Nute deficiency???..Lucas Formula..Pics
- Thread starter killa killa kk
- Start date
Funny thing.... when you run Lucas at 50% strength or less, you run into almost the same looking problems as when you overfeed.
Just bump up your feed strength to 600-800ppm (.5) or 1350-1400ppm (.7) at your current pH and you'll be fine.
You may also find that you really don't need to feed as often as you are. With high oxygen rates in your nutrient solution it won't matter as much but a few feeds a day is fine.
Stay Safe and learn something about radiation.... everyone around you certainly doesn't.
Just bump up your feed strength to 600-800ppm (.5) or 1350-1400ppm (.7) at your current pH and you'll be fine.
You may also find that you really don't need to feed as often as you are. With high oxygen rates in your nutrient solution it won't matter as much but a few feeds a day is fine.
Stay Safe and learn something about radiation.... everyone around you certainly doesn't.
petemoss
Active member
The Lucas formula is merely a ratio composed of one part GH Micro with two parts of GH Bloom. It can be mixed to full strength and diluted to any strength (EC) depending on your light intensity. Delta9nxs explained it better than I could here:
https://www.icmag.com/ic/showpost.php?p=2417963&postcount=22
https://www.icmag.com/ic/showpost.php?p=2417963&postcount=22
Just bump up your feed strength to 600-800ppm (.5) or 1350-1400ppm (.7) at your current pH and you'll be fine.
can you explain our nutrawand
the numbers on the wand
ppm cfec
280 40.4
420 60.6
560 80.8
700 101.0
840 121.2
etc/etc
we feed at between the 420 and the 560 'ppm', with a ph of 5.5/5.6- at this level the ph rises to 6/6.1 over several days, and the ppms stay more/less the same (our water is 6.0, no ppm's register)
if we feed at a higher ppm, after a few days the ph rises to 6/6.1 as above, but the ppm's also rise.
but are we reading the wand correctly as 450/500 is a far cry for the 1000/1200 your guys speak of... very confused
Funny thing.... when you run Lucas at 50% strength or less, you run into almost the same looking problems as when you overfeed.
Just bump up your feed strength to 600-800ppm (.5) or 1350-1400ppm (.7) at your current pH and you'll be fine.
You may also find that you really don't need to feed as often as you are. With high oxygen rates in your nutrient solution it won't matter as much but a few feeds a day is fine.
Stay Safe and learn something about radiation.... everyone around you certainly doesn't.
Good post, IMO 90% of growers overfeed, it's not until you run weak nutes and hand feed daily that you understand what they actually need.
Good point to your post, if you overfeed, plants are stunted and growth stalls. If you under feed, plants respond immediately to increased nutes.
In the end, feeding the minimum nutes needed produces larger buds, taste is superior, and it burns cleaner..
Error on the side of caution = weaker nutes...
killa killa kk
New member
wow alright, so I will do a flush of straight RO water tonight and then bump the nutes up to a straight 8/16 ratio raising ppms up to 1200 or so and take it from there. I guess im the confused one cuz I thought I needed to start off at quarter strength and eventually get to 1200ppm in a few weeks
Just curious how you came to this decision reading this thread? 1200 ppm is too strong...
DigDuggreen
Member
Zack... I to use the Canna nutrient line and have found that the plants cannot handle to much of it, canna must be a lot more concentrated. I have grown several different strains and use several different nute companies and everything else you can run at high ppms, but for canna that never seems to be the case. My question to you is. do you veg with it? cause I have had great results with flowering with it and poor results vegging with it. I mean everything else Ive used has been way better. In fact fox farms and cutting edge seem to be better than canna when it comes to veg. Im currently playing around with GH and I have no complaints.
Peice.
Peice.
The newer growth looks fine, so I wouldn't worry about it too much.
Refill with water, run it a few hours, refill with new nute solution at about the same ppm as you have now. A flush and fresh batch will help fix most problems in hydro. If things get worse after that, then you have issues you need to work out. Old damage usually doesn't fix itself, just make sure damage doesn't spread and new growth looks good.
It's always hard to tell from pics. If the leaves are crispy then it's probably overfed, if not then you might be slightly underfed. Some of them look fine, some looks like a slight mg deficiency. Could be low mg, or could be ph not in proper range.
Lucas formula is 8ml micro 16ml bloom per gal which comes out to 1200-1600ppm depending on your meter. Most people use it as a ratio and adjust to their needs. 1 part micro to 2 parts bloom. I've found when using it at low strength and with low ppm base water you need to add calmag. At full strength calmag usually isn't needed.
