First grow:4wks and yellowing leaves :( please guide me

Yes, i mean you should be mixing nutes with every watering. I would only be feeding plants that size with an ec of about .8 or 1 at the most. Do you have an ec meter?

I would stick to the same schedule you're doing right now, just add nutes every time you water it. I would also bring your ph down to around 5.8

seabird guano is good for younglings. once in veg u can use bat guano. good luck

Totally agree with both of you, flushing is the safe thing yo do, however if ya don't know 100% what your looking for then granted you might have made a boo boo but like sensi said go easy but they do need nitrogen. Also not trying to be too particular or an ass butt it is really hard to get a good bead on your problem under LPS lights, granted most of us long time growers tend to automatically convert our diagonosis if someone posts under lightning that changes the color of the problem. I have a little nursery area away from all the other grow areas that I keep one of each type of light in small wattages so I can examine with care any one plant without getting the top of my head seared. I take it you have looked at your plants under normal white light...organic nutes like bat guano, worm casings, premium dog shit....I even know a street dude in Berkeley that swares by human feces, from what I have herd as long as its a mammal and shits you can go with for nitrogen. (keep in mind these folks that make the hand crafted fertilizers do know there shit).... the potency of these nutes is usually 1-1.5-1 or 2-1-1 which means in a gallon of H2O you are using and ounce or two depending on what the plant can handle. Keep also in mind that alougth the organic nutes are safer (esp for your kids) they linger a bit longer then quick release chems. Since your in co-co kinda half way between soil and pure liquid go easy. If as the consencus seems here you over flushed..which looks correct to me also, you may at some point want to try some pure nitro power in 1/4 - 1/2 strength, Im old school in some ways becasue I am cheap and have stuff around I would use ( I just started using bat guano worms etc.. on my big buxom girls its not cheap but I do like it so fAR- THANK THE FOLKS HERE I STOLE EVERYTHING I KNOW FROM HERE ) but I bet if you used 1/4 strength rapid "old school" grow that stuff is blazing at 23-19-17 and has returned very nice dark dark green to my plants in about 36 hrs ( I am 65% SOIL 35% Peralite) or use what ever you want for nitro - I have seen 5-1-1 or 2-0-0 listed on various nutes also check your PH of your run off make sure you are not so far out that you have locked up nutes...cheers hope this helps

Sensi : no I do not have an ec meter, I am not sure what that is.. Is that for ppm.. Because I don't have a blue truncheon either but I have a ph tester which I normally do between 6 and 6.2 as you said but if you think I should put it down to 5.8 I am willing to try something new.... I am willing to try anything right now...even bat poo!

Hammer : thanks for visiting this post as requested, really appreciated. I will buy some Seabird guano tomorrow then... I just thought bat was the way to go through reading? I am not quite sure how to make it though... Maybe I should get 1 cup to a bucket... And let it mix in for a few days? Do I add nutes to it? I have rhizotonic can Axum etc but maybe to early for the cannazym? And the rhino might nit mix with the guano? I dunno, it all seems like a big science experiment to me...

Einstein thankyou for your post, it's very nice to have more than one person try to help. Forgive me for my noob comments but I still don't understand what run off means... Is it the excess that drains through the watering holes after feeding I'm guessing? What is this nitro power you mentioned and where can I get it... I am not very clued up with npk ratios I literally am at the stage where i have just started a grow for a hopefully lovely bit of medicine and I mix water with coco a and b on a very light dosage of 1tiny cap to a bucket and that is it. .... I have researched but the research seems to be endless :/

You should really get an ec meter mate, it measures the electrical conductivity(how much nutes are in your water). Really handy piece of kit.. Yeah i would definitely lower your ph a touch.

I think you'd be better off just using a one part nutrient, really simple to use until you feel more confident. Mixing lots of different nutes will just end up confusing you and lead to further problems down the line.

Run off is measuring the ec of your water that as come out of the bottoms of your pot after watering.

Ok I will look to get one... at what level should this ec be set at? And sensi tell me if you think this is ok...ill wait until tomorrow as I have already flushed it today. Make some guano mix for a few days time... And feed it canna a and b with 5.8 water for feeds, thenvmaybe the third I'll all some rhizo with water?? And keep going like that in small doses?

This is my Opinion , they may be lacking N , in your feed , but i would lean more this way , i feel you have overwatered , the flush did not help this cause , i would bet if you pulled those up a little you will see roots clustering around the same area, the result is new growth wilting off as it does not have the root system it needs to support it.
Dig around the soil , about an inch deep with your finger , see how strong the root system is , i do not claim to know it all , but i have encountered many problems and solved them , sometimes a symtom can point you to more than 1 issue, it's deciding which is the correct 1, well in younger plants my idea is more likely to be the case , it's not very often a MJ plant so young and in veg will show such severe signs of underfertilisation , try this first it wont harm your plant 1 bit and you will no for sure, the cure is a transplant into a freshened up airy medium, peace Umbre...

