Can any vets help identify this deficiency?


#1

Hey. This is my 2nd grow using a hydro top feed method. Plants have been healthy throughout the veg cycle and I started flowering about a week ago. Just changed the reservoir yesterday and today one single leaf is showing signs of some type of deficiency. I am growing Gold Leaf which is a 60/40 indica hybrid that grows like a sativa (real tall). The problematic leaf is a large fan leaf near the top of the plant and also pretty close to the light. I have ruled out light burn because there are a few higher leaves that look healthy.

pH was about 6.1 when I changed the rez and now has fallen to about 5.9. PPM is a bit high at 1800 so I am adding some pH’d water to bring it down. The leaf is showing clear signs of yellowing (bright) between the veins. Although the leaf is high up, it is not new growth because it is already a very large fan leaf. That is making the forensics harder for me. What is weird is that only this single leaf is showing these symptoms all others look relatively healthy.

My initial thoughts: iron deficiency or magnanese deficiency.

Any help would be appreciated.


#2

Before anyone asks for more info.

Fill out a “Support Ticket”

COPY/PASTE: This “Support Ticket” into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so = NA

ILGM Support Ticket:
What is the strain and type(unknown bag seed, strain name, regular seeds, feminized seeds, auto-flower, etc)?

Indoor or Outdoor? If outdoor, planted

in ground or in a container?

Size of space (max height and area, length/width)?

Soil or Hydro? Type of Medium used? System type?

pH? Of the soil or medium (root zone/reservoir/run-off) and of the water and/or nutrient mix that is fed to the plant?

Type and strength of nutrients used? NPK? EC/TDS/PPM levels? Of what you feed it as well as what is in the water by itself and in the soil/medium (run-off), or reservoir.

Temperature? Day vs. night temp or highest and lowest temps? Root zone temps?

Humidity %? Day vs. night

Light system/watts/lumens/FLUX/PAR?

Ventilation system? Size? CFM? CO2? AC, Humidifier, De-humidifier?

Number “weeks/days” from into Season, Vegetative Growth or
Bloom/flowering?

Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but try to be brief and to the point. Short and to the point questions and/or facts will help us help you


#3

ILGM Support Ticket:
What is the strain and type(unknown bag seed, strain name, regular seeds, feminized seeds, auto-flower, etc)?
Feminized seeds from ILGM: Gold Leaf
Indoor or Outdoor? If outdoor, planted
Indoor in an Apollo tent.
in ground or in a container?
5.5 gallon rez
Size of space (max height and area, length/width)?
Tent is 3x3x6 ft
Soil or Hydro? Type of Medium used? System type?
Top feed DWC Hydro using rapid rooters and hydroton
pH? Of the soil or medium (root zone/reservoir/run-off) and of the water and/or nutrient mix that is fed to the plant?
pH is 5.9
Type and strength of nutrients used? NPK? EC/TDS/PPM levels? Of what you feed it as well as what is in the water by itself and in the soil/medium (run-off), or reservoir.
General Hydroponics trio at 1800ppm (bringing it down now)
Temperature? Day vs. night temp or highest and lowest temps? Root zone temps?
Temps regulated by AC 68-70 at night, 73-76 during day
Humidity %? Day vs. night
Not sure day vs night but fluctuates from high 40s to low 60s
Light system/watts/lumens/FLUX/PAR?
600w HPS
Ventilation system? Size? CFM? CO2? AC, Humidifier, De-humidifier?
240 cfm 6" duct fan, no CO2, Yes AC, Small little de-humidifier inside tent that doesn’t do much
Number “weeks/days” from into Season, Vegetative Growth or
Bloom/flowering?
1 week into flowering, about 7 weeks in veg
Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but try to be brief and to the point. Short and to the point questions and/or facts will help us help you


#4

Forgot to mention I also am using Cali-Magic (Cal-mag supplement) and hydroguard.


#5

Does it look like this ?

? https://discourse-cdn-sjc1.com/business6/uploads/growingmarijuana/original/2X/f/fa4c73d07fd2d80a2e051d63d4589820a4549af1.jpg
..Odd leaf curl

… I’m not saying it is, but it kind of looks like that picture ?
-good luck!


#6

Hey thanks for the link. It does have a bit of a curl to it, but I don’t see any of those specs. It is pretty clean other than the yellowing. It also doesn’t look quite as dark green. I don’t believe it is any type of fungus/mold.


#7

Also the pics in the link show yellowing in the veins, not between the veins like mine.


#8

Yeah you’re right it’s probably totally different

…it’s just looks the same that’s why I wanted to show you the link

…also it started in one leaf at the top like that too…

So it looks the same and started the same, but it’s probably totally different like you say

-best of luck


#9

How far are lights? If a 600w in 6 foot space may tight. Not heat but lumens.


#10

It looks totally different man, not sure what your seeing.


#11

Well I only showed you one leaf, I got plenty I can match for you I suppose ?

… I’m not saying that’s it I’m just saying it’s the same symptoms

…if you start getting more leafs like that you’ve already got a link
-good luck


#12

take a peek here…


#13

Thanks for the link, it’s a lot better than the site I use for forensics. Seems to me to be an iron deficiency since some of the new growth looks a bit pale. I still need to figure out what is causing it though. In the last rez change I gave the plant its first flowering ratio of nutes. Maybe the plant is reacting poorly to the ratio or perhaps I did not properly mix the nutes and have caused some kind of blockage. I am going to flush it and give it a new rez to see if it helps.


#14

I was wondering myself if that’s nutes or beginning of a light burn? Mike

Sorry, I got a better look and now feel it is nutrition. Possibly phosferous