Indoor Unsure as to what's going on!

[FunkyBuddha]

Hey everyone!

All my ladies are 70 days old today, but 2 out of 7 are showing these symptoms. As you can see the leaves have brown spots and are curling upwards a bit, but there's only a few leaves on the two affected plants. I'm growing in 11.5L pots (with drainage of course) in Plagron Terra Lightmix and I'm using the Plagron Terra nutes (bloom 4ml, pure zym 1ml, and green sensations 1ml).

The average temperature is between 20 and 26 degrees Celcius, and humidity swings between 35-55%. I water only when the soil is dry (I weigh by weight and by feeling the soil with my finger about half an inch to an inch deep) and I give 1L per plant. I pH my water with concentrated lemon juice to 6.3-6.8. I'm using a Spectrabox Pro 5 270 (173 actual watt output).

I was thinking of flushing the affected ladies when the soil's dry enough, and measuring the pH of the runoff to see what pH the soil's at. I thought it was a CalMag issue at first, but since the affected leaves are higher up in the plants it doesn't make sense since they're mobile nutrients and I couldn't find anything definitive, but now I'm thinking it may be a pH related issue? I've ordered a bottle of BAC CalMag just in case it's a CalMag deficiency, but I'd love to hear you guys' input!

 

[DirtDiggler]

Just a guess here but maybe a dry spot in your pot when watering?

Are all of your your ladies the same strain? We’re they all started at the same time?

 

[Sleeper143]

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Hey everyone!

All my ladies are 70 days old today, but 2 out of 7 are showing these symptoms. As you can see the leaves have brown spots and are curling upwards a bit, but there's only a few leaves on the two affected plants. I'm growing in 11.5L pots (with drainage of course) in Plagron Terra Lightmix and I'm using the Plagron Terra nutes (bloom 4ml, pure zym 1ml, and green sensations 1ml).

The average temperature is between 20 and 26 degrees Celcius, and humidity swings between 35-55%. I water only when the soil is dry (I weigh by weight and by feeling the soil with my finger about half an inch to an inch deep) and I give 1L per plant. I pH my water with concentrated lemon juice to 6.3-6.8. I'm using a Spectrabox Pro 5 270 (173 actual watt output).

I was thinking of flushing the affected ladies when the soil's dry enough, and measuring the pH of the runoff to see what pH the soil's at. I thought it was a CalMag issue at first, but since the affected leaves are higher up in the plants it doesn't make sense since they're mobile nutrients and I couldn't find anything definitive, but now I'm thinking it may be a pH related issue? I've ordered a bottle of BAC CalMag just in case it's a CalMag deficiency, but I'd love to hear you guys' input!

Calcium is immobile BUT Magnesium is mobile, so it could be an Mg issue

 

[FunkyBuddha]

Just a guess here but maybe a dry spot in your pot when watering?

Are all of your your ladies the same strain? We’re they all started at the same time?

3 of the ladies in the 11.5L pots are LSD autos from Barney's Farm, and then 1 is a Glue Gelato, and then the 3 ladies in the small black pots are 2x Jack Herer and 1x Blueberry. I make sure that every bit of the soil is wet when I water because it triggers the hell out of me when everything else is nice and moist and there's some crusty dry spot in the soil.

 

[FunkyBuddha]

Calcium is immobile BUT Magnesium is mobile, so it could be an Mg issue

Thanks for the response! My CalMag was shipped today, so hopefully it'll be here by Monday or Tuesday at the latest.

 

[Japonica]

I think is cal mag def maybe a bit ph problem too.water with enough (soft)cal mag solution to get ri se any salts

 

[Waira]

-- that dosage, is it normal strength or dilute, and is that per L or gal?... Point is if this is too weak of a feed or not...
Mg is mobile, Ca is not... typically Ca defc. hits mid to upper leaves first, but this isn't a Ca or Mg defc., it looks like a micronute defc,....
pH of the solution is one thing, in-pot pH is another and one does not reflect the other... you'll need a good soil pH probe for such readings, not a cheap one, they are lousy!

 

[FunkyBuddha]

-- that dosage, is it normal strength or dilute, and is that per L or gal?... Point is if this is too weak of a feed or not...
Mg is mobile, Ca is not... typically Ca defc. hits mid to upper leaves first, but this isn't a Ca or Mg defc., it looks like a micronute defc,....
pH of the solution is one thing, in-pot pH is another and one does not reflect the other... you'll need a good soil pH probe for such readings, not a cheap one, they are lousy!

I'm a European fella so it's all in liters and ml. I give 4ml of bloom feed (1ml less than the max recommended dosage) per liter per plant. My CalMag should be hitting the mail tomorrow, so I'll give the affected ladies another flush with just pH-'d water and CalMag. They've still been showing symptoms, but they've slowed down significantly.