Help some leaves are brown and look "burnt"

Thread starter #1
Hey guys,

I'm new here..... I have 2 plants, home growing, mostly on natural sunlight, no tricks, one seems alright but the other has some brown and burned leaves, in random areas, not particularly bottom or top (maybe a little more on the lower part) , I only water them and put some organic fertilizer... What could it be?

I'll try to attach pic....
 
Thread starter #2
Hey guys,

I'm new here..... I have 2 plants, home growing, mostly on natural sunlight, no tricks, one seems alright but the other has some brown and burned leaves, in random areas, not particularly bottom or top (maybe a little more on the lower part) , I only water them and put some organic fertilizer... What could it be?

I'll try to attach pic....
 
I'm not an expert but lack Of phosphorus is what I would think. A little guano 0-10-0 of super swell 0-7-0 won't bring back your leaves but will stop the progression and help new growth. I brew these for about 2 days in a tea, but any organic fertilizer high in phosphorus will help.