P or K deficiency?
- Thread starter mobutu202
- Start date
I think it's K def or needs higher ppm, but others here know a lot more than me. A picture of the plant would help. Is this on new growth or old? BTW, what book is that?
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Wastei
Well-Known Member
915ppm / 1.83 EC is way high in veg, especially in DWC.
I'm at 300ppm / 0.6 EC at that point.
It's not that Mg, P or K is missing from the formula, it's not accessible to the plant. Overfeeding in DWC will most often create a more reactive solution in terms of pH fluctuations. You want to aim for the lowest optimal nutrient strength and dial in from there.
How long was it and how often do you calibrate your pH pen? Do you keep it in a buffer solution? pH is probably off, it's almost impossible that it's a low P or K related issue since it's in very low demand in veg.
How often do you do reservoir changes? Every 10-14 days? ppm/ EC readings will be off on the total after two weeks with a lot of acids and residues given of from the plants roots. That's one of the main reasons to do regular reservoir changes, that and staying on top of pathogens by keeping everything clean.
Most common issue starting out is using excess light which cause all sorts of deficiencies starting with K, Mg and Ca.
I'm at 300ppm / 0.6 EC at that point.
It's not that Mg, P or K is missing from the formula, it's not accessible to the plant. Overfeeding in DWC will most often create a more reactive solution in terms of pH fluctuations. You want to aim for the lowest optimal nutrient strength and dial in from there.
How long was it and how often do you calibrate your pH pen? Do you keep it in a buffer solution? pH is probably off, it's almost impossible that it's a low P or K related issue since it's in very low demand in veg.
How often do you do reservoir changes? Every 10-14 days? ppm/ EC readings will be off on the total after two weeks with a lot of acids and residues given of from the plants roots. That's one of the main reasons to do regular reservoir changes, that and staying on top of pathogens by keeping everything clean.
Most common issue starting out is using excess light which cause all sorts of deficiencies starting with K, Mg and Ca.
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