need help with my seedlings

[Ross3k]

Problem: leaves yellowing

-Medium/grow method: canna coco and perlite 70/30 germinated in root riot cubes then potted into autopots top feeding for now

-Feed and supplements used:
Canna start and canna rhizo the last 3 days 1/4 dose Top feeding for now

-Water source: Tap, ph'd to 5.8 extra reading 350

-Strain and age. Blue treacle, inc bulk, cash crop, lsd-25.
Sprouted 6 days ago..

-Climate: 25 degrees daytime 20 night humidity is around 60

- Light used: optic 4 led 36 inches from plants

Run off is measuring 6.6


So I was thinking possibly a nutrient deficiency with the coco being neutral.. I was told they should be ok for the first 10 days, maybe not ? should I be hitting them with coco a & b already ?

or are they actually showing signs of burn from the small amount of nutes I have them already ?

 

[Dudeski]

Problem: leaves yellowing

-Medium/grow method: canna coco and perlite 70/30 germinated in root riot cubes then potted into autopots top feeding for now

-Feed and supplements used:
Canna start and canna rhizo the last 3 days 1/4 dose Top feeding for now

-Water source: Tap, ph'd to 5.8 extra reading 350

-Strain and age. Blue treacle, inc bulk, cash crop, lsd-25.
Sprouted 6 days ago..

-Climate: 25 degrees daytime 20 night humidity is around 60

- Light used: optic 4 led 36 inches from plants

Run off is measuring 6.6


So I was thinking possibly a nutrient deficiency with the coco being neutral.. I was told they should be ok for the first 10 days, maybe not ? should I be hitting them with coco a & b already ?

or are they actually showing signs of burn from the small amount of nutes I have them already ?

No idea bud, keep an eye on them.

 

[DABaracuss]

Just let it go ..somtimes you get light color with fast growth .

 

[GoAuto6]

Its tuff with having different strains. I suggest for beging cultivators to stick with one strain. It's easyier to tell if it's strain related. Or soil or grower error. I would be feeding at 1/8 strength by now. But if you look at picture 3 compared to the rest it looks good.

 

[GoAuto6]

Oh and a good soil probe like the accurate 8 is advised as run of could be 6.6 but soil ph could be at 5.8?

 

[Waira]

start mild feeds now,...like 1/4 strength depending on what you have,... that 6.6 run-off is high, oddly so,... is that pH meter recently calibrated? Stored in the proper solution to keep it moist?

 

[Ross3k]

thanks for the replies,

PH meter is brand new and calibrated and results are consistant with cheaper meter/test kits.
Looking around im putting it down to (lack of) nutrients in my coco, I think the problem was assuming they would be ok for the first week after sprouting with a little canna start and rhizo but I think the coco a & b are needed from day 1.

 

[Ross3k]

Now just confused by my run off readings

https://www.autoflower.org/threads/canna-coco-ph-and-ppms-in-run-off.63604/#post-1681940

 

[Waira]

ah! my bad, I just saw you're using tap water with high ppm's,... what's the unadjusted pH and TDS reading? It looks like you have pretty hard water, meaning there's a lot of dissolves CaCO3 in there, which will drive pH up, and strongly resist pH adjusting down,.. it's the carbonate/CO3 that's involved with the pH buffering mainly,... Your nutes are coco specific right? No extra Ca-Mg going in,...?
I suggest using RO/Di water, or even those self-fill water machines.. these will give very low ppm water, no buffering minerals in there to fight against on pH'ing down,... As for flushing, it can't be done like true soil, or you risk screwing up your coco's CEC balance, or buffering (not pH related),... this has to do with coco;'s powerful affinity to Ca, and Mg to a lesser extent,... it binds it very strongly at first, keeping it from the plant; only after it;s sated does the free give and take start working properly,... if you haven't done some research on coco, then do so mate! here, and Canna 's website too... it's unlike anything else, including other soilless mediums,....
Flushing solutions (if needed) I've seen recommended are: RO/Di water (low ppm machine made water is fine) with 150 ppm total of Ca-Mg, then another 150ppm nutes added in, pH to 6.0.... pour through until run-off is at or near input specs,.... this will "reset" the CEC buffering, and purge extra crap out,...

 

[DABaracuss]

Yea do what that guy says..lol