Leaves showing problems again.Got Pics. NEED HELP!!!

ok another newb question/problem here...OK so my plants are now 3- 3 1/2 weeks old, about 5-7 inches tall, and ranging from 5-7 nodes. I had a nutrient burn problem before from using nutes to early and too much in seedling stage. That problem was diagnosed FEB 12 with the help of the guys on here.I did not do a complete flush of the plants just stopped adding nutes... From that I stopped giving nutes and just watered plain water with some SUPER THRIVE because I transplanted from 16 oz cups into 2 gallon pots. I cut off the first dead leaves that had the nute burn. Observing plants everyday, Today I noticed 4 of my plants showing new signs of problems on newer developed leaves rather than the first leaves like I experienced the first time when I had nute burnt leaves. One plant has a leaf that looks like it was eaten, but my grow box is clean and no signs of bugs???? The other 3 show signs of some kind of deficiency,lock out,burn I dont know. The plants seem to be growing fine with new growth bigger than the last and gaining height everyday day or 2. I am growing under CFL's, in Pro Mix HP Soil mixed recently with Worm Castings, not using any nutes just plain phd water between 6 and 7 ph (though I did do a watering where the ph might have been less than 6 maybe around 5.7) Temps are between 71-76 during lights on and 65-70 during lights off.
Please help
Thanks in advance
Got close up pics of the Problems and pics of the plant so you can see how the whole plant looks
PICS 1-4 & 10,11 are of the whole plant
PICS 5-9 are of the problems

Thanks Again

It looks similar to problems i had in the promix hp from letting it dry too much. I really don't think the soil less mixes want to dry as much as people are used to in soil.
What nutes were you feeding? 10 days without food, it might be time to add a light feeding.

Another thing to consider is the difference between immobile nutrients and mobile nutrients in the plant. If the plant has enough mobile nutrients to keep growing it will, but without new nutrients supplied from the ground that are immobile in the plant the plant will start showing signs of deficiency on the new growth - in contrast to the burns you mentioned earlier on the old growth.

I thought pro mix hp means full strength nutes all the time unless u see real signs of fucked up shit. And a ph of 7 I think is way to high in a soilless. I don't see any real problems with those leaves. Those plants look great. Yea a little this or that, I see it. And some one mentioned calcium problem, I also thought I was a good idea to run a little cal mag in a soilless. Pretty sure I'm right about this info. But let see what a few others say.

Calcium or nitrogen

Ok I thought it might have been a deficiency...I was holding off on the nutes because of the nute burn problem I had earlier...so I guess it would be safe.to add nutes at quarter strength. I'm using dnf full line. another thing ... I didn't think pro mix was a soil less mix since it has soil and pertile. So is it nute deficiency? Can I start adding nutes again

soil has sand, silt, clay, and a few other components. http://en.wikipedia.org/wiki/Soil Promix hp has none of these. peat isn't a form of soil. I was very confused about this for a while. there don't seem to be too many definitive examples, but from what I can tell in soil there are many smaller spaces between soil particles (which is why I think it is more important to let "soil" dry more than soiless mixes); also, there is often times either a mineral reserve of nutrients or a source of organic material (OM) that provides nutrients as well (somehow I've seen a few places that say to incorporate minerals or OM, so this seems to blur the line a little more).

http://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soilless-growing-mediums.htm here is a random page that gives info on soiless mixes and their components. Im sure there is a lot of info that can be found, but all the info seems to be rather general when distinguishing between soil and soilless. The main thing that seems to be consistent with soilless mixes are the components; it almost seems to be what the definition depends on. The most common components seem to be peat, coco, perlite, vermiculite, and sand (so no clay or silt).

some sights mention soilless mixes are sterile; the pro mix hp that I use is inoculated with mycorrhizae so it definitely isn't sterile. I haven't found consistent practical application that defines "soilless" mixes as sterile, especially when people run organics in a soilless base.

I think you are safe to use some nutrients at this point. I really think you are safe to add 1/4 strength.

calcium and magnesium are the most common deficiencies I've seen with soilless (coco is the worst for this). But since it is so common I think this causes people to be quick to jump to these deficiencies as a source of problems. If it is the problem it can take two weeks for the plant to bounce back from magnesium def.. Calcium deficiency will correct a little quicker (mainly by making other nutrients more available again).

But if it isn't the problem, you will only start pushing things out of balance more and more by adding too much of what's already there. So be careful when adding a lot of additional supplements.

All right gotcha . thanks for the help. So now that I know I'm growing in a soil less mix and not soil, I can make the necessary adjustments. So for my pro mix hp is a ph of 6 - 6.5 right ? Thats what I read for soil less mixes? ? Any other adjustments that I should make. I added nutes last night at 1/4 strength. Should I add something like cal mag or another kind of additive for calcium and magnesium? ? Or just keep feeding without cal mag and let plant recover?
Thanks again

illa101k2 said:

All right gotcha . thanks for the help. So now that I know I'm growing in a soil less mix and not soil, I can make the necessary adjustments. So for my pro mix hp is a ph of 6 - 6.5 right ? Thats what I read for soil less mixes? ? Any other adjustments that I should make. I added nutes last night at 1/4 strength. Should I add something like cal mag or another kind of additive for calcium and magnesium? ? Or just keep feeding without cal mag and let plant recover?
Thanks again

Click to expand...

No, get some some Calcium I don't rlly Think Mag is neccesary, but it wouldn't harm if it got some more of that.