ottomangrows
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My PH is pretty steady.It's not nute burn and I don't think it's potassium, either. (There may be a touch of nute burn, but it's not your big problem.)
I can't say for sure. Is it possible that your pH fluctuates a lot?
you want to test the ppms and ph of the run off next watering, it looks like it could be a lock out issue. Also if you have it sitting in a reservoir, you want to make sure the pH is what you think it is before it initiate the watering. Somethings can make wild PH swings happen due to The chemical composition and mineral content of the supply water. You might PH at 5.75 the day before and it raises overnightHi All,
I'm a new grower working toward my first harvest of 5 plants. Two are looking ill in the flowering stage. (Other three look fine on same feeding schedule.)
I need a little help from experienced growers on:
- A diagnosis
- How to treat at this stage in the game (if potassium deficiency.)
I am thinking this is either Nute Burn or Potassium Deficiency.
I am going to lower the canna A B nutes to 2 ML per liter of water; .5 ML of Cal Mag per L of Water.
If this is Potassium, how do I adjust (or do I need to add a supplement)?
THANKS IN ADVANCE FOR YOUR GUIDANCE!
THESE ARE NORTHERN LIGHTS AUTOFLOWERS AT 9 WEEKS:
- LIGHTS: 18 inches above plants
- WATERING SCHEDULE: What daily with fertigation until run-off
- WATER PH: 5.75 PH (Coco)
- SOIL: Coco Coir
- NUTES: Canna Coco A B (2.5 ML of each nute - per L of Water)
- OTHER SUPS: Cal-Mag Plus at 1 ML per L of Water
- TEMP: Steady 70
- HUMIDITY: Steady 55
- STATUS: 9 Weeks
- TYPE: Northern Lights - AUTOFLOWER
View attachment 1126055View attachment 1126056
Your PH for cococoir is best at 5.8-6.3 range. Also I have had better luck using epson salts than cal/mag preparations. I have encountered lockout because of high calcium levels in the coco. I make sure my nutrient mix has a good amount of calcium like 7%. Then supplement the mag with the epson salts. Works well for me!!My PH is pretty steady.
I use an automatic fertigation system that waters 5.75 PH (Coco Coir) every morning for 90 seconds (about 20% run-off).
It is a 20 Gallon system that I only have to refill once a week.
I am very curious, because it is only affecting 2 of 5 plants and they are all on the same feed schedule/system.
The two plants affects are a Northern Light and a Blue Dream. I have another Northern Light and Blue Dream doing just fine on the system.
Photone is useless as a light meter. Its more of a toy than a calibrated scientific par measuring device. Light burn is really rarer than new growers realize. The heat from being too close to the light is usually what damages the leaves. Once the leaves surface temperature hits 85F, they cease to grow and go into self preservation from the excessively high leaf surface temperature. The plant can regulate its leaf temps by transpiration of water to cool the leaves. This is why fans for air movement is critical in the tent environment. Remember tent temperature is not leaf surface temperature.Could it be light burn? I couldn’t tell from the pic the condition of lower leaves. It looks like pistils that get the most exposure are white while there are some reddish ones within lower parts of bud. I just downloaded the light measuring app called “Photone”. Has anyone used this app? I wonder how accurate it is?
Resistance to heat also has a lot to do with EC levels in the root zone . Even with run off, EC levels can build up to the point that it causes problems.Photone is useless as a light meter. Its more of a toy than a calibrated scientific par measuring device. Light burn is really rarer than new growers realize. The heat from being too close to the light is usually what damages the leaves. Once the leaves surface temperature hits 85F, they cease to grow and go into self preservation from the excessively high leaf surface temperature. The plant can regulate its leaf temps by transpiration of water to cool the leaves. This is why fans for air movement is critical in the tent environment. Remember tent temperature is not leaf surface temperature.
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