ı lost 3 set fan leaves from yellowing leaves.it took a time and help realizing that its lack of light.but dont think u will have serious lack of light issue at outdoor.ım on my first grow still a noob..dont tried cloning but ı can say dont skip ur feeding schedule,just feed em and watch for will yellowing jumps the next set.than it seems if you need a supliment of nitro.
best of luck bro..peace