Is this a cal mag issue?

kjiggs

Well-Known Member
I am on week 5 of veg in 4 inch rockwool cubes following the drain to waste feed schedule using current culture nutrients, with .5ML of power.si per gallon. I am repeating week 4 as recommended by the company and I am noticing leaf/stem issues that I believe is magnesium deficiency.
I am feeding 1.2EC / 5.9PH but the run off is 2.8EC / 8.4PH.
75-82 day temp 70-75 night temp, 55% RH
HLG 600R LED light 24 inches from top of canopy


 

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Almost all manufacturer recs for nutrient usage is to high
That looks like what has happened here
New growth will recover
I would run half rec dose from now on
 
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