Originally Posted by siftedunity
since there are intelligent people here.. I have had nitrogen toxicity issues in my last two flowering grows using the coco a + b at 8ml per gal and the boost at 4ml per gallon. and the only way to solve it was to drop the whole solution down to 600ppm what worked out to about 5 or 6ml per gallon which resulted in the yield dropping off drastically when finished and the plants looked underfed and the buds under developed.
what im curious of is this.. can something cause nitrogen toxicity rather than an N lockout? or can another lock out cause the plant to uptake too much N??
this is in canna coco, regular tap water (100-200ppm) keeping the medium most, ph around 6.2 ish
and btw, this was definitely N toxicity or a general nutrient burning. the clawing, dark green leaves, some leaf tips bent at nearly 90 degree angles from the rest of the leaf.
You have several known quantities and one unknown. The Canna fertilizer is a known. There are several tests online and some here. So we know what fertilizer elements and the levels they are being applied at. The Canna coco is also a known. It's been tested as well so we know what we are dealing with when it comes to the medium.
What we don't know is what is in your tap water. 100-200ppms of? It would be interesting to see a water analysis on your tap water. They cost about $40 and you can get one here https://www.jrpeters.com/lab-services...tritional.html
My guess is you have higher levels magnesium in your water which can increase the flow of N. I would bet your Ca levels and Mg levels are close to the same in your tap.