(PICS)Yellow leaf tips, very slow growth, brown spots on old leaves, any idea!

Call me out on this if you want asahp but i swear this is classic pH problems. Runoff at 5.5 and those leaves look pH bad. Seems like your just not getting the pH of the soil up enough still. What can he do to save the grow, needs to pH up real quick imo! Sorry but this is already killing the yeild and worse than this probably stresseing the plants into taking longer to finish and small final swell.

I really feel for you bro, soil companies do soil at pH6.3 and your buggered to begin with, finding like i got to mix lime in with the soil a month before planting. Mag problems seem to follow the high amount of calcium and by then i am nute deficient from flushing and seems like an never ending cycle at the moment. Soil companies suck! I fear you may never get the soil to the right pH dude. How long till finish cause pH can kill a plant pretty quick, loose the fan leaves and it will slow down a lot.

yes i agree this is pH problems that's what I said. I made a little experiment for you OP, I took some RO water and put some biogrow in it, 1300EC (that's a lot). an equivalent EC (which is probably much less food actually, since organics do not measure well in EC and I actually didn't measure the volume I put in, just a few ml in a party cup of water) - would come out pH 5.6-7. but the biogrow comes out 6.4. that's almost perfect for soil.

see, like i thought, organic nutrients seem to be much more soil-friendly in terms of pH buffer, while your hydroponic nutes seem to be buffering your pH way down. So I think if you switch these nutes by biobizz (or MAYBE other soil/organic nutes) it may solve your problem.

KG you had the opposite problem didn't you? pH too high in hydro? or am I wrong?

I recommend coco for both of you. It's much easier to manage pH wise, and very tolerant.

i'm new to this ..but after reading ur posts if u know its your soil, why dont u get an aerogarden
i have seen great success with people and there plants

But isn't coco badly cal/mag deficient? There is no perfect growing medium that i can see. I too have checked how much my biobizz lowers the pH. I add 2/3ml to a litre of water at pH8 and it comes out at pH 6.5. Since my tap water is pH8 and i use bio bizz grow and bloom this works out perfectly for me. Yes the guess work seems easier with organics but as you say the ec is a bit off. I find my biogrow ec's fine its the biobloom that dosen't read. My maxicrop dosen't really affect pH or ec. Epsom salts lowers pH by a small amount too so guess cal/mag would as well. All usefull info for the grower without a pH/ec meter.

dazzled24 said:

i'm new to this ..but after reading ur posts if u know its your soil, why dont u get an aerogarden
i have seen great success with people and there plants

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Some people like soil and both have obvious benifits and disadvantages. Aero gardens can be tricky and require constant care wheras i can leave my plants for few days no problem. A fert problem in soil is slow to manifest, deprive nitrogen in an aerogarden for 4 days and you'll know about it. Soil rocks, pH of it dosen't.

is there something that can test the nitrogen levels in your soil
i use 10/15/10 shultz for my plants

Yes but it is exspensive. 10/15/10 is the wrong NPK but then again couldn't see why it wouldn't work. The best test for nitrogen is if your plant start to look too dark green and starts to burn on the leaf tips!lol!

i got a posting called new 2 growing i got some pics there
i guess my plant is ok with nitrogen cuz its not dark
i use soil soil is the best

doggyd said:

Why do you say probably? If those leaves die off then there will be no leaf to produce bud for that particular node, right! I don't know how this all works yet, Please explain some more too me.

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This is from a plant two weeks into flower, hit some bad pH problems and i chucked it. Before i did i edited some leaf pictures to a thread along with a picture of pH from a book i work from, granted no two deficiencies or plants look the same and my plant looked different to the book picture but the damage from pH was the same, brown spotting, leaf curling, necrotic patches, yellowing to leaf segments. My plant was bad though but it will provide some refrence for you. Should be page 12, last post at the bottom of the page by me, check the pics out-

https://www.rollitup.org/marijuana-plant-problems/437657-soil-runoff-12.html

Kingrow1 said:

But isn't coco badly cal/mag deficient? There is no perfect growing medium that i can see. I too have checked how much my biobizz lowers the pH. I add 2/3ml to a litre of water at pH8 and it comes out at pH 6.5. Since my tap water is pH8 and i use bio bizz grow and bloom this works out perfectly for me. Yes the guess work seems easier with organics but as you say the ec is a bit off. I find my biogrow ec's fine its the biobloom that dosen't read. My maxicrop dosen't really affect pH or ec. Epsom salts lowers pH by a small amount too so guess cal/mag would as well. All usefull info for the grower without a pH/ec meter.

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no, it's not bad at all. i had a bit of mag problem at first, but solved it with a bit of epsom. never came back for all i know. i did have other problems which i'm still not sure about (weak roots, and i never really figuered out the watering issue), but, yeah... people get it really well, esp. with those designated products such as canna etc. so idk. it has good advantages.


so yeah your experiment confirms mine as well i guess. and also demonstrates how you too should just exchange nutrients or something.

Going of organic ferts as i can't ec them, my shop use to sell coco but they have stopped now, i would like to mix it in with my present soil to weaken it down and reduce the total peat content. My mate used it once and it is very susceptable to bugs, they thrived in it.

Here are some links that might help you out:

http://www.onlinepot.org/grow/nutrients.htm
http://www.onlinepot.org/grow/nutrients2.htm
http://www.onlinepot.org/grow/PHfluctuationsornutrients3.htm

I highly recommend you read them because there is a lot of good info!!!!
Hope your garden gets better....

Peace

BKB

yo dude , u use soil and poor some perlite on top or this is perlite with some added soil ?

Kingrow1 said:

Then that my freind is a very serious situation indeed and you need professional help. I always bring the runoff up when i flush, i flush slowly and the more i flush the more my pH comes up to what i want. 5.5 is very bad!!

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Chasing pH by reading runoff is very bad. And useless...........

watchhowIdoit said:

Chasing pH by reading runoff is very bad. And useless...........

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I don't chase the pH, i water at 6.5 and wait for runoff to be 6.5, some pots take 3 times the amount of water and bad ones can easily take 6 times the pot size of water. This is correcting pH the right way, of course if you do not add enough lime or the soil dose not contain enough lime to buffer against this it will constantly keep reverting back to undesirable acidic pH's.

Is this chasing because a lot of good growers will tell you this is the best and only way to correct an acidic pH?

The only way to know the actual pH of your medium is to test the medium itself, not runoff. And the 'good growers' that tell you to read and follow runoff pH are just spreading the same misinformation they have learned. And to think you can change a mediums pH just by flushing pHed water through is just insane.

Depends why you are flushing, to reduce ferts and the acidic pH conditions they create and salts or simply to correct a peat acidity problem or similar, yes you won't change the mediums pH without lime or somthing but you can flush out soluable things which cause high pH.