Help with deficiency identification (pics included).

Method: DWC, plant in bubbled water.
pH: pH indicator doesn't go below 6.0, so I am sure it is at least 6.0 or lower.
Temperature: 25 deg celcius
Nutes: Using tomato food fertiliser at half strength, added with a tablespoon of Epsom salts for an 8 litre bucket.
Stage of growth: Still running 24/7 lights, about 3 months old.

Notes: Previously had a nitrogen deficiency, growth was stunted and plant was yellow - corrected with increased nutes, plant shot up (and is still growing) however yellow discoloration persisted. Possibly Iron, or Nitrogen deficiency, or Magnesium lockout.

Thanks guys, your help is greatly appreciated.

Mg and Ca try adding cal-mag or get some nutrients that are full spectrum and for hydro


Important Elements
Potassium (K)
Nitrogen (N)
Calcium (Ca)
Phosphorus (P)
Sulfur (S)
Magnesium (Mg)
Iron (Fe)
Manganese (Mn)
Zinc (Zn)
Chlorine (Cl)
Copper (Cu)
Boron (B)
Molybdenum (Mo)
Cobalt (Co)

I would double check the accuracy of your pH pen. Looks like you have the start of a zinc deficiency which is usually caused by too high a pH.

i don't think it is zinc but your pH could be causing problem

just give them a good does of nutes a time or two. its most likely an n def. as u mentioned yellow leaves and its veggin

Despite what some previous posts said, that doesn't look like a calcium, magnesium, or zinc deficiency to me. Looks more like potassium deficiency. This happens when your soil pH gets too low so I'd recommend adding some wood ashes because they will bring that pH up to an appropriate level. I'd also recommend jacks classic 20-20-20 fertilizer although that tomato fertilizer should also work well for a potassium deficiency. DEFINITELY stop using the salts because soil too high in salt is a leading cause of potassium deficiency and pH problems.

Lol he's In dwc not soil read...

jaygrowster said:

Lol he's In dwc not soil read...

Click to expand...

Shit definitely didn't notice that... Should have read a bit more before posting a response but still, it does look like a pH problem leading to potassium deficiency. Potassium gets locked out of DWC systems at ph levels 4-4.5 and 6-6.5 so try and keep your pH between 4.7-5.3. I also don't personally agree with keeping plants on a 24/7 light schedule. Plants need their rest.

i think i see purple vein and on the leaves and stems that mag def. could be caused do to the high ph shot for the middle 5s look a littler pale also looks like nit.def all could be do to nute lock out because of high ph. clean total sysem ph 5.4 water run that in system for a day then on second day add your nutes with micro nutes and keep ph 5.4

Thanks guys, definitely think it's a problem with the pH levels. Will try to adjust it and let you know!