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is this magnesium or phosphorus deficiency?

ph at 6.3

ec at 1.2

week 2 flower

run off 6.3 ph

run off ec is 3

 

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      • Looks pretty good to me. Be careful with bloom boosters. P and K can lock out Ca. and Mg.  A phosphorus excess can cause a massive nutrient lockout of other elements like calcium, copper, iron, magnesium and zinc1Too much phosphorus can actually cause nutrient deficiencies of other minerals like calcium or magnesium, and eventually kill your cannabis plants2Two nutrients that are particularly vulnerable to lockout are calcium and magnesium3. One thing to remember about P is that is stays in your media for quite a while and doesn't leach out very much. I'd slow down on ferts for a week or two . Peace

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        • Do you fluctuate your ph at all?

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          • yes at 6.3

             

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          • How much cal mag are you giving them?

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            • once a week

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              • How many ml per gallon? I was doing once a week as well on the days they did not get nutes I gave them cal mag had to go to every time the soil gets wet they get cal mag and increased it to 7ml per gallon. Don’t think you can overdo it with cal mag

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