G
gordonian
- 6
- 3
So I have a some grape kush that is in week 3 of flower. All the leaves in the upper third of the plant are yellowing starting at the leaf tip working its way back. . I am in coco 2 gallon pots feeding 1500ml 3 times a day with roughly 20% runoff. room is 78 degrees with 62% RH. nights are running about 5 degrees cooler. Mills nutrients ph to 5.85 E.C. 1.6. Lights are 4 feet off canopy. I did a slurry test and P.H. was 5.8, but with a blue lab soil ph probe the pots were reading 5.3-5.7., not sure which is accurate. Any ideas what it might be?