Custom45
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Hi all,
Growing a few plants in coco coir, feeding Canna nutes (in week 4.. feeding per 10 litre: 45ml A+B, 25ml Cannazyme, 15ml pk 13/14, 40ml Boost accel, and adding a little TNC Bactorr s13). Temps with lights on 25°c, lights off 20°c. Humidity around 45-55%. Had some browning on leaves and wanted a second opinion on cause. I think it may be light burn.
I'm feeding every other day, each plant is taking about 3 litres. In week 4 of flowering so using pk 13/14. Previously had what I think was potassium deficiency (brown leaf edges and some yellowing) so I started adding a small amount (.3ml per litre) of pk 13/14 in week 2, that seems to have gone away. Also had what seemed to be either nitrogen or manganese deficiency.. lower leaves were yellowing and turning brown. I've been pHing water to around 6.0-6.2, however I checked run off and it came out around 6.3, I read plants take up manganese at slightly lower pH, so lowered to around 5.6 for last few feeds, that seems to have helped, can't see any more leaves turning yellow.
However I've now noticed the brown patches on some top fan leaves. A couple of leaves at first, then a few more, and now even more. It appears to be spreading. Light is a 300w Lumatek Attis led, approx 350mm from plants. Was at 100%, turned down to 80% but problem still getting worse. Think it's too close to the plants. I can raise it, but only by 50mm or so. Is this a light problem and if so whats best course of action? Lower to 60%? I'm worried buds and leaves on plants edges won't then get enough light.
Another thing, I could be wrong, but I'm sure buds have slowed development since I noticed this.
The brown patches look a little yellow in the pictures, but they are browner in real life....
These aren't pollen sacs are they??
Growing a few plants in coco coir, feeding Canna nutes (in week 4.. feeding per 10 litre: 45ml A+B, 25ml Cannazyme, 15ml pk 13/14, 40ml Boost accel, and adding a little TNC Bactorr s13). Temps with lights on 25°c, lights off 20°c. Humidity around 45-55%. Had some browning on leaves and wanted a second opinion on cause. I think it may be light burn.
I'm feeding every other day, each plant is taking about 3 litres. In week 4 of flowering so using pk 13/14. Previously had what I think was potassium deficiency (brown leaf edges and some yellowing) so I started adding a small amount (.3ml per litre) of pk 13/14 in week 2, that seems to have gone away. Also had what seemed to be either nitrogen or manganese deficiency.. lower leaves were yellowing and turning brown. I've been pHing water to around 6.0-6.2, however I checked run off and it came out around 6.3, I read plants take up manganese at slightly lower pH, so lowered to around 5.6 for last few feeds, that seems to have helped, can't see any more leaves turning yellow.
However I've now noticed the brown patches on some top fan leaves. A couple of leaves at first, then a few more, and now even more. It appears to be spreading. Light is a 300w Lumatek Attis led, approx 350mm from plants. Was at 100%, turned down to 80% but problem still getting worse. Think it's too close to the plants. I can raise it, but only by 50mm or so. Is this a light problem and if so whats best course of action? Lower to 60%? I'm worried buds and leaves on plants edges won't then get enough light.
Another thing, I could be wrong, but I'm sure buds have slowed development since I noticed this.
The brown patches look a little yellow in the pictures, but they are browner in real life....
These aren't pollen sacs are they??