Nitrogen Deficiency?

[purpleskunk777]

Hi all,
My plant is in week 3-4 of flowering and i've been seeing significant yellowing throughout the plant (lower, upper, middle nodes). the yellowing was primarily localized to the fan leaves (which are almost completely gone now due to this) and is now moving to the bud sites. I tried foliar feeding miracle grow all purpose to the fan leaves along with liquid karma at 72 deg. ambient temp. (maximize absorption b/c stomas are primarily open during this temp.)
Also, i should add that i recently transplanted from 1 gal to 3 gal pots 3 days ago. let me know what you think! thanks!

Soil = Scotts Premium Potting soil (contains timed release nutes)
Indoor
Additives = Liquid Karma
Runoff pH = unknown
Use pHâ??d tap water
Age of plant 3-4 months
Lighting source = 400W HPS 16+ inches above canopy
Air temperature = 68-80
Air % Relative humidity = 40-60%
Lighting schedule = 12/12
Type of ventilation = 170 cfm/carbon filter from htg supply

[bobjob4u]

A pic. would help. Scotts premium will work great. It is buffered so ph stays around 6.8. But after some time it loses it buffered ph. Also no need to feed much in that soil. It has nutes already.I used it for years before going to another product. It will work if you take it easy with nutes. Its hard to say witout pic or more info. I think folar feeding can burn plants aswell.

[purpleskunk777]

here are some pics...the yellowing started a while back and seemed to get slightly better when i added some MG all purpose @ rusty's suggested strength. i recently foliar fed MG (as stated above) but am hesitant to add anything else to the soil b/c scotts has some timed release in it as bobjob suggested and don't want to burn the plant. help please!!

[bobjob4u]

To be honest i cant give a straight answer. I have never had any look like that. I am not a big fan of folar feeding. What did rusty say? He is the man to ask. When was the last time you feed through soil? Also I would start by checking the ph. Get a ph pen at your lawn and garden center.Your soil been around 3-4 month. That is the life span for that soil. Nute should be used up and ph could be starting to waver on you. If you can when you pot is dry .Water with proper water till constistanly moist. Try to catch the run of water and get the ph of that. If that is good then i would give it them some nute. Thats if you havent over feed them. Maybe somone else could jump in and help..:thumbsup:

[bobjob4u]

try this link maybe this can help

Cannabis Plant and Pest Problem Solver - Pictorial - 420 Magazine (http://www.420magazine.com/forums/frequently-asked-questions/81266-cannabis-plant-pest-problem-solver-pictorial.html)

[purpleskunk777]

Rusty what do u think?!?? help me like you did with my other plants lol :)

[purpleskunk777]

Bob-
I've been giving them plenty of nutes. gave them some super-thrive yesterday evening as well. since i transplanted them 5 days ago i've been taking it easy on the nutes as scotts premium already contains plenty of ferts. (timed-release too).

btw where'd you get your figure of 6.8 as the buffered pH for scotts premium? experience? read it elsewhere?
thanks,
-purp

[bobjob4u]

Cause every time i used it my ph pen average 6.8 .somtimes a bit lower 6.5 . So 5 years of experience.

[purpleskunk777]

awesome...i was looking everywhere for that info. but couldn't find it (pH of soil). glad to have so many experienced ppl here to help me out...

[purpleskunk777]

the problem has gotten much, much worse. I'm afraid I screwed up big and the plant's going to die. please help someone!!
Runoff = 6.0 in, 6.0 out with Gen. Hydroponics pH test kit...
Changes i made today:
-mixed in some dolomite lime (about 2 tsp to 2/3 pots) with the top layer of soil.
-watered (6.5 ph) water with 1/4 tsp of grandma's unsulphured molasses in hopes of making Nitrogen in soil more available to plant, as nitrogen seems to be locked out for some reason other than pH (can't be locked out at 6.0)
again, any suggestions would be greatly appreciated!
-not adding any nutrients to soil for a several weeks because there is supposed to be some in the soil i transplanted in 2 weeks ago. perhaps i should try adding nutrients?

[polishpollack]

If the entire plant is yellowing, I'd say it needs to be fed something. Personally I don't feel comfortable using Miracle Grow stuff, but if I could make a suggestion, go to a hydro shop and get some Dyna Gro 7-9-5 and use one half teaspoon per gallon of water and give them that. Your potting might have some ferts to it, but it doesn't look like it has much. Superthrive is just vitamins and hormones, so don't expect much help there if the problem is what I think it is - low nitrogen. molasses won't do much either. It's really more for soil that has beneficial bacteria in it and I doubt if your soil does. I might be too late now to save them, unfortunately, but give it a shot if they aren't dead yet.

[headshake]

purpleskunk, where did the yellowing start?

what potting soil are you using?


-shake

[purpleskunk777]

Shake-
I'm using Scotts premium potting mix.
The yellowing began towards the bottom of the plant and worked its way throughout the middle/top over the course of 2-3 weeks. The yellowing is characteristic of a N deficiency, working its way from the outer edge of fan leaves towards the inner leaf, then flowers.
The flowers themselves appear to be affected only slightly, as of yet.

[Dutch Pimp]

Runoff = 6.0 in, 6.0 out with Gen. Hydroponics pH test kit...
Changes i made today:
-mixed in some dolomite lime (about 2 tsp to 2/3 pots) with the top layer of soil.
-watered (6.5 ph) water with 1/4 tsp of grandma's unsulphured molasses in hopes of making Nitrogen in soil more available to plant, as nitrogen seems to be locked out for some reason other than pH (can't be locked out at 6.0)


6.5 -6.9 ph is ideal for soil...IMO.

[purpleskunk777]

thanks dutch,
my soil might've actually been too alkaline ..i junked the old GH ph test kit and got a pH pen, which is much more accurate. have been watering with acidic water to slowly lower the pH and theyve been looking a little better now, a week later.

[darealbrain]

try reading my thread about stronger plants.if you try this many of the problem you are having will disappear like magic.what were you feeding the plants during the transition from veg to flower?more than likely thats what started all your problems.the plant was happy with what you were doing then all of a sudden what the fuck.some things that we do to plants take alot longer to show up than you think.its not always the last thing you did maybe what you did before then

[purpleskunk777]

thanks dareal....the dolomitic lime in addition to adding FF TB and molasses helped quite a bit. the plants are completely recoevered now and thriving! :D
i will indeed read your thread. thanks for the input :thumbsup:

[darealbrain]

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