Input welcome

[Milo77]

coco rinsed with 5.7 calmag - mixed 70/30 with perlite
cobs 20 inches high at the moment
greenleaf nutrients as instructed on all packages
megacrop / sweet candy / bud explosion / greenleaf calmag
BioAg ful-power as instructed
4 mephisto double grapes 36 inches tall
1 mephisto stilton special also 36 inches tall
heat fluctuates 68 to 77
humidity veg-65
flower- 45-53
5 gallon Air-Pots - 13.8 liters
lights are on 24/7
today was day 54
fed daily with plenty of runoff
ppm's gradually increased through the entire grow
last feeding was 953ppm's Highest registered PPM feeding was 1153
PH has been 5.7 to 6.0 with a bluelab ph pen that is calibrated and clean
All water has been RO
problems started showing ten days ago
FIRST COCO GROW ALSO

what do you think sensei? @Waira

 

[Waira]

:smoking: Hmmmm,... are you feeding often, and how much run-off each time? Coco absolutely cannot be treated the same as true soil, it doesn't behave the same way at all,... a lot of do's and don't's, so if you haven't researched well, you're in for a rough ride likely,.....
...if you have stand alone pots, hand fed (never water alone, BTW it may screw up the coco's CEC, cation exchange capacity), you should be running lower ppm's, fed more often, and most critical, 15-20% run-off each time, measuring pH and ppm's going in and OUT... this is how you monitor nute salts build-up, and prevent them,...
That said, I think you may have a toxicity issue starting up,.... too much of certain things will mess with the uptake of others! I see suspect K toxicity, but the bitch with K is, defc. looks nearly the same,.. but with your feeds, it's not lack-of,.... So, you need to do a run-off check as mentioned,.. if you need to flush in coco, again never ever water alone... recommended solution is RO/Di water, with 150ppm Ca-Mg, plus another 150 ppm of base nutes, pH to 6.0... pour through until r-o is at or near input values,.... coco breaths and drains very well, so suffocation is less of a concern vs most soils,.... this si why it can be run under such constant moisture levels, and nute levels,... more like hydro is many ways,....

 

[Milo77]

Right on man, I will check runoff tomorrow.
When I do water I’m getting more than 20% runoff, I have a homemade drain table. Easier to shop vac it all up at once. Up until the last two days I have only been watering once a day and the pots have been lighter but nowhere near dry. I assumed it was k. Just because the bud explosion is higher in that then p. Thanks for the input sensei. I will post with runoff results tomorrow.

 

[Milo77]

First plant done
PPM of water used- 343 PH- 6.0
1st gallon PPM OUT 1394/ PH 6.7
2nd gallon PPM OUT 966/ PH 6.7
3rd gallon PPM OUT 659/ PH 6.7
4th gallon PPM OUT 527/ PH 6.7
Last 1/2 gallon PPM OUT 504/ PH 6.7

Heading to the store to buy distilled water, I don’t have enough ro to do the rest and also be able to water the other tent. I expected the high starting PPM but not the steady and high PH. @Waira

I’ll check back after my water break.

 

[Waira]

whoa! Milo, what's the water source you use, and is that 343ppm of just the water alone, not adjusted? Ditto for pH?
run-off ppm's aren't that bad actually, high, but not a red alert,... How much of the BE are you using? Are you reducing the amount of MC in turn? Feed ppm's are OK, but I'm wondering how much of the ppm is BE, same for MC,.. I'm trying to see if there's a toxicity issue maybe,... That said, if you have very hard water going in, the Ca may be accumulating to the point it's messing with K uptake

 

[Milo77]

I use RO water that comes from a well that DOES NOT go through a water softener.

RO water- 12-13 ppm / PH 9.0

Water out of tap - 340-378ppm/ PH 7.5

I only use the RO water, even to fill the humidifier.

