Hey All, I am 3 weeks into flower with Blue Widow growing in RDWC. I have been running Lucas in the past and kept getting spots like you see below. I have tried a number of changes on successive crops and thought that I finally had it worked out. Everything was looking perfect until a few days ago and the spots are showing up. Setup: 12/12 under HPS RDWC running Snype's nute regimen. Similar to Lucas but with a 1:1.5 ratio instead of 1:2 and adding KoolBloom 1.25gm/gal at day 14 flower. PH 5.8-6.1 TDS 700 (.5 scale) My PH sat solid at 6.0 for quite some time. Air temps: 68-75F RH: 50-65% The affected leaves were just upper fan leaves to start with. Now I am seeing some sign of the same on the very lowest fan leaves. The symptoms look to me like either Phosphorus or Calcium deficiency. In the past I have added CalMag when I started seeing these spots. No change with the CalMag. That led me to believe that it may be a Phosphorous deficiency. With the switch in nute regimen I though I had it resolved. The addition of KoolBloom hits the K & P pretty hard. Unfortunately I am seeing spots again...... Take a look at the pics and let me know what you think? Is it Phophorous? Calcium? Could I be locking Calcium out at PH 6.0-6.1?? What do you all think?
According to this chart, you're on the low end of a lock-out on P and K when you're in the drift @ 6.1 Steady the ph for improvement. http://boards.cannabis.com/attachments/plant-problems/281235d1325194867-brown-spots-some-twisted-leaves-some-tips-curled-down-phchart.jpg
Hey Mman, Thanks for the input. I hold pretty steady at 6.0 with swings running 5.8-6.1 PH. I am not seeing "twisted" leaves but the worst of the fan leaves do have a "taco" appearance. I am going to drop my "target" PH down a bit and see where that takes me. I wouldn't have expected a difference of around .1-.2 would be that significant. Thanks FJ.
The absence of spider mites, larvae or webs. I have checked thoroughly with naked eye and dissection microscope (80x). Good thought though. The symptoms have some similarity to spider mite damage. Any other thoughts? Thanks FJ
Holding PH @ 5.8 and have added additional P & K. I see a gradual progression in the fan leaves showing the same appearance as the first picture above (100_1088.jpg) and am having to prop up a few branches already. Otherwise the plants look healthy. Thoughts? Thanks FJ.
I have 3 pH meters 4 TDS meters. I cross check readings between meters periodically and calibrate every 2 weeks .
RO. I made a run to the grow store yesterday for CalMag. 150+ mile round trip. Spent more at the gas station than the grow shop... We'll see how that goes. CalMag did not resolve the issue last time I saw it but I was also having PH issues on that run. This time PH & TDS have been very stable & "well behaved".
Could very well be your issue, since your using RO water. I'm sorry you had to go so far, you must live in the wilderness like I do, only my best outlets are Ebay and Amazon.
And you did modify your nute regimen, that could make a slight difference. We'll stay on top of things and see how they go.
I did add the KoolBloom and CalMag. As far as I can tell this has halted the progression of the yellowing. Sometimes it is tough when you see them every day to tell "is it better or worse than yesterday?". After a few days I think I can sat that it is not getting worse. Here are some plant pics. The lighting makes the pics look more yellow than the plants really are.
I am having a similar problem. I am pretty sure it's a magnesium deficiency or a Cal lockout. From what I am reading, spraying with water that has Epsom salts dissolved in it should do the trick. A top per 32 liters is the desired amount. Gonna try this tomorrow. Sent from my Galaxy Note II. I know you bitchez be jealous.