the lucas formula in a nutshell
Posted 08-15-2009 at 02:27 AM by IMgreen
Tags lucas formula
the formula isn't that bad once you get it.
I dont use the micro and the bloom mix because floranova bloom is micro and bloom already mixed (use the micro # as the FNB #)
((target - current) / target) * 8 ml per gallon * res gallons = FNB (ml)
an example is I have a 30 gallon setup that the nutes are at 920 and I want to put them at 1250
here's the math:
1250 - 920 / 1250 x 8 x 30 = 63.36 ML FNB
1250 - 920 = 330
330 divided by 1250 = 0.264
.264 times 8 = 2.112
2.112 times 30 = 63.36 ML Floranova bloom hits that in (RO water)
they can feed at full strength (about 1250 ppm) once they are past seedlings - as long as you have them under HID, 700 - 800 ppm under CFL
hydro is nowhere near as hard as you might think. there's no guesswork.
Just keep these three number in check and they will do you well:
Res Temp - 67 dgegrees (21C) is ideal (it should feel chilly, not tepid or warm)
PH - keep it between 5.8 and 6.2 no higher no lower for good nute uptake
PPM - 1250 is your baseline (under HID)
please don't use epsom salt in hydro. use cal mag++ every couple weeks if the plants need it
good luck and hit me up if you have any questions
I dont use the micro and the bloom mix because floranova bloom is micro and bloom already mixed (use the micro # as the FNB #)
((target - current) / target) * 8 ml per gallon * res gallons = FNB (ml)
an example is I have a 30 gallon setup that the nutes are at 920 and I want to put them at 1250
here's the math:
1250 - 920 / 1250 x 8 x 30 = 63.36 ML FNB
1250 - 920 = 330
330 divided by 1250 = 0.264
.264 times 8 = 2.112
2.112 times 30 = 63.36 ML Floranova bloom hits that in (RO water)
they can feed at full strength (about 1250 ppm) once they are past seedlings - as long as you have them under HID, 700 - 800 ppm under CFL
hydro is nowhere near as hard as you might think. there's no guesswork.
Just keep these three number in check and they will do you well:
Res Temp - 67 dgegrees (21C) is ideal (it should feel chilly, not tepid or warm)
PH - keep it between 5.8 and 6.2 no higher no lower for good nute uptake
PPM - 1250 is your baseline (under HID)
please don't use epsom salt in hydro. use cal mag++ every couple weeks if the plants need it
good luck and hit me up if you have any questions
Total Comments 7
Comments
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i'm not getting this formula. the .7 or .5 conversion? my city water is 150 TDs so i added general hydroponics and its at 450 tds now but my ph was at 6.3 i just lowered it to 6 today to see. but i think your saying i need to have my tds higher. well right now the stocks are kinda purple and it might be a deficiency from what i have been reading. but if i up the tds i just noticed my tips of the leaves are already just a little burnt. can you help me with this thanks.Posted 10-16-2009 at 02:01 AM by tbirdgreen
- I sure can tbirdQuote:Originally Posted by tbirdgreen
i'm not getting this formula. the .7 or .5 conversion? my city water is 150 TDs so i added general hydroponics and its at 450 tds now but my ph was at 6.3 i just lowered it to 6 today to see. but i think your saying i need to have my tds higher. well right now the stocks are kinda purple and it might be a deficiency from what i have been reading. but if i up the tds i just noticed my tips of the leaves are already just a little burnt. can you help me with this thanks.
Mine works at .5 conversion with floranova bloom
You have some pretty clean water if your ppm is at 150 by itself
You want to keep your ph at 5.8 as much as you can. if it was at 6.3 you will most likely see deficiencies
I don't know what kind of light you use but if you are under CFL you have to go half strengthPosted 10-16-2009 at 05:27 PM by IMgreen - i'm using right now a 400w mh light and i'm using floral grow , micro and bloom.
i lowered it yesterday and its up to 6.1 right now i'll bring it to 5.8 tonight but i'm sure my tds was 450 lastnight and its 460 right nowPosted 10-17-2009 at 01:23 AM by tbirdgreen - right now you are using all three?
you don't need the veg, just micro and bloomPosted 10-17-2009 at 01:30 AM by IMgreen - oh okay so i thing the room temp is 70ish and if my city water tds is 150 with the micro and bloom what should my tds be at? there about a month old......with good roots and why is my tds going up?Posted 10-17-2009 at 01:33 AM by tbirdgreen
- do u add anything more when there in flower?Posted 10-18-2009 at 07:42 PM by tbirdgreen
- just a little cal mag++ every once in a whileQuote:Originally Posted by tbirdgreen do u add anything more when there in flower?Posted 10-18-2009 at 10:46 PM by IMgreen
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