Calcium/Magnesium deficiency? Week 3 flower

giotto420

giotto420

Member
Hello. I am around week 3 into flowering and have noticed some deficiency starting to appear on my plant - few brown spots are appearing on different leaves (both from the top and from the bottom of the plant), and yellow leaves also started yellowing and are really fragile and crumbly.

I am attaching some photos to help with ID and some info about her below;
  • Soil - Klasmann TS3 Sphagnum Peat Moss/Substrate mixed with some perlite and vermiculite
  • Lights - 20:4 from 300W LED (real 135W)
  • Light distance: ~ 40cm from canopy
  • Water: I am using tap water that as far as I know is considered 'hard water', and has natural pH of around 8+. I use ph down to bring it down to ~ 6.5 before watering
I water as soon as I feel the pot be light and the top of the soil dry (usually happens every 3 days).
  • Exhaust pulling hot air at the top of the tent
  • Age: 7 weeks and 3 days
  • Temps: 21 - 27 Celsius max
  • RH: 45% - 50%
  • Nutes: Biobuzz Bloom (1ml / 1.5L) & Top Max (1mL / 1.5 L) + Fish Mix (0.5 ml / 1.5 L)
Click to expand...
I am also growing another one, which is around 3 weeks old and seems to show similar (?) deficiency as well... also attached photo of her as well.

From the research I have done, it is possible that it is Magnesium deficiency which would be pretty weird as like I mentioned, the water I have should be hard water.

Can anyone help me address this issue?
 

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Takbud

Takbud

Member
Looks like a problem i had a couple years back looks like nute block i would flush plants let them dry out and start back on feeding use like half strength on first feeding and look into lolypopping next grow it will increase your yield happy growing
 
giotto420

giotto420

Member
Hey thanks for the feedback. I don't think nute lock is the issue as I am measuring the runoff water's pH after every watering and it is within the normal ranges (6-6.5). I'll definitely incorporate more techniques for increasing yield after this one but since it is my first grow & and an autoflower, I was avoiding too much stress to it.
 
HydroKid239

HydroKid239

Well-Known Member
giotto420 said:
Hello. I am around week 3 into flowering and have noticed some deficiency starting to appear on my plant - few brown spots are appearing on different leaves (both from the top and from the bottom of the plant), and yellow leaves also started yellowing and are really fragile and crumbly.

I am attaching some photos to help with ID and some info about her below;


I am also growing another one, which is around 3 weeks old and seems to show similar (?) deficiency as well... also attached photo of her as well.

From the research I have done, it is possible that it is Magnesium deficiency which would be pretty weird as like I mentioned, the water I have should be hard water.

Can anyone help me address this issue?
Click to expand...
Klasmann TS3 Sphagnum Peat Moss with aeration I believe should be getting a lower ph’d feed. 5.8-6.2. They are probably having issues up taking the food given. Which means it could be building up. A flush doesn’t sound like a bad idea to get it back on track with the correct ph.
That’s my guess. I could be wrong.
 
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