Need Help Asap

Here is some pics of my plants outdoor on my deck.


I have Brown patches forming on the bottom leaves of my plants and it is getting worse.

i need advice on what the problem might me.

currently have indica strains. total of 16 plants all between 6-9 weeks old in 2 g pots outdoors. soil could have been better as it was from my garden that i never grew in but soil was a year or more old.

i figured that if the soil was shit they would not have gotten this far.


THANKS EVERYONE

Hey, I thot that first but it started on other plants on top leaves so it has to be somthing else. Also I very careful about splashes