IM LOST! Cant really identify this problem with seedlings/small plants in coco...Sick plants or is it me?

Hello and thx for a great forum!
I have scoured of forums and guides for over 2 weeks now.

I cant really identify this.
Have i given to much nutrients? there is no dark green color of new leaves? is it deficiency?
Is the coco robbing my plants of magnesium? i upped the dose of calmag on some test plants and didnt se any change.
Is it pH problems? i did have a totally off calibrated ph pen over a week ago wich gave me 4 pH but now i have ph drops and another pen
and have been feeding ph corrected water with 5.8-6.1. I hope.
i believe i have overwatered at first.

I did a flush on one test plant with plain water but with ph 8 and about 200 ppm and that one is almost dead. its bascially not growing now.
i now give it the same strength 500 ppm
I tested another with full strength 900 ppm, im using biobizz series, and it didnt get bigger or sicker then the other plants i had on 1/3 of strength like 450-500 ppm.

Now today these two plants together with 15 more i gave some more fishmix last night totalling to 700 ppm, i guess its to much, but i tested it also on another plant last night for 4-5 hours and i didnt se any bad reaction.

is it light burn? i lowered the lamp abit. im using a CMH 630w conversion bulb plus a 400w HPS. they are both at about a meter. i have them for heat and also work light right now. the strain is Wedding glue auto. im new to autos and just did this run until i can clone from a wedding glue mother later.
i read autos need less nutrients or cant survive with normal dose? i have no experience of coco and choose this to use an medium for hydroponics.
i haev 10 years of experience of hydro and never did a fuckup like this. im new to coco just to learn about buffering to late. im using ugro pure perlite wich i found out to late is only "pre-buffered" with calcium nitrate, robbing plants of magnesum still?

no matter what i do, flushing, change nutrient mix, balance ph, have the temperature steady 26-27 degrees i se no change.
the leaf tips of the new set of leaves starts to yellow a bit, it spreads into the leave, the next leave set looks fine but gradually starts to yellow from the tip.
not looking like iron def but backwards.

is its root rot and thats why all of theese symptoms shows up so irrational?

i will be happy for some advice here. i have made alot of distilled water now and this i will flush them with calmag only. but at wich strength? every forum and guide says x ml per gallon? like okey from which strength? i would like some EC value. found a good youtube video though about buffering coco with EC 3 with calmag, twice and the rinse. i need to do this on the rest oft the coco as i ordered ugro XL organic. jsut to find out that organic in this sense means not buffered at all with chemicals. fuck. every other producet in their series is true-buffered except pure perlite och organic. what a lucky week

Plants are sprouted from seed 21 dec and planted in coco / cow manure mix 80/20 the 22 dec.
had their first set of leaves 26-27 dec.

i have some other control plants wich is hemp strain finola. they suffers the exact same def looking like calmag def. it tried to hit some with 10 ml/L biobizz calmag but se no difference.

i have 10 gorilla glue auto for bulk seeds with the same coco manure mix 80/20 just given phed water 6-6.5 fed from bottom once. an they look green and lush developing fine under a 1000w HPS lamp 150cm distance without the def ive seen on the wedding glue and finola. so what is up?

any advice on this would be very much appreciated. just ask if i forgot to provide some info. im keeping a diary but this post is just written straight out.


/Richard

Why did you use cow manure with coco?

I don't often say this but scrap them and start over.

I tried to follow all that but so many different inputs and changes I don't know where to start.

If you must save them, transplant into plain coco and feed 1/2 strength nutrient, pH 6.1 and see what happens.

Cow manure is going to hold water, difficult to tell what it is providing nutrient wise, did the farmer feed the cows gmo and other terrible shit like my neighbor does? Who knows, lose the manure as it is better suited for outdoors.

you did coco and manure and no aeration material like pumice or perlite?

