Yellowing of small top leaves (week 4 flowering) is this normal?

Your still showing magnesium deficiency, yellow edges, yellow margins, green veins. Keep up with the cal mag. 5ml/gal till the end. Epsom salt wouldnt hurt either. Proper calcium addition will bring down your potential hydrogen.

fskitch said:

Your still showing magnesium deficiency, yellow edges, yellow margins, green veins. Keep up with the cal mag. 5ml/gal till the end. Epsom salt wouldnt hurt either. Proper calcium addition will bring down your potential hydrogen.
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I sincerely appreciate your help. But wouldn’t the ppm being so low explain that? I seriously ask because I’ve never stopped adding calmag to every feed and gradually added more as they grew (now at 5ml per gallon) so i never considered it.

No12u said:

But wouldn’t the ppm being so low explain that?

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not sure about your ppm—-just reading the leaves

No12u said:

Since this post I’ve lowered my ph to 6.2 for the last two feeds with calmag included.
Calvin.m16 was correct when he stated my ph was to high, when i tested the runoff it was at 7.1. I finally received my ppm meter and when i tested the runoff the ppm was 197. I then tested the feed in water using cyco and clavins recommendations 12ml per gallon the ppm was 680, which is way to low from my understanding after researching the ppm for a 6 wk plant. Everything I’ve read says it should be at least 1000-1400. I doubled the dose of feed and i got 1114 ppm. I haven’t feed using the double dose yet was hoping to hear from cavin.m16 as he says he has the same nutes and lights. Is it safe to say they are not eating my nutes and turning yellow because ppm is way off.

edit: Tent pictures are from yesterday. Babies out tent are today after flush.

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Hopefully you got things dialed in, sorry I didn't see you tagged me in the post since you forgot to add an @ symbol before my username.

CYCO like most brands requires more than what they advertise to hit PPM/EC targets.

I have since switched to MaxiBloom for flowering but I still use CYCOs Grow A&B for veg, it just works too damn good and when I buy in 20 liter jugs its not too expensive.

Here's a tip for 2 part fertilizers that call for equal parts, divide your desired EC by 2 and just mix A until you hit half that value then mix B until you hit the final desired value. MUCH better method than ml/gal or grams/gal mixing.

I have changed things up for bloom, I'm in Reverse Osmosis water so I use Armor Si 5ml/gal, CaliMagic (5ml/gal) to start, then I mix MaxiBLoom dry fertilizer into the reservoir, stirring until fully dissolved each time until I hit my EC target, I don't measure it in grams or any of that as I see it as extra unneeded steps.

I feed 2.0 EC in bloom start to finish with no drain to waste, just water until a little floods out into the drain tray and let it drink it back up.. This has given me no issues where runoff actually has caused me to need to feed more and fuck with pH a lot. The key with Maxibloom is if the plants aren't too green then your good to keep feeding that strength, if the plants start getting dark green then pull back on strength.

Lemme know how your grow is doing, hopefully well!