This is courtesy of .... Snaps_Provolone

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.

All courtesy of Snaps_Provolone