magnesium deficiency in new growth?

he yall
growing a bunch of different strains but two of my ladies are having what seems to be a magnesium deficiency but only at the top leaves. grown in promix hp, fed gh full line under hlg 550 v2. if not magnesium what else could it be

Newer growth, could be light burn, mag is usually lower older growth. I’m a hps person but how far away is your light, is this plant under the spectrum more? Maybe a led guy will chime in, assuming 550 is wall watts and that’s more then enough to burn, I could be wrong as well but check out that route... bed time.

viper564 said:

he yall
growing a bunch of different strains but two of my ladies are having what seems to be a magnesium deficiency but only at the top leaves. grown in promix hp, fed gh full line under hlg 550 v2. if not magnesium what else could it be

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Usually any issues with top growth signifies light problems. But that doesn’t look like light problems. Are you feeding any calmag? I grow in promix myself, plants hate it when I don’t use calmag, even though I use tap water.

LED's have been known to cause Mg issues....and that is what it looks like you have. Epson salt is your friend in this case. Good luck.

im going to do both things i drop the intesity of light down and getting epsom salt tomorrow. how much per gallon. also how would a light type cause different issues

viper564 said:

im going to do both things i drop the intesity of light down and getting epsom salt tomorrow. how much per gallon. also how would a light type cause different issues

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One tablespoon of Epsom Salt per gallon of water is very common.

viper564 said:

im going to do both things i drop the intesity of light down and getting epsom salt tomorrow. how much per gallon. also how would a light type cause different issues

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Not sure on light, I use a tsp per gallon of salt like mentioned and a little less for foliage feeding, I do both at the same time at signs of def, not sure if it makes a difference but they always recover well.