Day 40 Auto Amnesia "Rust" On Leaves

[Teuffelhound]

What ph meter are you using? Has it been calibrated lately?

Extech ExStik EC500 calibrated each week.

 

[Teuffelhound]

Thank you @Suki813 for your responses. I have a (non-amended) 5 gallon bucket of water that has been sitting for a day. I'll pH this water to 6.5 and give a gallon to each and see how they respond. Again, thank you for your time.

 

[Suki]

Do the reports list Ca or hardness anywhere? @Bruce Campbell and @Mañ'O'Green may be able to help you better.

 

[Mañ'O'Green]

OMG 4g of Epsom Salt per gallon is WAY TO MUCH!

Your plants are showing signs of K lock-out

You probably need ZERO to begin with in OF/HF.

There is nothing you can do at this point. OF/HF do not respond well to flushing it will make matters worse if that is possible? I am not sure these will survive? Live and learn.

PH your fertilizer blend to 6.4 for HF/OF.


Layering soil is not a good idea. a cannabis tap root can grow 9 inches in 3 days so it is in the bottom of the pot before you know it.

So For your next grow you need a few tools and some more information. Get a good EC meter. measuring ml/l of fertilizer is meaningless. You need to know the strength in PPM.

Look at your water reports in the hardness section to determine the amount of Ca and Mg you are starting with.

Learn about balanced Nutrients here:

Tutorial - A word on Nutrients

The proper use of “salt” based fertilizer to grow Auto Flowering Cannabis. Salts: Natural and man made any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation. Learning how to use salt based...

www.autoflower.org

 

[Teuffelhound]

Do the reports list Ca or hardness anywhere? @Bruce Campbell and @Mañ'O'Green may be able to help you better.

Hardness runs about 20ppm and a conductivity of 70-100 is typical for our area. Unfortunately I don’t know the calcium.

 

[Teuffelhound]

OMG 4g of Epsom Salt per gallon is WAY TO MUCH!

Your plants are showing signs of K lock-out

View attachment 1392463

You probably need ZERO to begin with in OF/HF.

There is nothing you can do at this point. OF/HF do not respond well to flushing it will make matters worse if that is possible? I am not sure these will survive? Live and learn.

PH your fertilizer blend to 6.4 for HF/OF.


Layering soil is not a good idea. a cannabis tap root can grow 9 inches in 3 days so it is in the bottom of the pot before you know it.

So For your next grow you need a few tools and some more information. Get a good EC meter. measuring ml/l of fertilizer is meaningless. You need to know the strength in PPM.

Look at your water reports in the hardness section to determine the amount of Ca and Mg you are starting with.

Learn about balanced Nutrients here:

Tutorial - A word on Nutrients

The proper use of “salt” based fertilizer to grow Auto Flowering Cannabis. Salts: Natural and man made any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation. Learning how to use salt based...

www.autoflower.org

Thanks @Mañ'O'Green. Am I looking at a slow death here?

 

[Peacefulgarden]

Whenever I’ve grown in ‘soil’, using salt nutes, treating it like hydro has done well for me. I would just use 1 bottle of grow, bloom or general purpose nutes at ~700 ppm /~ 1.3 ec once the soil itself ~ran out. I used 5.8 ph tap water, don’t know the ph of my soil at the time. Good chance it was OF as well

I can’t imagine needing Epsom salts along a nute for cannabis and like the chart above says, without actually saying it, you would need a soil test to even know if your soil needed it, and if it doesn’t, all it’s gonna do is throw everything outta wack. Any decent salt nute has everything in it that the plant needs imo

if you can test the ph of your soil that would also be a good thing to know.

 

[Peacefulgarden]

Thanks @Mañ'O'Green. Am I looking at a slow death here?

I personally would just flush with what I said above or a bit lower until runoff 1.3 ec or less, you could also see the ph and maybe get an idea if it’s to far off, but I think just to much salts in the soil. I wouldn’t use molasses in a salt grow

Just my opinion. Keep it simple, less is more

if you are going to flush, wait till the plant needs normal watering, to avoid over watering on top of other problems, it could be bad

I’m not Mañ'O'Green, in case you didn’t notice.

 

[Mañ'O'Green]

Thanks @Mañ'O'Green. Am I looking at a slow death here?

Well these plants are unbelievably hardy so they may flower and finish but they will never be what they could have been. Stop feeding Epsom or Cal-Mag. Read about balanced nutrients and feed that once a week.




@Peacefulgarden The problem with flushing soil that has been pre-amended is that it washes out the salts that are water soluble and leaves everything else behind. You end up with a soil that is just as out of balance as it was before just with different unknown elements remaining. I have worked with many many growers in this situation with OF/HF and we have never been able to get the balance back in the soil before the end of the plants life. Autos are on a pre-set clock. There just is not much you can do in such a short period of time.

Run-off is not a good measure of anything. Even PH in the run-off can be way off from what is in the root zone of the plant where it counts. In order to get solid PH information in soil you can take several samples from different depths in the pot and do a slurry test. Once again this is only accurate to the point that you do a competent test? The better method is to use a good soil probe. Accurate 8 or the clone will do a good job or an expensive Blue Lab Leap soil probe. I use the LEAP in my rock wool. Don't buy cheap probes they simply do not work.

 

[Teuffelhound]

Just my opinion. Keep it simple, less is more

Never a truer word spoken...