Need help identifying deficiency

C

!CORAL!REEFER!

Active Member
Hey everyone I was hoping that someone can help me identify the issue this plant is showing me. The older leaves look droopy and have this appearance of discoloration. I’ve run this cut before and same issue but now I want to perfect this strain and fix this issue.
It’s a Super Boof cross in coco, led and c02.
the new growth is mostly praying and plant seems fine other than these spots.
Any ideas or tips are greatly appreciated!!!!
 

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R

Red Hard Head

Well-Known Member
It appears most like a phosphorus deficiency. However the burnt - excess fert, or necrotic spots - another deficiency, with the yellowing suggest a second nutrient(s) issue. More info needed.
Others gonna want water specs, RH, medium, ferts, amendments etc.
Also a pic of the whole plant as well as the newest growth would help out nailing this fickle lady's feeding.
 
C

!CORAL!REEFER!

Active Member
thanks for chiming in
Red Hard Head said:
It appears most like a phosphorus deficiency. However the burnt - excess fert, or necrotic spots - another deficiency, with the yellowing suggest a second nutrient(s) issue. More info needed.
Others gonna want water specs, RH, medium, ferts, amendments etc.
Also a pic of the whole plant as well as the newest growth would help out nailing this fickle lady's feeding.
Click to expand...
thanks for chiming in!
Tap water with Power si Bloom and Athena Blended. Week 2 at 2.3 EC
RH 50-60%
coco coir
C02 at 650ppm
Gavita 1700’s @ 100%
Foliar spray Athena IPM, stack and power si
 
R

Red Hard Head

Well-Known Member
Did you charge your coco with cal-mag before planting? Check your pHs every now and then. Before mixing and after mixing....Could also be low calcium. Silica products can have high alkaline pHs. Could be doing something with CEC in coco.
Praying tips can mean many things other than normal growth....
 
C

!CORAL!REEFER!

Active Member
I potted them with dry coco 70/30 blend and fed them at 2.1 EC immediately. I haven’t checked this plants run off yet so I’ll check tomorrow morning and get back with you on that.
Lately the PH in my holding tank has been raising daily and takes a lot more ph down to get it right again then usual. I check daily and adjust it as needed. Maybe that’s saying something about the water in this situation?
 
C

!CORAL!REEFER!

Active Member
Red Hard Head said:
Did you charge your coco with cal-mag before planting? Check your pHs every now and then. Before mixing and after mixing....Could also be low calcium. Silica products can have high alkaline pHs. Could be doing something with CEC in coco.
Praying tips can mean many things other than normal growth....
Click to expand...
I ran this exact cut last run and it did the same thing and it’s the only one in the room. Maybe this strain has higher phosphorus needs?
 
C

!CORAL!REEFER!

Active Member
Alright so I got the run off readings and they seemed pretty normal.

Input ec was 2.5
Output EC was 3.7

input ph was 5.8
Output 5.7

output temp was 68 degrees.

entering week 3 today I introduced PK to the mix according to Athena’s program.
 
C

!CORAL!REEFER!

Active Member
I’m gonna flush her asap. Do you think I may need to flush her once a week since she seems to be a light feeder compared to all the others? It’s funny cause she’s the heaviest yielder by far and eats less than the others. I love weed
 
calvin.m16

calvin.m16

Well-Known Member
Athena recommends 3.0 EC start to finish as well as 5-15% runoff each time you reach field capacity between drybacks.
I quit using their line it was too salty and diluted for my liking, too much filler, I use maxigro 1 EC in veg maxibloom 1.6 EC flower and dont even use runoff anymore. Fuck that. Extremely wasteful and horrible for the environment.
 
C

!CORAL!REEFER!

Active Member
calvin.m16 said:
Athena recommends 3.0 EC start to finish as well as 5-15% runoff each time you reach field capacity between drybacks.
I quit using their line it was too salty and diluted for my liking, too much filler, I use maxigro 1 EC in veg maxibloom 1.6 EC flower and dont even use runoff anymore. Fuck that. Extremely wasteful and horrible for the environment.
Click to expand...
Yeah it’s a lot of water use it took some getting used to when I switched to coco and Athena a couple years ago. I’ve been having great results with the blended line and have no complaints personally
 
calvin.m16

calvin.m16

Well-Known Member
!CORAL!REEFER! said:
Yeah it’s a lot of water use it took some getting used to when I switched to coco and Athena a couple years ago. I’ve been having great results with the blended line and have no complaints personally
Click to expand...
Yup, just need to maybe experiment with a few plants and just feed them without runoff and lower EC to see if things can work without runoff. I dialed in my feeds where I can feed without runoff and have success. I follow General Hydroponics lighter feed guidelines and it works out great. I feed plants less/more based on how they look and try to not change my EC by more than 0.2 per/day when increasing or decreasing feed strengths.

It's harder to grow without runoff for sure, but if you can dial it in, the money you save on flood trays/tables/fertilizer/plumbing is crazy.
 
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