whats goin on here?

[downtimej]

For the longest time i keep getting these rust spots that gradually turn the leaves yellow and drop. It happens between the 4-6 wk of bud,sometimes worse and sometimes not so bad. Buds turn out good, but just doesnt seem right. I grow in 5g warrior pots with promix hp ph@ 5.5-5.9 using the flora nova lineup feeding at every other watering and adding a little calmag during watering cycle. The room is well ventilated and circulated @81* and 40%rh (lights on) and 68* and 44 % rh (lights off) this is really starting to bother me. Ive been told before that this is considered natural die-off of the plant, but most gardens ive seen stay a little lusher a bit longer than these. At this point any help would be greatly appreciated, thanks.

 

[NuttyProfessor]

looks like calcium and mag ... led lights ??

 

[downtimej]

4- 1k hps in a 12x12 room..

 

[downtimej]

City water that reads at 260ppm average. I add calmag on the plain water cycle at 5ml/gallon, but only 2-3 times during the whole grow..

 

[downtimej]

 

[lushgreen]

Are you growing in soil or something else like coco?
They look like that could use some calmag and some nitrogen as well... Looks like your plants have just finished the stretching, they use up heaps of nitro during this period.

Check out this post for some great info about deficiencies: Cannabis Plant and Pest Problem Solver - Pictorial

 

[downtimej]

Great article, im sure ill reference it often. Im gonna recheck my ph levels in the morning and try more calmag.