Lucas formula???

[baccas125]

I was wondering if anyone could link me to the lucas soil formual i know it here somewhere but i just can't seem to find it. I know there are a lot of new growers that could use some help mixing soil. I have my own methods but i thiought a tried and true formula would help some new grower out.

 

[Teresa]

Lucas had a thread here.........

http://www.icmag.com/ic/showthread.php?t=21254

Maybe drop in and ask him for it :friends: :wink: .

 

[blackfin]

here ya go baccas,

General Hydroponics Flora Series Feeding Strategy - Lucas Formula

G-M-B (Grow-Micro-Bloom)
0-5-10 - For Vegitative cycle (18/6)
0-8-16 - For Flowering cycle (12/12)

The numbers indicate the number of mililiters of Grow, Micro or Bloom
formulas that I use in one gallon (US Liquid) of nutrients.

You will notice I don't use any of the Grow formula, don't need to,
the Micro provides plenty of Nitrogen.

There are two ways to work with this formula:

1. Top off the reservoir daily using a pH corrected water solution as
required to maintain full reservoir level. After adding back an amount
of water equal to the amount of your reservoir capacity you should
change the reservoir and put in fresh solution.
2. Top off the reservoir daily using a pH corrected 100% strength
nutrient solution as required to maintain full reservoir level.
Continue to use this nutrient solution without dumping the tank unless
the PPM rises above acceptable levels.

Between vegitative and flowering cycles you should dump your
nutrients, then flush (possibly with Clearex) to remove salt buildups,
then change to the other feeding program.

For young plants, just transplanted into the hydro setup, give them
50% strength nutrient mix to prevent overfeeding them while their
young. Gradually bring up the mix to full strength as they grow over
the next few weeks or so.

The lucas formula is normally intended for use with RO or near 0 PPM water.

NOTE: The lucas formula eliminates the need for epsom salts to correct
Mg deficiendies in most normal feeding programs recomended by
manufacturers. Cannabis needs a lot of Magnesium to thrive. The Flora
Micro is providing the Nitrogen and the Mg in the proper balance, thus
there is no need for the Grow formula and little or no room under the
'acceptable' PPM limit of 1600 @ 0.7 conversion.

Expected PPM levels:

At .5 conversion:
0-4-8 = 473ppm
0-5-10 = 592ppm
0-8-16 = 947ppm

At .7 conversion:
0-4-8 = 663ppm
0-5-10 = 829ppm
0-8-16 = 1326ppm

Addback Calculator (For Advanced Users)

Say you were running the 0-8-16 formula, at .7 conversion with a 22
gallon res. When you first fill it up, your ppm will be 1330.

Now you have been growing for a week, and some of the water has been
taken up by the plants, some has evaporated, and now your res is at
947ppm. You need to get your ppm from 947 to 1330. Here is the
equation:

((target-current)/target)*8 mil's per gallon*res gallons = micro
double this figure to get bloom mil's

Example:
((1330-947)/1330)*8*22
(383/1330)*8*22
0.3*8*22 = 53 mil's micro

53 mil's micro double that and get 106mils bloom. So 53micro and
106bloom to add back to your 22 gallon res to get you from 947 to
1330.

edit: sorry this is the hydroponic formula

 

[baccas125]

Thanks for the input!!!

 

[blackfin]

bump

well i have GH nutes (micro and bloom) because i was going to do Ebb & Flow, but someting came up and i can't get the table, yet, and i'm going with soil again...but with only a little bit of pure blend pro, i might need to resort to the GH for soil....

i have also look high-and-low and can't find the formula for soil.... the soil is not heavily ferted, it's wal-mart brand Expert Garden soil

thank you,
bf

 

[blackfin]

my tip for medium like promix, is to use GH at 1/3 strength, with every watering, (2ml micro, 4ml bloom per gallon, or FloraNova @ about 2ml/gal, target EC of runoff no higher than 2.0) because I fear it is too strong if the soil is not properly irrigated to prevent nute accumulations in the medium. Same applies to the Metanaturals formula of 10a-10b, drop it to 3a 3b

well i found something.... i don't have experience with Promix, i think it's just a fertless peat based medium and perlite.... which is basicly what i have from wal-mart so ya'll think this will work, only using 1/3

thanks,
bf

here's to lucas for all the work he's put into getting simplified nute formulas :friends: thank very much