Marijuana Plant Problems
Guide to Nutrient Deficiency or Toxicity in the
The Grow Room forums; hey i have to unknown strains(random bag of seeds ) that are a bout 3-4 weeks into flowering. im using ...
07-19-2012, 03:45 PM
hey i have to unknown strains(random bag of seeds) that are a bout 3-4 weeks into flowering. im using a 70 watt hps light about 18" from the tops of the plant. and an oscilating fan to help lower the heat IF thats part of the problem. ive been trying to diagnose it for a week or so now and cant figure it out. any help would be great! the leaves are slowly starting to feel crispy the tips or starting to go yellow/black as well as the edges of the leaves as you can see in the pictures. also the edges and tips are curling upwards.image (3).jpgimage (4).jpgimage (5).jpg
07-20-2012, 08:22 AM
So we really need to balance everything regarding the proper handling of plants? I sometimes find it tormenting but seeing them healthy growing, it's then enough for me that to wash away that certain feeling.
07-20-2012, 03:32 PM
Learning How To Roll
Learning How To Roll
Please help me treat this Mg/Ca deficiency?
So My ladies are in the 35th day of flowering. basic info: 600W HPS, 5x5 tent, soil, room temp is steady at 75F, humidity 50%. Its well ventilated, has plenty of fans going. I started to notice some spider mites a few weeks back and I used some mighty wash & habanero pepper spray to rid my plants of those guys. I thought that's what was causing the brown spots on my leaves. Bugs are now gone! but problem is getting worse with leaves...
Turns out from what i have been researching that its a possible deficiency?
I feed with tap water (out of tap water is PH of 7.8 or so, I get it down to 6.5 PH though every time). runoff is about 6.5-6.6ph so thats all good.. My water is around 400PPM+ TDS, I thought that hard water had a lot of Mg and Ca in it though.. So im confused as to why this would be the issue. Should I start using distilled water instead of tap water? I do feed with 1/2 strength nutes (florabloom), so im not just using plain water, these bad boys seem to have been growing fine except for the brown spots on the leaves, and then leaves turn yellow and are basically just falling off without wilting.
I have already fed the babies once with Epsom salt (1/2tsb per gallon x 2 gallons), should this start to help out? Do I feed them more Epsom salts until the problem is fixed or do i only feed once? I dont want to hurt the plants. I also thought about just trying some earth Juice and trying to fix it. or Cal n Mag. guy at the grow shop sold me some Plant Success Mycorrhizae (http://www.4hydro.com/nutrients/myco...e-granular.asp). He told me not to worry about the earthjuice or cal n mag yet.. What do you guys think? Im SURE the bugs are gone. The leaves are turning yellow also and are just easy as hell to pull off. not really wilting but just coming right off. Help a brother out!
07-21-2012, 07:07 AM
70w HPS? you mean 750w?
Originally Posted by kronikkush420
from what i can tell, heat stress! during veg, you can mist them. i try to not do that during flowering tho, crank up the ac, or cut back on the light schedule, an hour or so, or more fans
07-21-2012, 07:11 AM
its practice dude. theres no set amount of nutes a plant needs. if it grows faster, it needs more nutes. if its cold, it needs less water and more nutes. hot temps are more water, less nutes. big plants need more then small ones. you just gotta have some confidence and not freak out. i see a nute toxicity/deficiency on one of my plants and im like, ´eh, ok´ and fix it. its all about trying to stay 1 step ahead of issues, and being prepared, with plenty of nutes, ph testing supplies, extra bulbs, fans, wires, electric tape, whatever.
Originally Posted by Joshue
it gets pretty boring after a few years. non-eventful really. just second nature i guess, you just look at them and know one needs more N, the other needs less N, this one has some bug, that one needs to be rotated, tie this one down, top that one. whatever.
it gets easier. staying high helps too.
07-21-2012, 07:21 AM
well i cant say anything about mites, cuz i dont see them
Originally Posted by secretsparty
but pic 1 looks high on N (look at the top right leaf, that shit is too dark), low on P, K.
pic 2 id bump up P and K, and micro nutes, but that ones doing.... ok...
pic 3, 4, 5, hard to tell cuz everythings yellow, but yea add P and K, and micro nutes.
pic 6, 7, 8, thats just sever deficiencies. add nutes.
if your in flower, you really dont need much of N, but the amount of P and K ya need is very very high. when the plant doesnt get it from the roots, it sucks it out of the fan leaves, to still be able to grow buds. the fan leaves then act, instead of solar panels, as batteries, and if your deficiency is high, your batteries get drained.
hard water?? sure, it has more crap in it, but who knows what! dont assume the reason its hard is becuase of a nute you want it to have. it could be hard due to salt, flouride, chlorine, chloramine, ammonia... and whatever else they put in it.
I remember seeing those commercials for truth.com or whatever that talked about the 100s of chemicals in cigarettes and the water in DC had the same shit in it. tap water sucks. i fill up huge containers, let them sit for 3 days, then add nutes.
if your really worried about the water, go to a pet store. i swear, fish and pot need the same damn things.
get a bottle of water additive, the chlorine/chloramine removal stuff.
get a bottle of 6.5 pH buffer
get a bottle of plant food for tropical plants, its 0-0-0 but has like 15 micro nutes in it.
get a pH kit.
those 4 things together might be 30 bucks?
if its safe for fish to swim in, its probably safe for us to smoke... granted i still stop everything (minus sugar) 2 weeks prior to harvest.
Overall tho, cut down on N, pump everything else up a bit, gradually, til ya see the dead spots not forming anymore.
07-28-2012, 04:16 PM
Weed vs, arithritis
I have RA is weed good or not so good for it?
07-29-2012, 10:35 PM
Best thread for in detailed information even compared to other forums
08-04-2012, 07:20 PM
08-06-2012, 04:36 AM
it would help you out
Originally Posted by Pencil Slim