Magnesium deficency, pH problem?

[t0m420]

Hi everyone,
I have this plant in soil which is in its fifth week of vegetative growth and everything was fine until a couple of days ago when, after watering it, it started to develop these burnt and yellowed areas on the medium-high leaves, or in any case mainly those exposed to direct light .
I maintain a ph between 6.3 and 6.5 and use half dose of advanced nutrients ph perfect kit with occasional calcium and magnesium supplements.
the plant is in a 25 liter pot.
if anyone has any idea what the problem is it would really help me because it's getting worse pretty fast.
Thank you.

 

[CaptainLucky]

Hi everyone,
I have this plant in soil which is in its fifth week of vegetative growth and everything was fine until a couple of days ago when, after watering it, it started to develop these burnt and yellowed areas on the medium-high leaves, or in any case mainly those exposed to direct light .
I maintain a ph between 6.3 and 6.5 and use half dose of advanced nutrients ph perfect kit with occasional calcium and magnesium supplements.
the plant is in a 25 liter pot.
if anyone has any idea what the problem is it would really help me because it's getting worse pretty fast.
Thank you.

I’m not sure what you have there but you should check/ google Jorge’s deficiency chart. Hope it helps. CL

 

[Keffka]

Hi everyone,
I have this plant in soil which is in its fifth week of vegetative growth and everything was fine until a couple of days ago when, after watering it, it started to develop these burnt and yellowed areas on the medium-high leaves, or in any case mainly those exposed to direct light .
I maintain a ph between 6.3 and 6.5 and use half dose of advanced nutrients ph perfect kit with occasional calcium and magnesium supplements.
the plant is in a 25 liter pot.
if anyone has any idea what the problem is it would really help me because it's getting worse pretty fast.
Thank you.

I’m gonna tell you the first thing @Emilya Green will tell you. Why are you using a half dose of nutrients? You should be feeding as directed according to the nutrient manufacturers label. What I see is a plant that isn’t being given the proper nutrition which is why you have such conflicting looking issues. You also need to be more consistent with your calmag dosing as well. Follow the directions on the labels.

 

[SmokingWings]

I’m not sure what you have there but you should check/ google Jorge’s deficiency chart. Hope it helps.

Looked at Jorge's excess/deficiency chart and the 3 that jumped out were a deficiency in one or more of Phosphorous, Potassium and Calcium. Just my way of looking at it but I would go with the plant(s) needing Calcium, Potassium and then Phosphorous in that order.

I used to have the same issue with the same color of spots. Eventually I followed the general advice I saw many mentioning here and started using an organic source of Calcium and have never looked back.

I maintain a ph between 6.3 and 6.5 and use half dose of advanced nutrients ph perfect kit with occasional calcium and magnesium supplements.
the plant is in a 25 liter pot.

As @CaptainLucky and @Keffka bring up the 1/2 dose is causing the problem. How often do you include the fertilizing in with the water schedule?

if anyone has any idea what the problem is it would really help me because it's getting worse pretty fast.

Five weeks into a vegetating cycle with a low dose of fertilizer seems about right. The best thing is to adjust the dosage and frequency and help the plant to improve. As long as it is not yet into flowering you should be OK.

But, once the plants start flowering I have found it near impossible to fix these types of problems caused by low doses. The best I could hope for was that the problem stopped getting worse. It only fixed itself if I started the improved feeding schedule while it was still in a vegetating stage.

 

[Phytoplankton]

What are you feeding (%NPK) and how often? Also, what are you growing in (soil, coco,peat)?

 

[Keffka]

What are you feeding (%NPK) and how often? Also, what are you growing in (soil, coco,peat)?

OP said this:

I have this plant in soil

maintain a ph between 6.3 and 6.5 and use half dose of advanced nutrients ph perfect kit with occasional calcium and magnesium supplements.
the plant is in a 25 liter pot