I’m growing this batch since first days of march and entering now 4-5 weeks of flowering. Medium is organic soil with lava rocks and coconut fiber. All organic, no nuts, only added some Forza Silica for root reinforcement while in veg.
Around 3 weeks ago, I started noticing these burned tips that spread bottom-up in all specimens. Setting is all right, nice airflow, temp and humidity around 55-60%.
I usually water with tap, left sitting at least 24hrs for chlorine evaporation; I have no way to measure it but suspected of potassium deficiency due to high levels of sodium in the water, but also having no way to measure that, I just started watering with bottled.
I’ve invested a lot of time in this grow particularly and wouldn’t want to lose it. Does any of you have an idea of what’s happening here??
I was out for a couple of days, but back now. I tested pH and have two sets. Half of specimens are 5.0 and the other half is 8.0; not only out of range, but the problem got worse. (Photo attached)
Any advice on what could it be and how to normalize pH lvls?