I posted the below on icmag for some additional insight so some of you have already heard some of the info but theres new stuff and i need new help, I've tried numerous suggestions on this site from just watering with water and b-1 to lowering nute ppm down to 400-500, ph down to 5.6-5.7. Nothing worked. Please read below and offer any suggestions, I'm serious about the reward and any of you who have dealt with me know I will stand by my word. Thanks in advance.
So we have some major issues with our sealed room mpb buckets, I'll give you a list of materials, nute regimen and past failed diagnosis to see if anyone can help, we're in a bad spot at this point.
Materials:
5 ton Excel Aire AC
12k hps/MH mixed exposed vertical bulbs
10-23 gallon mini res's
2 hi blow 80 air pumps running 2 stones per bucket
2 ton chill king chiller keeps water temps at constant 66-68
3.5 gallon buckets with grow rocks in mini res lid
2-1800 gph pumps for filling res's
2-1500 gph for drip
4" return line
210 gallon main reservoir, well aerated
Intellidose ph monitor and doser
CO2 burner with soletel monitor
Temps remain constant at 78 daytime with 72 night time, 18 hours on, 6 off.
Nutrients- PPM at 600-800 pH 5.7-5.8
AN Sensi A&B
Roots excelerator- H&G
Multizen- H&G
Algen- H&G
Cal Mag
So initial diagnosis after dealing with some other snafus, was cal mag deficiencies, phosphorous and some other potentials. We did a flush with 200 ppm well rounded solution then started back with low 450-550 ppm feed. No change what so ever. We lowered the CO2 ppm to around 700, not much above ambient air. Did a light top feed with a light liquid kelp, small signs of improvement but short lived. The plants are growing, nowhere near the rate they should and deficiences/toxicity continues. This is now round 3 and same thing keeps happening. The more sativa like plants seem to show a more intense yellowing on new growth, turning to almost completely yellow. At first it looks like a manganese deficiency but progresses quickly into a twisted gnarly leaf with browned edges. The indicas show more cal mag related deficiencies but both share the similar traits eventually.
At this point, I should mention I'm a fairly experienced grower having grown in most types of medium and most hydroponic systems. Under current/dwc is different and sensitive but I did massive amounts of research and asked tons of questions before trying it so give me the benefit of the doubt that I've tried almost all practical solutions to nutrient related issues and many suggestions others have presented, giving them all time to work if at all. We have a coco flood and drain system right next door that is doing beautifully and consistently doing 1.25-1.5 a light.
Here is the kicker before anyone makes up there mind. We recently had to bring in some of our coco moms into the room with the buckets because of unrelated issues. The coco moms stayed on their same nutrient regimen they've been on for years which is similar to the buckets. WE use sensi a and b, cal mag, rhizotonic,
liquid karma and sometimes
hygrozyme at 5.8 and 900 ppm, producing great bright green moms for years. After 3 days in the same room with the buckets, those plants started showing similar deficiences and issues. Indicas are showing rust spots and some drooping and sativas are showing extreme yellowing at all new growth shoots with a little contortion of the leaves. We put one back in the mom room and it went away.
WE now believe to have an environmental issue but the only things different in the bucket room from the coco room are CO2, the plastic tubs for the buckets and the black 4" drain pipe. I know of several people using the exact same drain pipes and tubs so I do't think thats it. Our last attempt at a diagnosis is a possible natural gas link in the CO2 burners connection. Additionally, the pilot light seems to go out a bit too often and the way this system works, I think that means a small amoutn of gas would be constantly emitted into the room and being that its a sealed room, the gas could easily build up for hours. Nat gas is toxic to plants but I'm at what levels. Anyone hear of something similar before? The closest I've seen is when I had some moms in the original hydrohut 3 years ago before I knew of the offgasing issue and my plants would turn yellow quickly before going almost white and the symptoms are very similar here.
If this proves to be another false diagnosis, we're in a bad spot. We have over 40k invested, 4 months wasted and all the electricity use. At this point I'm willing to offer a reward to anyone that can offer a diagnosis and solution. These are pics of the last round, I know everyone will think its nutrient but I really think something else is at least not allowing the plants to uptake nutrients properly, hoping the gas could be the problem.
Thanks in advance for the help and apologies for the long post but I know the more info the better.
