Hydro: Some plants like it, some don't...

[kenned]

How long has this problem been going on? since beginning, ca 14 days
Are you growing in a PVC grow tent? (example: Hydrohut or any other non brand tents) no, normalt closet.
What system are you running? (DWC? Ebb flow? Aero? Water Farm? Flood Tables? and so on...) i'ts a homemade ebb-flow in bedroller.
What STRAIN are you growing? 2 x marleys collie, 3 x sd X og kush
What was the establishing technique? (Were the seed or clone?) seedling
What is the age of your plants? ca 14 days old
How tall are the plants? ca 6-8 cm
What PHASE are the plants in? (seedling, vegetative or flower) are the plants in? they are in vegatative stage

What substrate/medium are you using?(Hydroton, RockWool etc.) hanging in rockwool, with roots hanging free..
What is the Water temperature? room temp.
What color are your roots? White? Brown? Are your roots slimy? some are normal white, some are a little browny..
What Nutrient's are you using?(If growing soiless) GHE One part
How often are you feeding? (If using soiless) Used to flood almost all day, now it's 4 times a day, for 15 min.
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect) only using veg nutes
What is the TDS/EC/PPM you are using? first 7 days, 1150 µs, last 7 days, 1280µs
What is the pH of the "Tank"? between 5,4-5,8
Are you sure your calibration is correct on your equiptment? quite sure, calibratet before measuering
How often do you clean your system: example: Flush out water replace with clean water and nutrients? Have not changed water yet..
What size bulb are you using? 250w mh
What is the distance to the canopy? Ca 42 cm
What is your RH Factor(Relative Humidity)? Not sure, dont measure..
What is the canopy temperature? Usin cooltube, so it's not to hot..
What is the current Air Flow? (cfm etc.) Using 3 pc-fans, nice flow..
Is the fan blowing directly at plants? No..
Is your water HARD or SOFT? quite hard, ca 600 µs from tap..
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? Tap water..
Has plant been recently pruned, cloned off of or pinched No
Have any pest chemicals been used? If so, What and When? No

Pics..
2 plants look like this, looks like they are having a great time..

Another looks like this, not that happy..

and the most sick looks like this, really sad..

1 day later:

What can cause this???
Please help..

 

[kenned]

come on guys...!?!
No one?
My plants are dying on me here....

 

[sneakinman13]

idk to much about hydro.
but i would say empty. and replace with fresh ro water.. and also give them some sort of nitrogen .. if u have nutes...
and last but not least get a ppm meter if u dont have one cause thats probably the cause to all ur probloms...
good luck

 

[icough2getoff]

an EC of 1.1 sounds really high for the first 7 days of a seedlings life. I give seedlings straight RO water the first week and they grow fine with no nutrients. Seems like some took it better than others.

Your tap water also seems kinda hard. You might consider a reverse osmosis unit if you continue to have problems but my guess is that you fried them if you gave them 1.1 EC since day 1

 

[Greyskull]

What is the TDS/EC/PPM you are using? first 7 days, 1150 µs, last 7 days, 1280µs
What is the pH of the "Tank"? between 5,4-5,8
Is your water HARD or SOFT? quite hard, ca 600 µs from tap..

I am not much of an expert but it sounds to me like you are feeding the seedlings a little too strong at too low (or high... however you look at it) ph.

Maybe give the seedlings max feeding at 700ppm @ 6.0ph?
those one parts are loaded with everything and some of your little seeds aren't ready to take it all in in heavy doses yet. Some strains eat differently than others though.... gotta find the balance when your running a single rez.

Good luck

 

[neuroherb]

I haven't tried ebb & flow but I do use NFT.

As a seedling I wouldn't be using a stong nute mix at that stage of size & age. It doesn't appear as what I would see as traditional nute burning as it looks more like the leaf is washing out. It could still be nute burn and the amount has just shocked the whole leaf in one go not just starting at the tips.

What I would try is changing my res PH 5.8 and if that didn't stop the yellowing add appox a 25% nute mix after a few days. I use Canna range so that would be 2ml to 5 litres.

 

[stinkyattic]

EC way too high for seedlings.
Bump pH up to ~5.8.
If you did not pre-soak your RockWool down to pH 6 you could be seeing problems from that as well.
What's up with tinfoil? Get your plants in a correct bed medium like hydroton, or plugged into a RW slab, or something- Al in contact with acidic solution will eventually leach off and you don't want that.

