NITROGEN DEFICIENCY ??

[volak]

Would everyone agree that these young plants are showing signs of N deficiency ?

They are about a month old from clone, only been in DWC for 4 days under 600w HPS, PH fine (5.8) room temp 27c, nute temp 20c, good air circulation.

They only started to yellow last night.

volak Reviewed by volak on 05-08-2009. NITROGEN DEFICIENCY ?? Would everyone agree that these young plants are showing signs of N deficiency ? They are about a month old from clone, only been in DWC for 4 days under 600w HPS, PH fine (5.8) room temp 27c, nute temp 20c, good air circulation. They only started to yellow last night. Rating: 5

[volak]

i use general hydroponics flora series nutes.

15 ml grow
10 ml micro
5 ml bloom
per 10 litres of water.

Also use PYTHOFF as a precautionary measure.

[volak]

Anyone ? Anyone at all ???

[Greenthing]

They look nice if they were mine i would increase the strength of the nutes a little bit for the ones that are light green, carefull not to over do it though.:hippy:

[volak]

Actualy, you know what i think it was..

..the guy came around to fix my comp, so i flicked the switch on my growroom..thing is, i forgot to flick it back on again, so they were without light for over 24 hrs.
I know that in the past, if the lights have blown..undetected for a few days..the lack of photosynthesis turns them pale after a day or two.

I wouldnt have thought that 24 hours darkness would have affected them much, but the pics speak for themselves..and i hav'nt icreased the nute level yet..im going to though, coz they still look a bit anaemic to me.

[volak]

looking at those latest pics, now ive posted them..they look exactly the same. lol.

i must be wasted.

[volak]

OK...im propper panicking now..take a look at these pics.

I raised the nute level to..

30ml grow
20ml micro
10 ml bloom

PH has been kept between 5.5 and 6.2

As you can see, they are starting to get very yellow on the tips and side margins..and some are showing chlorosis in the inter veinal areas.

Looking like either Zinc, Iron or Magnesium deficiency.

How can this be when all the various nutrients are available and the PH is fine ? I have ruled out heat stress too as i have a coolshade lamp.

I have been using the PYTHOFF too.

Any opinions would be greatly appreciated.

[syde00]

let me start out by saying i know nothing about hydro grows.

with that being said, IMHO, you are seeing the starting stages of a little nute burn, which would make sense since you just said you increased nute levels.

also... pic #3

is that 2 plants in the same bucket? if so, that is bad, and is going to cause you more problems soon.

[phatsesh101]

the first ones look kinda like burn nut the bottoms dont
i think rustys sig has form fill it out so as to limit miss information cause there are several posibilites at this point and if your serious about ur plants

[justanotherbozo]

i'm no expert bro but i agree with Greenthing, that first set of pics just looked
a bit hungry.

now it looks like nute burn as syde00 suggested.

unfortunately, i'm not experienced enough to give you a definitive answer.

so i'd suggest you fill out the troubleshooting form located in Greenthing's sig.

then, hopefully, Rusty or Stinky or Stitch or one of the other more experienced
growers will be able to more definitively answer your question.