Good evening,
Last night I finished up going over the post on this thread. There are a lot of tips and tricks in the five hundred or so posts here. However, the value lies in the in depth replies. I enjoy the stories and the underlying wisdom that go with them.
The other three posts in my post count are on Over the Hill. There is a little background information about my setup and grow history there. The first post is here: over-50-club
I have been having some ph problems that began innocently enough. I, on the other hand, have managed to compound a small problem into one where the good news is everybody is still alive and going to live. Truly 6 plants were as near death as any I have ever breathed life back into.
Everything was preventable. I plead guilty to being 50 miles from a freeway, 120 from a Lows, old and lazy.
My earlier up grades were ro water, a PPM, a soil ph meter, and one for liquids. I tested from the input water to the runoff. It was like magic, everything just kind of balanced out. I even ran the filters too long, no problem. It was just too slow. I upgraded to a better one but did not keep up the monitoring.
From about here on I am asking anyone who disagrees with my assumptions to say so. I am not even sure what happened first.
This is my best guess is as to what happened.
Six months to a year ago I blew a ro membrane. This resulted in basically chlorinated city well water with a ph of around 8.7 with a TDS around 120.
Last December and in February I picked up a total of 12 strains as "unrooted" clones. If you don't know, that is a stick in a cube in a cup. $10 11 of them were new to me.
In about the same timeframe I was winding down from a disaster referenced in an earlier post. From that mess I kept two known strains, an unknown sativa hyberd and an unknown California bag seed for fun.
About the time the clones were getting established in 6" pots things were getting weird. I narrowed things down nutrient lockout and fixed the ro problem. But nothing really matched up from looking at deficiency pictures.
A few days later I wake up to a near dead plant. I did all the ER treatment I knew. Next day another plant until about half of my plants were on life support and most of the rest were sick.
As it turned out I was doing two other things that I did not pay nearly enough attention too. First, I switched from b1 to Thrive Alive. Straight out of the bottle that stuff must be about Ph zero. The other was, I switched soils because it was what I could get. It turned out it is/was acidic and had more nitrogen in it than I personally think something labeled potting soil should have.
Three known problems, three timeframes, that is the setup for some questions. Don't worry I am only going to ask one for now.
Is there an upper Ph threshold for calcium and magnesium uptake or other negative effects? If so, what do you look for? I don't want to burn up a lot of time researching something that is not a problem.
TIA
I never know
Best,
Canyon