One of my plants has browning on larger leaves

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oill

Well-Known Member
Room is running big pots dtw hydro in rockwool chippings. Its end of week 3 since the flip to 12/12.

Ph is 6
Ec is currently about 1.1 (I lowered it.)
Water temp is about 19c

Room temp humidity... see images.

Got some browning on leaves... any ideas?

I figured this one might have a salt build up so I have lowered the ec by adding some water to the res. I have also been giving this one extra nutes to try and make sure the medium is flushed.
 

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O

oill

Well-Known Member
CannaCountry said:
Can you state its NPK ratios? I can't seem to find them on the label.
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CannaCountry said:
See if you can determine how much Potassium you're working with.
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Heya, sooo....
A
Nk 5 5
B
Pk 4 6

And I'm doing 50/50

So it should be...
Npk 5:4:11 assuming a and b are the same overall strength. A is the one that pushes the ec up... b doesn't seem to that much.

Why what's your hypothesis? Potassium overdose?
 
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CannaCountry

Well-Known Member
My thoughts would lean towards not enough...considering your leaves. Perhaps others will agree...or not. What do you think; if you go look at potassium deficiency in cannabis?
 
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oill

Well-Known Member
CannaCountry said:
My thoughts would lean towards not enough...considering your leaves. Perhaps others will agree...or not. What do you think; if you go look at potassium deficiency in cannabis?
Click to expand...
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Deficiency and excess of Potassium in cannabis plants

In this post we are going to show you how you can detect a deficiency or excess of potassium in cannabis plants to have a problem-free crop and always harvest the best possible quality. Discover everything you need to know about this important nutritional element for your plants.
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Well... week 3/4 and coz of this I have been cutting back the strength. My ec has been down to about 1... which is super low. I flshed yesterday and it looks like it's worse... so I agree.

After the flush I set the tank back to ec 1.4 and flushed a load of nutes through that plant. Hoping that she comes back
 
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oill

Well-Known Member
CannaCountry said:
My thoughts would lean towards not enough...considering your leaves. Perhaps others will agree...or not. What do you think; if you go look at potassium deficiency in cannabis?
Click to expand...
Also noticed my ph rising... lowering it to 5.8 in the hope to increase uptake of k
 
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oill

Well-Known Member
Update....

These 2 pics are taken a few days apart. It looks like the progress of the issue has slowed down.

I have ramped up ec to 1.4 and 1.6... partially coz the other 3 plants are taking it well.

Will increase calmag too later today, but the base notes also have these in, so should already be helping.
 

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