All the runoff numbers above are consistent for all six plants. Today’s feed for those plants was this — 8 gallons RO water. BioAg 240ml, MegaCrop 18g, Bud Explosion 8grams, Sweet Candy 10grams.
PPM’S—660/670 PH— 5.8/5.8. Each plant gets one and a half gallons, in my opinion that is plenty of runoff. YESTERDAYS runoff was 608ppm with 811 going in. TODAYS runoff was 838ppm with 660/670 going in. My problem is that if I add Greenleaf calmag at the recommended dose the ppm is well tover 1000ppm. So my plan now is to water every 12 hours which should eliminate using a half a gallon per plant. Along with doing that I’m also going to use Sweet Candy on one watering and then sub it out for a lighter dose of calmag on the next watering. Hoping this will keep the numbers in check. My other tent has 3 gallon smartpots with ONLY COCO in them. These plants have been getting fed the same dosages as the plants i’m having problems with. They are also 14 days behind and just started preflowering so I might be having this problem twice, which I would love to avoid. I’m assuming that the AirPots got dryer than I thought and this may have caused the problems?? I started the Bud Explosion at full dose (.25per ltr) when preflower started and kept the MegaCrop at suggested dose(4g) also. Figured I would back off on the MegaCrop as harvest approaches like I always do. These plants stretched longer than I’ve been accustomed to with mephisto strains. These “should’ve” been done by Christmas (70days). However it’s a new medium for me so that’s not a big surprise. Anyway man I think my rambling is over. If you need anymore info just let me know. I’ll just keep on doing what I’m doing until I hear back from you. Thanks again sensei, always a pleasure hearing what you have to say! This rounds on me cheers.

 

[Waira]

... good on the water mate, but that pH on it is straight up puzzling,.. 9.0 is quite alkaline, so either the pH meter or the TDS is out of calibration because there's no possible way to get that kind of alkalinity in RO water with that low of ppm, ditto the tap at 7.5... (accidental swap there maybe, that' make sense in fact...).....I suspect the pH meter far more, TDS seems to hold far better over time,...Recent calibration (7.0 and 4.0), stored in the right solution, never dried out, old...?
...in/out ppm's are OK, but mind the difference going over 250-ish ppm,... good on the staggering of Ca-Mg, remember MC has some in it already,... SC is mostly sugars and amino's theoretically these don't add much to the ppm's because they are not ionic compounds,.. sugars certainly dissolve, but unlike true salts, the sugar molecule remains intact, no charges on it overall, while salts break into +/- charged ions of course, and this is what TDS/EC meters read... more free ions mean better electrical conductivity, which sugar soln.'s don't do well in comparison...
...well, note that BE is very K biased, not the best ratio for early bloom, but great for mid-late to finish; if you look at many of the PK boosters, particularly ones made for early-mid+ bloom, they are high in P:K ratio,... this is a general trend though, not dogma!
Are symptoms still progressing? IS there a strong breeze across the tops? I see that edge curling going on, usually a light/heat/transpiration stress sign,.. this could also promote too much K transport to those leaves, causing the teeth tip burning,.....

 

[Milo77]

Bluelab ph pen, almost a year old, calibrated and cleaned every month. I add a couple drops of solution to the cap after every use and always stored upright. I rinse it with bottled water and shake off excise water before storing. I just cleaned and recalibrated for the pictures that follow. 18 inch fan set on the lowest setting blowing at the tops of the plants and also the cobs, box fan set on the lowest setting moving air in the opposite direction on the bottom of plants. exhaust fan set at about fifty percent to pull air in through the vents, two bottom vents open, one top open behind oscillating fan, tent exhausted outside. I also took a measurement of the leaves that are curled with an infrared temperature gun, 71-74 degrees, lights 18-20 inches away...They are not getting any better and two are actually getting worse. Its typical hard well-water, should i not run it through the RO and just use it as is? Im assuming the plants that are 14 days behind these will end up the same way if i continue down the same path i have been. Maybe i should just go back to soil or not run MegaCrop with coco. Great veg growth using coco and Megacrop, flowering hasn't been pleasant to say the least. Let me know if you need any more man. As always man I appreciate the help and knowledge! Talk to you soon!

 

[Waira]

... good on the pics Milo',.... OK seems dialed in, the RO pH is weird, but truth is taking a pH reading in such low ppm water is basically pointless because of the wya pH meters work, how they are measuring the pH,... no reall need for it anyway if the ppm's are low,... Usually if anything, the pH is below 7.0 because CO2 dissolves into the water, reatcs and makes carbonic acid, very very weak, but still an acid,...
Stay the course on the water, just be sure to add that Ca-Mg in very time,... MC isn't great at all alone for bloom, too much N not enough P,.. best find a bloom booster with more P:K, or about even ratios, save BE for finish,....
18" fan is pretty heavy unless it can be set quite low,.. too much air movement can cause the mentioned issues with transpiration rates,.. T is fine, but the rapid drawing and evaporation with high air movement is what I'm driving at here,... a gentle sway is all you need,...and I;'m not 100% that's the problem, just a potential mitigating factor,....