Identify this deficiency PLEASE? (DWC)

[mxshli]

In week 1 i just use plain tap water with .5ml per litre of sm90 and ph the res to 5.8

Week 2 i start at 1/8th strength of ghe and add a calmag supp at 0.3ml per litre- thats with plant magic magne cal+ other brands will be different.

And if you dont already have either sm-90 or hydroguard i would advise you pick one of them up. They keep the res and roots healthy and clean and keep nasty pathogens at bay even in high res temps.

I will get some calmag supplement and try to get hold of hydroguard or sm-90.

I've written out the timeline for that first bigger seedling:
Day 4 -> 5: pH fluctuations
Day 6: Root touches the water (level an inch or so below the pot)
Day 9: Added 1/8 dose
Day 13: Added another 1/8 dose
Day 10 was still looking great. First yellowing started on day 11/12. Today is day 14...

I've noticed the european and US GH websites have grossly different feeding schedules.
I'm following this one: http://www.eurohydro.com/publicatio...ries/Feeding-Charts/CHART-FLORA-SERIES-EN.pdf
So a 1/4 of the dose in week 2 is roughly 1.25ml of each bottle in 5 gallons.. Is it the same as the one you are following? The US one recommends much higher amounts than the EU version. Is that way too little maybe? Should I be using higher doses maybe with this schedule?

 

[woody]

Never seen the euro schedule before mate- that sounds very weak? . I used the american one and converted american gallons into litres my 1/4 strength for week 2 would work out at around 3.2ml each per 10 litres. That brings my total ppm to around 250ppm

 

[mxshli]

Am I allowed to swear on here? lol! Ok so they've been starving basically...

I guess the european department realised the schedule was way too high and fixed their labels...
What's it say on your bottle? My bottle shows the same weaker schedule.
Reckon can I just follow that euro schedule as it is then? Can you link me to the schedule you follow so I can compare?

 

[woody]

https://generalhydroponics.com/feedcharts/
I used the floraseries recirculating one and dialed it back.

Its not that bad man- your reading ph and ppm and thats more important than a schedule a greedy nute company makes up!

Ive had a couple shaky starts in dwc too
Heres a blue cheese auto at 13 days old

Still finished up over 300g dry

 

[mxshli]

How far did you dial it back? It's hard to work out how much is too much when it's so little that it doesn't real drink so much water to affect the EC...

Thanks btw, that's a proper relief seeing that... really phew

Also, you don't think the european one is is at a different concentration possibly? Or are they just using different marketing material? That's why I was wondering which schedule it shows on your bottle label.

 

[mxshli]

Found their FAQ on the European site. It's the same liquid. Also they answered this question:

Why don't you have the same application charts as General Hydroponics (US)?
"This is because, culturally, North American growers work with a higher EC."

Now you know ;-P

 

[woody]

Found their FAQ on the European site. It's the same liquid. Also they answered this question:

Why don't you have the same application charts as General Hydroponics (US)?
"This is because, culturally, North American growers work with a higher EC."

Now you know ;-P

That strange because 1.2 ec is the same in new york or london!
I have the euro schedule on my bottles too bud.
Heres the schedule i use for my recirculated drip system- still need to dial this back for dwc. But the ratios of micro grow bloom are to gh's recommendation.

Those values are ml per 10 litres of water

 

[mxshli]

That strange because 1.2 ec is the same in new york or london!
I have the euro schedule on my bottles too bud.
Heres the schedule i use for my recirculated drip system- still need to dial this back for dwc. But the ratios of micro grow bloom are to gh's recommendation.

I know... but "culturally" they work with a higher EC in new york.... hahaha, no idea what they're on about tbh!

Question about that schedule you're following.. When the plant is bigger I can use the changing ppms to judge how much food to give it (at the same ratios), but how do you work out how much to dial it back in the first 3 weeks? In practice are you dialling it back by half/quarter or not so much?

 

[mxshli]

Are you using the GH hardwater micro? Might be a good idea.

Thanks buddy, that's the one I'm using, thanks for the tips !

 

[woody]

Yea mate i take note of ph and ec/ppm readings daily.
If ppm drops from 250 to 200 i would up the feed to 300 and see how she handles it
Roughly i go
Week 1- 150ppm (plain tap water)
Week 2- 250ppm
Then let the plant and res tell you what she wants from there.
I will get round to making a proper dwc schedule soon!