Lucas formula... deficiency...I have pics

I have 5 clones(trainwreck, Blue Rhino and a chemdawg) all in an ebb and flow system together with a 400 watt mh. The table floods and drains 5 times a day and I just recently started using the Lucas formula at a diluted ratio of 2/4 ml per gallon a couple days after transplanting and have kicked the ppms up a little bit more to about 400 ppm now. I am using Ro water and my ph has been within 5.5 to 6.0.

I have noticed my tips have been turning up or down and yellowing on some of the plants. Maybe a mg deficiency? After reading the original Lucas forum it says he starts all his clones at an 8/16 ratio which would come out to about 600-800 ppm @.05 or 1100-1200 @ .07. Am I having problems because I started off at such low ppms? Should I flush then kick my ppms up to whatever a 8/16 ratio per gallon would be and just measure it out???Any advice would be very helpful as I feel my bigger clones are yellowing alot more than my smaller ones so I figured they might just need a high concentrate of nutes than what they are receiving????

That is a tip burn from too much fertilizer. How much bloom and micro are you using per gallon?

hardly any..my ppm is at 446 at .5 conversion If I had to work it out into an equation it would be at 4 ml micro / 8 ml bloom. I am thinking I dont have enough nutes and need to actually use the 8/16 equation I believe I should have started from the beginning.

You're feeding at .9 EC and I'd suggest you lower that to .7 EC until you start flowering.

dont add more your plants are telling you that you are feeding to much.
and lucas has 2 feeding formulas. I think for now you should use his lower
feeding mix.

Lucas Formula for seedlings/cuttings

For young plants (< 4 weeks old) or cuttings, which may not be able to handle a full strength feeding formula, may require that you dilute the nutrient solution before feeding. This is OK, just make sure you keep the correct ratio when mixing. For example, 50% strength would be 4ml Micro and 8ml Bloom

hellraizer30 said:

dont add more your plants are telling you that you are feeding to much.
and lucas has 2 feeding formulas. I think for now you should use his lower
feeding mix.

Lucas Formula for seedlings/cuttings

For young plants (< 4 weeks old) or cuttings, which may not be able to handle a full strength feeding formula, may require that you dilute the nutrient solution before feeding. This is OK, just make sure you keep the correct ratio when mixing. For example, 50% strength would be 4ml Micro and 8ml Bloom

Click to expand...

Thats what I have been feeding them...to get my 400 ppm at .5, Then when should I be increasing nutes? I was under the impression this is from possible under feeding

you dont get that from under feeding, under feeding looks alot different. its a light burn could be caused by a PH issue,
you shure your pen/meter is cal. right? you could do a flush to be safe. eitherway you need to feed less

ok, I guess I started to confuse myself....I started off my grow at a 2 ml to 4ml lucas formula and my plan was to slowly raise it up to proper levels 600-800 ppm 8/16 ml per gallon normal formula. After reading the orginal ask lucas forum http://www.cannabis-world.org/cw/archive/index.php/t-892.html I read a thread on it that said to start vegging at 8/16 under HIDS immediately the clones have rooted. When do I want to ramp my nutes up??? Should I have started with the 8/16 ml per gallon formula right from the start??

what work for him and others doent allways work your you or I. they need less

fair enough, then when do I need to raise my nutes? Its my 3rd week of nutes at 400 ppm .5. Should I be adding cal mag?

killa killa kk said:

fair enough, then when do I need to raise my nutes? Its my 3rd week of nutes at 400 ppm .5. Should I be adding cal mag?

Click to expand...

Why are you in such a hurry to 'raise your nutes'? More nutes does not equal more yield or a better product, it actually works the other way around.

no rush at all, Just confused because I read that I should have been using 8/16 from the start not a partial strength nute so I was thinking since the burn is only occurring on my bigger plants I figured it was a lack of nutes and I should have started off at 600 to 800 ppm @.5 using the 8/16 ml per gallon method...

8/16 is too strong for any of the 6 strains I have right now. I'd go with something more like 5/2 in veg with RO water and 5/14 in flower, you can call it 'the homebrew formula' .

homebrewer said:

8/16 is too strong for any of the 6 strains I have right now. I'd go with something more like 5/2 in veg with RO water and 5/14 in flower, you can call it 'the homebrew formula' .

Click to expand...

nice I like it!! homebrew lol