ph of 5.7-5.8 per plant. The flushing definately helped the newer growth looks healthier and alot greener. I will continue feeding at this strength until the runoff PPM's drop a couple hundred between waterings.Also I have heard mixed things about watering coco should I water when the pots are close to dry like soil or when its still a little moist? I have been watering when its barely moist as of lately every 3 days or so.

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sounds like a good way to handle ppm for coco as well. as for waterings, after much research i've found that it should be allowed to dry some when plants are young to prevent overwatering which can happen in coco, but once the plant has rooted it can be watered every day, even more. i'm not sure though, what benefits daily watering has as opposed to every 3-4 days say, this is debatable.