The idea of using coco is to treat it like hydro- the plants only get what you give them. Cow manure is a soil amendment. Looks like your coco mix is too “hot” .

in theory sheep or cow manure makes sense, but in reality your weed will just taste like cow shit and will be a bit harsh, straight coco or a coco/perlite mix is the go

you can add your dry amendments on top once they are established, or just use coco nutes

the only thing i might add to a coco perlite mix is say a handful or two of seamungus (a seaweed/humus pellet)

don't add anything organic to coco...it's not made for organic growing, it's a hydroponic medium.
while some masochists use benes and try to go organic in coco, they invariably have trouble, nearly always with root rot.
it's so much easier to stay sterile in coco, and so much safer. go straight up Jack's 3-2-1 system and never look back.

I've always added coco to my bagged soil mix as an amendment -same as perlite, rice hulls and worm castings....never had any trouble using it that way. If you use the bricks, then you have to rinse and rinse and rinse it before using it because it has a lot of salt in it.

Quality coco comes washed and buffered these days. Regardless, new or used, I run nute solution through it until run-off ec is reasonably close to the ec going in. Use the ec appropriate for stage of growth.

wierd, this thread disappeared. i just found it now to do a follow up
thx for all the replys

yeah the cow manure sucked. to hot i guess, i just added 1/5
biggest problem was the water. it is 250 ppm here and contains 80 ppm sodium (found out through documents form the municipal water supply facility), the rest is lime - CaCO3.
i bought a large RO filter and filter all water and and diy blend calmag 1:2-2.5 aimed at 250 ppm total.

but as i have 10 years of experience of DWC i just went into full hydro mode hahaha.
so now i know coco, and drip feeding. i love it. no air pump sounding like hell. and u can use bottled organic nutrients without the ph drift in to hell also. i also shifted to T.As pro organic line instead. just need 3 bottles, has more stable ph. also bought kelp hydrolysate which i make a cocktail with. they seems to like it

this is how it went
left is auto flower (most harvested, every one survived) and to the right next wave of feminized.
mostly wedding glue and a power plant auto, wedding glue fem, and 2 bag seeds of lemon haze (experiment but turned out really well - i did made clones) but also a sunshine sherbert somewhere.



cheers

Roger A. Shrubber said:

don't add anything organic to coco...it's not made for organic growing, it's a hydroponic medium.
while some masochists use benes and try to go organic in coco, they invariably have trouble, nearly always with root rot.
it's so much easier to stay sterile in coco, and so much safer. go straight up Jack's 3-2-1 system and never look back.

Click to expand...

oh and yes, i went 95% organic with benes, tricoderma harzianum. rest 5% was some lefter over GH final part and phosphorus acid for ph down
and im happy with the result.
and did my own cal-mag blend out of calcium nitrate and magnesium sulfate. made two separate solutions of 10% each in RO water and just blend the min the rez together and circulate with a pump. works well, took an unused 250L polypropylen trashbin as rez. sterilized a couple of times of course.

its fully possible to go organic with this routine but thx for the jack tip, seems jack use the same cal-mag base.

theese pots are 37L and i only have 5 cm of layer of leca in the bottom, good for drainage in the beginning but when the pot is fully colonized one wouldnt need it. i did some pots without leca and you only need to be a little bit more careful with over watering before roots is fully colonized. one can even bottom feed the solution and they such its right up, im amazed to see

i also put a layer on top to lessen the evaporation. some dont have it, needs some more watering. but its marginal once they become large, its more dependat of how big they are in as how many fan leaves. so did strip them like twice, but not full defoliation, but some to provide more air through and also shed more light on shaded bud sites. i noticed a huge drop in the amount of water they used after defoliation.

i think i can reuse these pots like 10 times now with proper sterilisation and rebuffering. that is, 1500 ppm of 2:1 calmag for 24 hours then rinse to to same ppm as the municipal water. no RO here. let dry, but not fully dry and then add a weak nutrient solution before transplant of clone.