Need help with a Manganese Toxicity problem

[broski]

what do i do?

broski Reviewed by broski on 05-13-2008. Need help with a Manganese Toxicity problem what do i do? Rating: 5

[broski]

Grown in soil
Indoors
3 parts foxfarm organic soil
1 part perlite
1 part worm castings
all good name brand stuff
Tap water from bathtub ph unknown
mothers are approx. 8 months old
Sporadically use botanicare pro blend veg+liq.karma
rate of application: 1part nute 2part plain waterings every week
Flush plants every 2 months w/6 gallons plain water ph unknown
400watt metal halide 12inches away from canopy
Day temperature: 70 no humidity
Night temperature 60 to 65 low humidity if any
18 on 6 off
100cfm bathroom fan [always on] for exhaust
5000btu a/c [always on] for intake

[broski]

bump help! please help! must save my mothers

[grey1223]

Just flush them good and then give 1/4 dose of ferts. They should come around in couple days. If you have or can get some Clearex rinse with that. It works great any time my moms show stress.

[Rusty Trichome]

Very difficult to diagnose with no pix, but looking at your parameters there's a few questions needing answers...
Is this a new problem, or one that you've been dealing with for a while?
How did you decide it was a manganese problem and where did the excess manganese come from?
Can you get a ph meter or kit? I'd look at the ph as possibly being a main suspect causing your un-indicated problem. (you didn't tell us what the plants are doing or what they look like)

It's usually best to keep a steady nute schedule going. Also, you may want to mention what kind of nutes you consider "good name brand stuff", as there's plenty of "good name brand stuff" that is not very good for growing cannabis. Makes it easier for those that have experience with that product line, to help you with application rates and schedules. :thumbsup:

[broski]

Rusty T, 1st off, it is not a new problem, had the same problem last crop with a hydroponic batch of the same exact genetics, same set up with no humidity but temperate temperature's. I thought it might be a problem with mg, but I used this website and mostly my jorge cervantes growbible to diagnois it, its says its compounded by low humidity, having none is worse i would think. In severe cases it causes deficiencies in iron(which happened) and i believe thats what caused her death and we had to put her down. Flushed them very good with tap water, ph unknown(gettin a nice electronic ph meter soon. ANY SUGGESTIONS? read that the hanna ones are crappy) When the leaves have to transpire more b/c of the lack of humidity, the manganese gets locked in. Recently moved them back to a room at 78*farenheit with 50% humidity and with a good flush and some 5mg per gallon (1/2 strength)of Botanicare Liquid Karma for the foliar feeding i do once a day. They are looking way better with green growth.

OH YEAH... When i said i used name brand stuff, i meant the perlite and worm castings i mixed in with the foxfarm organic soil. My last crop was my first in soil and it worked out but we had humidity, no we dont which im worried about and am gonna fix soon. I use BOTANICARE PURE BLEND VEG plus LIQUID KARMA.

The new growth had black spots which looked just like a mn problem, most likely a toxicity of it, but the bible does not say how to treat it, i knew i had to flush but was looking for something more cause they are my pride and joy and i dont want them to suffer anymore. But ya they are looking so much better now, 2 of 3 survivied but only one really survived without much leaf loss. The ph of the soil might be a problem but i dont think so, no other deficiencies have ever plauged me and its only in the older plants and not the young ones which makes me think its a toxic buildup of Manganese which makes sense but im not sure. This is my 7th crop and never had any problems with any.

Would love some help with using the BOTANICARE PURE BLEND PRO line of nutes and the app rates, BY THE WAY.....i use it once every 2 weeks or so with them(veg+liq. karma) so i got a feeding regiment, been reading that less is more and might have over nuted some hydro organic crop i had in the past, using the soil line of botanicare now, but am switching over to SUNLEAVES BRAND INDONESIAN BAT GUANO tea diet instead of the botanicare products, do you recommend anything with that, need some help & advice on using guano's in flowing, im on the 1st wk of flowing, what should i do, also got some liquid diluted seaweed, can i use that? In a article written in high times by soma from soma seeds he says he uses brown and black seaweed extract from wks1-3, then a guano tea from wk4-7 with a 2 wk flush, what do you think about that? Your help is greatly appreciated and the good karma will be passed on to you one day. Thanks.

[Weedhound]

Pics would help greatly.....sounds like straight overnute and/or fert build up just from the specs.

Flushing IS the answer....and fyi....almost ANYTHING "toxicity" should be treated with a good flush.

[Weedhound]

YOU PUT HER DOWN?

Down where? Just kidding......sorry to hear it.