lucas formula ?

**LearyRed** · 05-18-2012, 12:14 PM

I retweaked the Lucas Formula for my own use.

Someone was talking about how the formulations backwards. If you read it, it seems to make more sense that lucas's bloom ratio be used to veg, and vice versa.

Here it is.

If you actually look at the analysis of GH FloraBloom and Flora micro you would see that Lucas was back ass back wards when he came up with his formula. He advised two parts Bloom to one part Micro. If he would have gone with two parts micro and one part bloom he would have gotten a ratio of 3.3, 1.6, 2 but it would have a mess of calcium at 333 ppm. That high calcium would mean that the reservoir s would likely have to be changed out weekly rather than going for weeks or a full grow by just adding water and more nutrients.

So on this advice I tweaked it for myself. I went with a roughly 4:3 Micro:Bloom, at 4ml Micro, and 3ml Bloom a Litre for veg, and reversed it for Bloom.
Which gives you an NPK of roughly 20-15-16 for Veg and 15-20-19 for Bloom

It's a bit heavy on salt, and a little low on Mg, but it gets the job done right off the shelf. Although mine would randomly show slight nitrogen deficiencies from time to time, very slight, like a day or two of light colored leaves.

**guerrilla medic** · 05-18-2012, 12:44 PM

i do the exact same thing. 4:3 micro to bloom from clone till 3 weeks into bloom, then 4:3 bloom to micro the rest of the way. no boosters or additives. change out every 7-8 days. blows shit up.

**LearyRed** · 05-18-2012, 11:58 PM

Originally Posted by guerrilla medic

i do the exact same thing. 4:3 micro to bloom from clone till 3 weeks into bloom, then 4:3 bloom to micro the rest of the way. no boosters or additives. change out every 7-8 days. blows shit up.

Ya it's pretty badass for a quick off the shelf mixture. Just have to watch that you don't lose any water or your EC will start to rise quick. I don't even check it anymore though, just water it hempy bucket style from the top, until some drains out the side hole.

Works wonders.

**oceangreen** · 05-19-2012, 08:05 AM

Originally Posted by LearyRed

Ya it's pretty badass for a quick off the shelf mixture. Just have to watch that you don't lose any water or your EC will start to rise quick. I don't even check it anymore though, just water it hempy bucket style from the top, until some drains out the side hole.

Works wonders.

hmm 4:3 ratio.. I am using 1:2 at the momentt aka the original lucas. Should I switch to your style? Convince me a bit more... as I am having some issues

**problemsolver** · 05-19-2012, 08:30 AM

Originally Posted by oceangreen

Do you use RO water

Any pure water source will do. It can be distilled, ro, di or ro/di.

**budsMI** · 05-20-2012, 08:01 AM

I use lucas with dyna grow... IMO you cant beat it... I wouldnt grow any other way... Ebb n Flow... 1000 ppm perpetual..

**oceangreen** · 05-20-2012, 11:07 AM

Originally Posted by budsMI

I use lucas with dyna grow... IMO you cant beat it... I wouldnt grow any other way... Ebb n Flow... 1000 ppm perpetual..

Why Am I the only one having problems with lucas??

**oceangreen** · 05-20-2012, 11:15 AM

Originally Posted by LearyRed

I retweaked the Lucas Formula for my own use.

Someone was talking about how the formulations backwards. If you read it, it seems to make more sense that lucas's bloom ratio be used to veg, and vice versa.

Here it is.

If you actually look at the analysis of GH FloraBloom and Flora micro you would see that Lucas was back ass back wards when he came up with his formula. He advised two parts Bloom to one part Micro. If he would have gone with two parts micro and one part bloom he would have gotten a ratio of 3.3, 1.6, 2 but it would have a mess of calcium at 333 ppm. That high calcium would mean that the reservoir s would likely have to be changed out weekly rather than going for weeks or a full grow by just adding water and more nutrients.

So on this advice I tweaked it for myself. I went with a roughly 4:3 Micro:Bloom, at 4ml Micro, and 3ml Bloom a Litre for veg, and reversed it for Bloom.
Which gives you an NPK of roughly 20-15-16 for Veg and 15-20-19 for Bloom

It's a bit heavy on salt, and a little low on Mg, but it gets the job done right off the shelf. Although mine would randomly show slight nitrogen deficiencies from time to time, very slight, like a day or two of light colored leaves.

4ml micro to 3ML bloom per liter??? that 16ml mirco to 9ml bloom per galoon??? How are you not getting burn....... I am getting burn at 1/4 Strength Lucas.....

**guerrilla medic** · 05-20-2012, 12:07 PM

im not using 4ml to 3ml. im using a 4:3 ratio. you use whatever ec your plants are comfortable with, just keep the ratio. i use 8 ml to 6 ml micro/bloom by 8-10 days into veg and go from there. i feel like it would be impossible to burn plants at 1/4 strength lucas. how far along are they?