Hello, I'm new to this forum but have been growing for a while but am not able to fix this issue permanently. I have a yellowing of fan leaves problem that started about 2-3 weeks into flower on one plant only. We're now into week 5-6 and have been feeding regularly but can't seem to halt the progression on this one plant. Now a plant next it is showing the same symptoms but not as pronounced. Seems to be happening from the middle of a budded branch and works it's way up. All branches on this plant are effected. After feeding the progression seems to slow down but then picks back up after 5-6 days, yellowing more leaves up the budded branch. Hopefully the pictures will help identify the prob. The first pic is of 3 plants, with the affected plant being in the middle. the other pics are close-ups of the symptom. Here are the specs of my grow: 6 - Grand Daddy Purple in 8'x14' space. Outdoors in the ground in granite based soil. Chicken manure, local Bat Guano, and Bone meal added to holes before planting. During Veg: Local Bat guano, Humboldt Nutrients "Grow" and "Verde" brewed into tea and fed every 7 - 10 days. During Flower: Local Bat Guano, Jamacain Bat Guano, and HN "Grow" and "Bloom" brewed into tea fed every 7 days. Nitrogen deficiency? Sulphur deficiency? Mg deficiency? Should I be worrying with only 4-5 weeks left for flowering?