Recurring deficiency

[BillyWu]

Hi everyone, been a long time since I posted here!
After recently starting up my tent again, I've noticed that I still get a recurring problem. Take a look at the brown leaves on these photos, and here's what my roots look like just for reference (sorry the pictures are so massive!):

Now I'm thinking this is calcium/magnesium deficiency, so I added approximately 10mL extra of CalMag solution to my reservoir and it doesn't seem to have helped that much. Here's some details:

Grow media: DWC hydro, 20l bucket, 20l/min air pump and air stone
EC: 1.87
Nutrients: Advanced Nutrients Grow A+B (about 20mL each), Bloom A+B (about 90mL each), Hammerhead (about 40mL), CalMag (about 15mL added so far), Mycorrhizal inoculate (1 tsp)
pH: Set to 5.8 each day
Strain: Think Different (Dutch Passion), age is about 50 days I think?
Water source: Tap water, dechlorinated (less than 50PPM)
Lights: 250w HPS
Temperatures: 62F (reservoir), about 72 - 80F (tent)

I've recently added a couple of pots of water to the bottom of my tent as I think it's quite dry in there. Could that have an impact?

Can any of you gents offer some advice please on how I can sort this?

 

[namvet25]

Hi everyone, been a long time since I posted here!
After recently starting up my tent again, I've noticed that I still get a recurring problem. Take a look at the brown leaves on these photos, and here's what my roots look like just for reference (sorry the pictures are so massive!):

Now I'm thinking this is calcium/magnesium deficiency, so I added approximately 10mL extra of CalMag solution to my reservoir and it doesn't seem to have helped that much. Here's some details:

Grow media: DWC hydro, 20l bucket, 20l/min air pump and air stone
EC: 1.87
Nutrients: Advanced Nutrients Grow A+B (about 20mL each), Bloom A+B (about 90mL each), Hammerhead (about 40mL), CalMag (about 15mL added so far), Mycorrhizal inoculate (1 tsp)
pH: Set to 5.8 each day
Temperatures: 62F (reservoir), about 72 - 80F (tent)

I've recently added a couple of pots of water to the bottom of my tent as I think it's quite dry in there. Could that have an impact?

Can any of you gents offer some advice please on how I can sort this?

Have you checked for insects?

 

[BillyWu]

I have indeed. There's no insects in there at all that I can see, and the grow space is only big enough for 1 plant really.

 

[Rev. Green Genes]

looks like mites or thrips to me, check underside of leaves for little white bugs.or use a hand microscope to look for eggs, little round white eggs on under leaf surfaces.

 

[BillyWu]

Had a look on some leaves with a 10x lens, couldn't find any thrips or any bugs. Was it spider mites you're referring to? I haven't seen anything flying around my tiny tent either.

 

[Padawan1972]

Had a look on some leaves with a 10x lens, couldn't find any thrips or any bugs. Was it spider mites you're referring to? I haven't seen anything flying around my tiny tent either.

Spider mite reference

 

[BillyWu]

No sign of any from what I saw, I had a look not long ago but it's lights out now I'll check thoroughly tomorrow.
If it isn't mites or thrips, what else could it be?

 

[Padawan1972]

kinda reminds of a phosphorus def. in flower stage

 

[BillyWu]

kinda reminds of a phosphorus def. in flower stage

So if you take a look at my EC and pH and stuff, what would you recommend I do?

 

[Waira]

not bugs for sure,.. this looks mostly like advanced P defc. to me,....or a toxicity issue,... ppm's are a bit high,... Rev GG, what's your take?
get that EC down under 1,5 or less,.... are the nutes looking OK in the bottle?