think calcium def but progressing rapidly late in flower...help

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jdsworld

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Growing in coco using cana coco a plus b. Under 600 w hps in a 4x4 tent w carbon filter.

Was using just canna coco a.and b for most of grow upping to 25ml per 10 l of a and b as grow progressed. Now on day 56 of an expected 75 day grow. Few weeks ago began adding canna booster at a rate of 10ml per 25 w thw a n b feeding...then about a week ago began adding pk 13 14 at 15ml per 10l to.the mix

..everything seemed to be going great then this came out of nowhere and got progressively worse quick over last few days.

Wasnt sure if i had a cal def or a nutrient lockout so i responded with a non ph flush followed by reducing tje pk 13 14 to 5ml per 10l and the booster. Have been adding cal mag at 10ml per 10l last couple feedings

Any advice on whats going on and how to fix? Everything seemed fine when i was just using canna a n b but we werent at bud formation stage yet. Help... 20181209_173258.jpg

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Well my go to is always is pH? We treat Coco like hydro, in pot pH should be around 5.5 to 5.7.. you might be looking at a lock out.
 
:yeahthat: yes, pH: going in, in-pot, and run-off,... I suspect you're running this coco like true soil, which is going to backfire.. coco is not a true soil at all, very different from even other soilless meduims, many do's and don't's.... Are you using a TDS/EC meter to test actual nute concentrations? Are you feeding to 15-20% run-off each time, and tsating the run-off for pH and ppm's to monitor potential nute salt build-up? Watering alone is a no-no, it can screw up the coco's CEC (cation exchage capacity)... use Ca-Mg at least,.. What's the water source, pH, ppm's?
... symptoms look mixed,.....tops affected mainly? This looks like Ca defc. but might be a micronutrient involved as well,... How far away are the lights?
 
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