Calcium Def.

I'm thinking I may have a Ca def. these spots have started to appear on about 20% of the older fan leafs. I'm 4 weeks into 12/12.
What do you guys think?

Heap is appreciated!

Unity

looks like magnesium deficentcie,add one tablespoon of epsom salts to a gallon of water,add to plants

Got any more pics??????? What nutes are you using? def. looks like a deficiency. possibly early signs of nute lock out. How bout a little more info?

autotek500 said:

Got any more pics??????? What nutes are you using? def. looks like a deficiency. possibly early signs of nute lock out. How bout a little more info?

Click to expand...

Thanks for your input guys, my grow info is in my sig line. I'm doing a yoga session for another 2 hours, then I check back with some more info.

Thanks for your help!

Unity

If the older leaves are affected first than it means it was a MOBILE nute (One that the plant can reuse by pulling it out of other leaves and bringing them to the new ones; this process is referred to as TRANS LOCATION).

Here are a list of mobile nutes. Nitrogen, Phosphorus, Potassium, Magnesium, Zinc

So if your waters ph is fine check to make sure it is not changing in the soil (mixing with other stuff and viola a new ph.) Or a possible nute lock up due to an overdose of something in the soil, medium, hydro etc. But here we are getting out of my league... Mini scenario : Toxic levels of a Nute or other substance builds up but show little sign (slow), Next thing you know this toxic build up reaches the toxic point, a nute becomes locked out or "unavailable" Than cauing these symptoms to appear quickly... (rapid)

Basically when I say the words "older leaves" and "calcium" I knew I could help somewhat. So Calcium is immobile meaning that the younger leaves would be affected first if there was a deficency or overdose. Check my list above for the possible.

Almost seems that when anything goes wrong it doesn't necessarily be the worst but always so complicated....

dude it is a potassium def. that is the only on that can cause those type of spots on your older leaves. you need lots of potassium phosphorus when going to 12/ 12

elenex7 you might want to find another hobby and leave this up to the people who know what they are talking about....evidently you need to be asking questions instead of answering them.........that was the most uneducated statement i've seen in the last five minutes.....

elenex7,autotek500,buggs bunny
thanks for your input

Here is what I ended up doing ....
So I started to develop a def, I posted about it over in the plant problems area. Small rust spots are developing on some of the older leafs. In would say about 20% of old growth is affected. New growth is fine at the moment.
I do not like to over react to these things any more, so I measured my response,lol.

I do not think it is fungal (at least not in the root zone) since I use h202 from the very beginning of this grow and my res temps are well below 73 at all times.
I do not think it is fungal from the air up top since the way it is spreading is not like fungus or mold spread on a surface when it attacks it.
To me as well as some others it looks like a def. i.e. Mg. Another thing that could cause these symptoms is ozone damage, which is unlikely but possible, I guess. I do not generate ozone in my grow space, but I do run fans, a media type air purifier, a de-humidifier, ac etc. and I'm in a sealed environment, which could cause the ozone levels to spike in the room since I'm not venting during lights on and all electronics do emit some amount of ozone. I have a cycle timer that I will use to vent my sealed room for 1min. every 2 hours during lights on. I think that is a prudent practice no matter if my symptoms are related or not.

-I flushed with a mild nutrient solution (about 450 ppm), which gave me a chance to make sure that all my run-off perimeters are ok.
- I turned my chiller & circulation pump for the res back on (raises my res temps back to 69 from 60 and keeps it constant at 69) I read that uptake problems with certain elements can exist at lower temps. I don't know if that is so, but it is not a big deal to do, so why not!
- I increased my nutes from 6ml/g to 7 ml/g
- Added some silicone for stress relief to my res.
- increased Cal-Mag from 5ml/g to 10ml/g

I'll keep a close Eye on it

Thanks again,
Unity

Hi unity,

Try foliar feeding for a while. If you think the problem is a calcium
deficiency, you can make up your own spray. Take ¼ tsp of lime and
put it in a blender. Pour in 1 cup of distilled water and blend at a high
speed for 1 minute total time. 20 seconds on and 20 seconds off.
Pour the mixture into 1 gallon of distilled water. Add 8 drops of Ultra
Sun Light dishwashing liquid and shake well.

Saturate both sides of the leaves, every other day x2. This will not
correct any existing defects but should prevent any new ones.
If you see no improvement in a week, then you probably have
something else going on.

rob

rob dos said:

Hi unity,

Try foliar feeding for a while. If you think the problem is a calcium
deficiency, you can make up your own spray. Take ¼ tsp of lime and
put it in a blender. Pour in 1 cup of distilled water and blend at a high
speed for 1 minute total time. 20 seconds on and 20 seconds off.
Pour the mixture into 1 gallon of distilled water. Add 8 drops of Ultra
Sun Light dishwashing liquid and shake well.

Saturate both sides of the leaves, every other day x2. This will not
correct any existing defects but should prevent any new ones.
If you see no improvement in a week, then you probably have
something else going on.
rob

Click to expand...

This actually sounds like a plan, I would check it out.

Wet