My pH study has me confused, thoughts?

That was an important part of it. Measuring runoff coming out immediately isn't very meaningful. It didn't have time for the soil to impart it's pH upon the liquid. The theory of that method is that the liquid sit in the soil and equalize for an hour. Then, displace only a measurable amount (i.e., don't dilute the equalized liquid any more than you have to to get a measurable amount.).

Regarding your runoff PPMs. If you took the soil sample from the top, it may not have much salt. It may have collected further down.

For me, 2000ppm is where I feed with more runoff and/or reduced strength. I like to keep it around 1800ppm (0.5 scale) in flower. If it goes to 2200, I feed 1/4 strength or water only (50% runoff, or more). If it reaches 2500 I'll see the plant falling apart.
Thanks for your help man, I think I will wait until my next watering to try the full test, I'd rather use plain water anyways.
Your point on PPMs makes alot of sense. I collected from about 2 inches down, but I'm sure the next 6 inches of soil has much higher buildup.
 

az2000

Well-Known Member
Thanks for your help man, I think I will wait until my next watering to try the full test, I'd rather use plain water anyways.
I don't think step 1 has to be plain water. When I tried it I used nutrient solution, like normal. Then did the displacement 1 hour later. It thought it would be interesting to see how it compared to your slurry test (and immediate runoff). It doesn't hurt anything to see.

It matched pretty well what the probe said.
 

chuck estevez

Well-Known Member
you're running L.E.D, it is my understanding that plants use more cal/mag when under led, your plants look deficient of those things, a bottle of cal/mag and fix your issue. you can't have a salt build up if you are underfeeding. and a salt build up would start from bottom and go up
it also has N in it to help keep em green

BUT, you are so close to finishing that trying to fix it now is pointless.
 
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whitebb2727

Well-Known Member
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