Yellow leaves

Hi new to this site, on my first couple weeks of flowering and noticed quite a few leaves dying can't quite diagnose myself can any you guys help thanks in advance

Phos, or mag def.

Thanks I've been stuggling for the past week is there a additives you can buy to put to your feed?

what line of nutes are you using at the moment, and at what doses(per gallon)? you burned them up with something for sure.

I've maybe nute burn so I gave them a flush , now back on 25ml a&b 20ml rhyzotonic 20ml boost , on other leaves there are few burnt tips but theses leaves look somthing totally diffrent

spam knackers said:

I've maybe nute burn so I gave them a flush , now back on 25ml a&b 20ml rhyzotonic 20ml boost , on other leaves there are few burnt tips but theses leaves look somthing totally diffrent

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its a phosphorus burn, cut down your nutes to 15ml per gallon. you just want the nutes to be present in your soil for the roots to take in, giving them full doses doesnt really make that much of a change,especially the boost. burnt tips is an indicator that youre using a strong dosage of nutes. goodluck man. stay lifted.

also get a source of cal and magn. any kind of cal-mg is always good. use that at recommended dosage.

Sorry my dosage on nutes is to 10 litres so I'm ok on that side going out to get some cal-magn , thanks for the response , was going to bin them and start over