Plant deficiency with pictures. Help please

400w HPS,Drip to drain, foxfarm grow big-1/2 nutes,PPM 717,PH 6.4,Temp 75, HUM 60

These are 20 days into veg

For the first week of veg i was using R/O water. I didnt realize that i needed cal-mag+ and my plants suffered from lack of nutrients.

After that first week i started using cal-mag+ my plants started improving slightly. Now they still show signs of deficiency but not as bad.

I circled the leaves that were effected the most and i just had a few questions.


1)Should i clip the leaves circled in black? Will this give light to healthier vegitation underneath it?


2)Does it look like i should use a higher doseof cal-mag+, even the new veg has some signs of burnt tips.


3) The kandy kush on the right is perfectly fine. However the Super Lemon Haze on the left is burnt. Any opinions on that?

Thanks Guys

Looks like nute burn to me.

Lolz - I just posted this on another thread.


http://www.drugs-forum.com/growfaq/97.htm

http://www.marijuanapassion.com/forum/attachment.php?attachmentid=158412&d=1295751999

I have two varieties growing in the exact same conditions, same thing, some plants get a slight burn, the rest are as happy as pigs in poop.
It just must be that one strain is more sensitive than the other.

I just remove the dammaged leaves when they get bad. Elsewise, I don't do anything.

Thanks for your help and reply Hugo.

Do you think i can go ahead and pull the leaves circled in black in my picture?

Anyone else reading this feel free to add a comment on this idea or help answer any of my other questions, i appreciate all the help.

Hey OS, go ahead and cut them off if you want, losing a couple of leaves won't hurt the plant (just don't go overboard).

no dont cut the fan leaves, thats a minor nute burn, they are still working, at a reduced capacity, but they still work!

up the micro nutes, lower the nitrogen a bit. dont flush or anything, just add water+micro nutes to the reservoir or whatever, and dont add any growth nutes, wait about a week, and it should have worked its way back into balance.

ok so what exactly should i do as far as micro nutes. Iv only been using FoxFarm Grow Big and adding cal-mag+ in my rez since the start, thats it.. no other nutrients. Should i have been adding some othrer nutrients in this whole time? If so what do i need.

Thanks for all your help