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pH questions

Yeah full fledged, im in 7 gallon pots. Ill be running 6 gallons R/O through each pot. Probably pH it at 6.4 or 6.5 to get the right pH zone.

I dont think i could get a mat under the 4 plants, but I think root zone temps should be okay. They are on 2 inch risers to keep them off the ground and the tent temp at canopy is 78 ish. Below the canopy in the shade around the pots is like 71 ish.

But my oscillating fan was very close to the worst effected plant. Blowing right on the pot. That could have made it colder a bit colder.
 
Well after the flush let it dry out a little before putting it back in the tent to try to lower the humidity too just to be safe
 
Yeah the were fine through the coldest part of the winter we are thawing pretty quickly now. Stupid Michigan weather.

Thats exactly what ill do. Probably open the tent 15-20 mins early one day and flush right before lights on outside the tent then throw them back in after drying a bit.
 
Through process of elimination I have got it down to 2 things.

1) Nitrogen deficiency or lockout. Leaves are yellowing and dying off bottom up. There is wilting and falling off as well, could be this.

2) Phosphorus Deficiency, Leaves are yellowing bottom up. The leaves do have a shiny coat on them and they feel crispy.. Also the two worst effected plants also have dark red/purple stems (unfortunately both strains are purple naturally and I do not know if the purple stems are strain related or the deficiency.)

You can see how dark the stems are in the pics. Gonna flush and see what happens. Hope its a lockout and not just a deficiency wont be able to give food for over a week after the flush. Hopefully she doesnt die on me.
 

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Flushed the first plant tonight with 5 gallons of pH'd water at 6.5. I checked runoff at 2 stages. 1st amount of runoff tested at 6.5 runoff with 656 ppm. The second part of the runoff was also at 6.5 pH but ppm was only 420 ppm.

So with this info would you assume deficiency over lockout?

If it is a deficiency should I up my food for the other plants showing this next feed?

If its lockout I will flush the rest if the plants with the same method.
 
I was thinking that too. But if im in a lockout situation more nutes will just hurt, this has me hesitant. I did feed 1350 ppm but 4 days ago.

Maybe tomorrow I will just feed the other plant showing the next most issues. Up the nutes a hit and compare the twos reactions.
 
I sure don't think it's lockout, if you are even close to the right number, your ok .
If those leaves are dying an falling off thats a nitrogen shortage.
The main thing to remember, is each plant grows differently, an you have to doctor them differently.
 
As Nebula says, and most who are offering help are pointing out, most deficiencies are caused by pH being off. You've done some flushing that will both correct your pH, AND strip away a lot of nutes. It may be that your pH is getting there, but there might not be enough nutrients left in the soil, or not in the right proportions.
 
You sure the plants not just using the good stuff in those leaves UrbZ ? Plants start to use stuff in the leaves near the end of there life cycle and you get dieing from the bottom up. How many days in flower so far ?
 
So we shall see. I fed one of the other plants today instead of flushing. I upped the food to 3/4 strength and added some extra p-k for good measures. PPM was at 1700!

Now just to watch each plants reaction, to see which one helps.

Im hoping to hold of on the other two plants a bit until I see which one helps more.

So if the extra food does help, can I feed the other plants again even if they were fed with nutes last time and not just water? Or should I still do a water only then back to nutes?
 
Yes, but only if they look like they might be having some deficiency going on, and you have your pH under control. Each plant might have different needs, even individual plants from seeds of the same strain may want different nute levels.

But it might be a good idea to keep the nutes on the lighter side, like 1/2 strength. That way, if it's not the right solution to the problem, you will be less likely to create new problems.
 
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