Refill with water, run it a few hours, refill with new nute solution at about the same ppm as you have now. A flush and fresh batch will help fix most problems in hydro. If things get worse after that, then you have issues you need to work out. Old damage usually doesn't fix itself, just make sure damage doesn't spread and new growth looks good.
It's always hard to tell from pics. If the leaves are crispy then it's probably overfed, if not then you might be slightly underfed. Some of them look fine, some looks like a slight mg deficiency. Could be low mg, or could be ph not in proper range.
Lucas formula is 8ml micro 16ml bloom per gal which comes out to 1200-1600ppm depending on your meter. Most people use it as a ratio and adjust to their needs. 1 part micro to 2 parts bloom. I've found when using it at low strength and with low ppm base water you need to add calmag. At full strength calmag usually isn't needed.
Let your plants tell you what they need. I dont see a whole lot of problems in your pics, so I wouldn't change much
Imho, bumping the EC to 1200 ppm is asking for trouble, unless you like nute burn.
Imho, bumping the EC to 1200 ppm is asking for trouble, unless you like nute burn.
Saran
Active member
The Lucas ratio is 100N-100P-200K-60Mg . This profile can be mixed without using any of the GH components because it is strength of individual elements we are concerned not the amount of a nutrient product used .
This must be calculated based on the chemical analysis of the fertilizer and amount added per gal . Any dilution or reduction in added nutrient will change the calculation and the ppm/EC reading and of course the strength of individual N-P-K and Mg strengths .
Hence a dilution or reduction in added nutrient is no longer the Lucas Formula 100N-100P-200K-60Mg .
I think we can all get our heads around this one or maybe will have to do a Mr. Science video from U-tube .
Also it is important to say as long as its a good hydro nute mixed within directions on the bottle or package the shit's going to grow .
This must be calculated based on the chemical analysis of the fertilizer and amount added per gal . Any dilution or reduction in added nutrient will change the calculation and the ppm/EC reading and of course the strength of individual N-P-K and Mg strengths .
Hence a dilution or reduction in added nutrient is no longer the Lucas Formula 100N-100P-200K-60Mg .
I think we can all get our heads around this one or maybe will have to do a Mr. Science video from U-tube .
Also it is important to say as long as its a good hydro nute mixed within directions on the bottle or package the shit's going to grow .
Last edited:
killa killa kk
New member
ok, I just know that if I had to put my Lucas formula into an equation it would be more like 4/8 ratio because I started out at a quarter strength solution and added a tad bit more thats how I got up to 446. If I would have started with a straight 8/16 ml per gallon. my ppms would be alot higher(probably like 1200 ppm, thats why I said that number previously) So having the lower number of ppm is where I believe I am having my mg deficiency so I thought raising it would fix that problem. Sorry thats where I got confused.
DigDuggreen
Member
Killa.... your plants actually look pretty good. if your having a cal/mag def. witch looks to be the case the flush it once, drop your ppm's to about 375 and add a about 4 ml of cal mag. that is my suggestion.
bbing
Active member
are you kidding?
yep... we use it for veg and flowering... we started about 5 years ago and it was the only nute we have used...along with pk13/14 once in the 6/7th week of 12/12..
but a few weeks ago after reading on rez's pages 'the receipe', decided to try gh nutes... so for the next grow/s (bought the large containers) it will be gh... since we still have some canna, think will do a side by side for a few plants... thanks
DigDuggreen
Member
Id like to know how that turns out. for some reason though with canna during veg I am always deficient some where and have not been able to dial it in
killa killa kk
New member
This is where I am confused. After reading the original Lucas forum he says he starts all clones off at 8/16 ml per gallon and depending on your meter it will come out to 600-800 @.05 or around 1200 at .07
Now I under stand you can dilute the formula down and come up with the same results but if I would have started from 8/16 ml from the start I dont think I would have ran into these deficiency's.
Im not trying to make this hard just clearing it up for myself and any other readers on this forum
bbing
Active member
no not that: Dankgravy. I wanna see anybodys rooted clone get plunked into 1200ppm.
I know the profile is based 8/16; however, that meters too hot for most of us. The fx works dilute for vegging w/ a little N it gets from calmg.
you guys remember the thread w/ lucas and pete moss?
was that here or OG?
fuck, i didn't know there would be test on this....I woulda studied harder.
I know the profile is based 8/16; however, that meters too hot for most of us. The fx works dilute for vegging w/ a little N it gets from calmg.
you guys remember the thread w/ lucas and pete moss?
was that here or OG?
fuck, i didn't know there would be test on this....I woulda studied harder.
killa killa kk
New member
This is what I meant to quote haha. No I dont believe I have seen that thread bbing