You say ebb n flow with roots hanging free? You gotta pick a system and do it right- areo, ebb n flow, or DWC. E&F requires a bed medium to protect the roots from desiccation and light between floods. DWC requires constant contact with high-oxygen fert solution. Aero requires correct sprayers in the root chamber. I don't think you have a system that will function properly over the amount of time required to flower your plants.

 

[wygram]

what does "GHE one part" mean... floranova?... also, that is a strange ebb and flow set-up... usually there is a medium (like hydroton) in which the plant's roots grow... this too me looks like a DWC bubbler setup more than E&F... if the roots are hanging in the air and are only flooded periodically, there might not be enough moisture and the roots may be dying causing all sorts of problems... secondly, you should take care of the algae quickly, it starves these small plants of oxygen, which is vital when running nutes at the strength you are

 

[jm420]

I agree with change you set up ,and you definately need some sort of medium,lava rock, hydrotron for stability as well as they hold water.I dont know about your nutes ,I use the gh 3 part per directions.you could try somthing like this



this is 4weeks from seed using just the directions on the bottle

I dont use a meter ,i use ghdrop ph tester at 6.0 water changes evey sunday
I dont have pics now but my fems are almost 6 feet with flowers every where
Iwould change the way your growing thats just my op.Btw this is my first grow so take it from where it comes Good luck

 

[stinkyattic]

^^^That system is identical in every way (including color and brand of tub) to a micro hydro setup that a medical user associate of mine grows his meds in, and it is a good choice to um.. 'get your feet wet'...

 

[jm420]

LOL its cost effective and you can double up the tub if you dont want to go swimming,but seriously its been a great learning tool for me

 

[kenned]

So what you are saying is this...:

Raise pH to ca. 6,0?
Fill up bedroller with those small hydrotons (or what it is there called)?
Lower ec/µs to ca 1/1000?

Is that all???

That is waht I can change, without using money, and those I don't really have any of right now...
Tomorrow I'm gonna explain why I dont have any leca-balls in the bedroller...

THANKS,
kenned

 

[kenned]

so, this is what I've done..

Raised pH to ca 6,8
µs ca 1100...
Further more I have painted the bedroller all black and added hydroton,to fill half the bedroller...

oh, and yes... Why I did not use hydroton before.. Hehe, I'll explain tomorrow..

What you guys think??

kenned

 

[jm420]

hows your plants?6.8 seems high but good luck

 

[Homegrow3r]

1100 us still seems kinda high, for the age of the plants, drop it again to about 750-800 until they come back to themselves.

Are the plants all the same? An indica will like the heavy feeding moreso.

 

[kenned]

Update...

So.. The ebb'n flow didn't work out for the plants, so I changed it and made a.. Haha don't know the namefor that system...

But pump waters the plants 4 x 15min a day..

Lowering the µs didn't really work for the plants, so I'm tryin to raise the µs to about 1500, and see how that works... :S

currently my µs is around 1380, but I'm thinking it might be just a little to low, because the plants are not 100% fine, yet...

I think I have seen a little improvement, after I raised the µs, but I'm not 100% sure..

The pH is pretty stable at around 5,7-5,8..

What you guys think....??

thank,
kenned

 

[stinkyattic]

I ran a vertical NFT like that but on a 24/0 watering. 15min 4x/day does not sound like nearly enough water, and NFT styles are designed to run constant. Hydroton is too porous to treat like a drip that depends upon small particle size to hold water between cycles.
But that NFT is a super easy DIY hydro. As long as the tumbling action of the water is vigourous, or you have an air stone, it works very well. Peep this:
http://boards.cannabis.com/grow-log...-nft-take-ii-stinky-kinda-likes-darkside.html

Your plnats are hungry too...

 

[kenned]

So thats it???
I'm just underfeeding my plants??

 

[stinkyattic]

No, that's not it- Hydroton as an automated drip or NFT should be run on constant, not 4x a day for 15 min. That's definitely not enough water, and they look wilty to confirm.

 

[kenned]

I'm not saying you don't know what you are talking about, but the plants are not wilty at all...
They look really fine.. Or they did this morning when I checked them...

Or maybe it's not enough water to keep the roots nice and healthy??