Some trouble in coco - ph or cal mag?

so i have a few good soil grows under my belt for 3 years or so but have switch to coco and am having some problems. I'm doing a perpetual grow and my mothers and veg plants are fine, but when i flower i seem to get yellowing of the entire plant. red stems, green veins, starting at the bottom, stunted bud development. i recently started using a better ph meter as my tap water read 8.5 with the dropper tester and the meter reads 7.2. also, i have been adding botanicare cal mag recently. i assumed it was due to these two things, but a few weeks later i have the same problem. my tap water is about 140 ppm.

using Iguana juice bloom, sensi grow and other AN products (including Sensizyme - an enzyme). cal mag as stated before, ph water after nutrients to 5.8. it is a small space with 400w hps fixture but two computer fan ducts exhausting air and a sheet of glass for heat. i water every 3 days with settled tap water. strains include utopia haze, sour diesel, vanilla kush, laughing buddha, tangerine dream but they all have the same symptoms

the second picture is the left side, some really hurt plants all the way to the left . this is what happens when allowed to flower they should be done in a week. they get younger in flowering as they move to the right as seen by the yellowing of the ph, cal treated plants highlighted in blue. in the first picture you can see how the bud sites are still nice and green as the fans turn yellow.

thanks everyone, i have already learned so much from this site

goldfish

Looks like very yellow plants, red/purple stems and dust in your fan
I would say your having deficiencies. I don't know if you ever flush water through the pots to leech out the salts that can accumulate. Things can get toxic down there with these strong potions.

i flush between flower and veg and also 2 weeks before harvest with clearex... i know th fan is dirty haha ill clean it. problem is though that it only takes about 2 weeks in the flower area for these deficiencies to occur. i have been adding plenty of nutrients though and thats y i feel like theres another problem...

does the leaf yellowing start from the bottom?
define "plenty" of nutrients

yes, it does start from the bottom. usually affecting the bud sites last. if my nutrients say 4 ml per liter, i usually do half strength, then water only, then half strength again all in one week. or sometimes just full in the beginning of the week. there is a lot of watering done with the coco because my pots are so small but compared to the amount of grow nutrient i use, the flowering nutrients are about the same at the same time to make things easier.

thanks for the replies!

I bet if you test the run off the ppm will be high. The quantity of salt based nutes could be adding up below the soil locking out proper uptake.

I'm assuming everything else is dialed in...

I would flush, then a reduced feeding.

flush, then add extra "AN micro 5-0-1" if thats part of your lineup (basically the only AN product i use)
i, personally would go to wally world and buy some Miracle Grow 24-8-16 and add a TSP of that to your bloom nutes.

thanks for the quick replies...

ok i will flush tomorrow. i jsut bought a RO machine as well 4 stage so hopefully this will be good. clamdigger, do u suggest the miracle grow for the nitrogen? do they look nitrogen deficient? im always affraid to assume that in flowering.

goldfish

im now exploring the fact that my organic bloom nute is about 2 years old... and also the fact that i have a 400w hps filling a space that is 12.5Wx35Lx50H". any comments?

flush, flush, flush

next time before you flower, think of using more N, remember plants in flower still need it to pack on the growth. I may be wrong but a real organic never goes bad. 400watts, 3 sq ft. ya its alot, I dont believe it would be the problem though...how are your temps?

See any bugs? gnats?

Temps are pushing up to 85F. no bugs or gnats. i moved them to a bigger area, because its starting to get hotter outside so temps will definetly exceed 85 in the future. i did notice a little bit of leaf curling on the edges pointing up to hint at heat stress.

Let's have a properly white balanced photo, please! In the first pic there is a leaf with grey/darkened leaf tips curling upwards, onto itself and towards the stem... but I can't see it clearly.
I'm growing Utopia Haze and symptoms like this are prevalent on a couple of my batch of girls, I hope and think the trend is halted soon.
I'm growing in soil but there were pH issues (too low; P lockout) and lack of sufficient Mg+Ca in my feed.

I'm going to try and offer a diagnosis here after listening in.

To start I'm not sure what EC your solution is, or what volume you are using each nutrient, but I do know that your water isn't ridiculous. I also don't know what size your planters are, but based on the size of the plants and your watering frequency I'm going with 4 or 5 gallons.

The look of the plants - yellow leaves, purple stems, blotchy "grey" necrotic leaf mass - all of that points to a phosphorus deficiency. In addition, the general lack of yellow throughout the plant would also suggest a Nitrogen, Magnesium, and Sulfur issue. Damn near everything...

The inclusion of a new pH meter is a good idea. I'd suggest ensuring the calibration is dialed by getting yourself some 7.01 and 4.01 solution. It could be a pH issue, even in coco... I don't put my money there... but it's just one of those things. Like making sure the computer is plugged in if it won't turn on. Gotta check it.

The overall need for food points to a root issue, something is interfering with the uptake of nutrients and this something is probably a new addition if the plant had been growing well up until recently. I think that the enzymatic solution Sensizym would probably be your most recent addition and this stuff is directly related to your root system. Also, you're probably right about not using a 2 year old organic nutrient. I bet that stuff smells like some serious ass.

The inclusion of a RO filter is great, this should help straighten out any sodium or bicarbonate in your water which could interfere with uptake.

Going forward I think this is what you do. RO yourself some water, add in about 150ppm of Cal-Mag and another 100ppm of a pk booster. This should give you a pretty balanced 250ppm solution. Use a 5.8 to 6.0 pH.

Use 2-3 gallons of this solution per gallon of media. Lots of runoff.

You'll probably want to begin using a new nutriet A bottle of Botanicare Ripe 1-5-4 for $10 and add a little Cal-Mag+ (1ml/L) to balance it out is a cheap and easy fix. Cut back on the Sensizym too. Keep your ppm level (hanna .5 conversion) between 600 and 950. Always try to include like 25ppm of some epsom salt for the Magnesium and Sulfur boost. Work on those roots and the watering frequency, and I'm thinking that maybe every 4 days might work for a bit until the roots recover and can take handle the sustained drowning they have to deal with.

Do what you can about the temperatures too. Topping out at 82 would be a lot better.

turns out that i was having a big heat issue. most of them are actually even turning green again.

thanks for all the replies all in all my grow is a lot more taken care of than before