Go for an ec of .8 mate 1 at the most. Then slowly build up as the plant goes bigger. My plants are 3 weeks into flower and are 48inches tall, my ec is at it's highest right now and they are only having an ec of 1.4, these plants do not need to be pumped full of nutrients. Rhizo can be mixed with your canna a+b. How much canna have you been feeding them per litre of water? How many ml of canna does it say to mix with a lire of water on the bottle? With the nutes i use, 2 ml per litre of water will give me an ec of 1.2

Clonex said:

This is my Opinion , they may be lacking N , in your feed , but i would lean more this way , i feel you have overwatered , the flush did not help this cause , i would bet if you pulled those up a little you will see roots clustering around the same area, the result is new growth wilting off as it does not have the root system it needs to support it.
Dig around the soil , about an inch deep with your finger , see how strong the root system is , i do not claim to know it all , but i have encountered many problems and solved them , sometimes a symtom can point you to more than 1 issue, it's deciding which is the correct 1, well in younger plants my idea is more likely to be the case , it's not very often a MJ plant so young and in veg will show such severe signs of underfertilisation , try this first it wont harm your plant 1 bit and you will no for sure, the cure is a transplant into a freshened up airy medium, peace Umbre...

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I don't think he's over watered mate, coco very hard to over water. Unless he's leaving is pots sitting in puddles of water.

sensiblue said:

I don't think he's over watered mate, coco very hard to over water. Unless he's leaving is pots sitting in puddles of water.

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Overwatering may not be the cause , but , i have studied his pictures and his plants are struggling from mild rootlock , now i can go into this deeper if you wish , i am trying to keep it simple as it is his first attempt , that is wilt , not a feed issue 4real , peace Umbre...
Note also it is only 2 that are really struggling , yet in same medium on same regime ...

But they wilt with lack of nitrogen. Those plants are 4 weeks old in coco and they've hardly been fed.

I will definitely buy the ec meter... Clonex, are you suggesting I use a new batch of coco, take it out of the one it's in at the moment and start with fresh medium? As a newbie should I be worried that I might break the roots or damage them in some way attempting to transplant out of coco? The issue wherever I have looked always seems to be that no one can really agree on what the issues are and what the best way to recover is..... I could be wrong but I can't see it being that I have over watered... What basic steps would you like me to check up on in the tent and I will come back to you with the diagnostic.... I am happy to take advice from both of you as you clearly both know what you are talking about. Just need to keep it a bit simple.... My brain is like a sponge, but not a big one :/ thanks for this whole thing guys. Peace and love

Hope it all works out for you mate. Happy new year.

Check the roots, you may not need to change the coco , did you clone them straight into coco or did you use coco jiffy pellets maybe ? i no that plants struggle to root in these , they find it hard to push through the sack sidewall , i can only advise you on what your pictures tell me , if you follow what i told you , you can find out with no damage to the plant , it may just be you need to break open whatever you cloned it in , you wont damage the roots if your careful , coco shakes off well easy , if i'm wrong what have you lost ?, at least you wont overfeed and not be able to reverse it , check it first , then take other steps like suggested by sensi , take your time , learn as you go , there is no rush or panic.

Sensi, happy new year mate, good luck with your girls and thanks for the advice.

Clonex, I grew them straight from seed, a reliable source though. Barneys vanilla kush. I am going to get the guano.. Do the tea in 2 days after a nice nute feed tomorrow and then see what happens. If there is no change i will replant, they have grown in the coco since its seed sprouted .... So i would like to stick to that completely if possible, I have read some good reviews on it's reliability but nevertheless something i have done is wrong and I need to get to the bottom of it... If the guano tea doesn't work,we know it's not a nitrogen problem and so on right? I guess after a few attempts I'll get a feel for how they work... It's just a shame it wasn't as straight forward as people would seem

Thanks mate.

I'm sure in a weeks time after a few feeds, you'l see the difference. I'l keep an eye out for this thread, let me know how you get on.

I just found this, does this seem familiar?
[h=4]Detecting Nitrogen Deficiency[/h]The visual symptoms of nitrogen deficiency mean that it can be relatively easy to detect in some plant species. Symptoms include poor plant growth, and leaves that are pale green or yellow because they are unable to make sufficient chlorophyll. Leaves in this state are said to be chlorotic. Lower leaves (older leaves) show symptoms first, since the plant will move nitrogen from older tissues to more important younger ones.[SUP][2]

​All the best.
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Brokerj said:

Sensi, happy new year mate, good luck with your girls and thanks for the advice.

Clonex, I grew them straight from seed, a reliable source though. Barneys vanilla kush. I am going to get the guano.. Do the tea in 2 days after a nice nute feed tomorrow and then see what happens. If there is no change i will replant, they have grown in the coco since its seed sprouted .... So i would like to stick to that completely if possible, I have read some good reviews on it's reliability but nevertheless something i have done is wrong and I need to get to the bottom of it... If the guano tea doesn't work,we know it's not a nitrogen problem and so on right? I guess after a few attempts I'll get a feel for how they work... It's just a shame it wasn't as straight forward as people would seem

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Well your doing it backwards, good luck to the backwards man ......

That is what it sounds like yes and thanks again sense please do keep an eye out as i will update it next week with pics from a computer.

Clonex, that's not fair to say, you know I appreciate your help I don't understand why you are saying I am doing it backwards, I thought that's what you wanted me to do, I just thought I would give a trial on the nitrogen optIon first no?

Being the more serious of the two I thought I would leave the transplant for a few days just to give the guano a trial and error ?