Can't identify what is wrong with my plant

[recky]

Hi everyone
It is currently week 3 of flowering for my two autoflower. I'm Having some problems with fan leaves crinkling up, turning brown and curling in on themselves. Think it may be light burn but not sure. Growing under a 600 watt hps light. Humidity steadily at 51 percent and temperature at 26 degrees Celsius. Thanks a lot!

 

[Emilya Green]

magnesium deficiency... these plants are magnesium hogs. Get or make some calmag+ to add to your nute regimen. While you are waiting for that to arrive, a foliar spray of epsom salt solution once a day will act as a band-aid to stop the progression. Don't get the epsom SALT in the soil.

 

[recky]

thank's a lot mate. got some cal mag x and seem's to be doing better already!