Hello All,

First, thanks to everyone on this site....the info provided has helped me on more than one occasion!

The situation:
Hydro: DWC, 5 gallon bucket, 2 5 inch airstones, hydroton
Cabinet: 2x2x5 Flowering Area
Light: 150w HPS, 6-8 inches from tops (hand comfortable)
Nutrients: GH 3-part, using Lucas Formula 0-8-16 (PPM:1200, pH 5.0-5.5)
Temps: 72-80 (+0-8 deg over ambient)
Water: Aged tap, PPM < 70
Air: Venting through DIY carbon scrubber with 175 CFM fan, 1 circulating fan underneath canopy (won't fit above...), passive intake.
Method: ScrOG; daily top-off with pH adjusted H2O, drain weekly, flush bi-weekly with Clearex.
Genetics: Unknown (guesses are appreciated!) Rhino?
Age: Beginning 6th week of flower; clones from bonsai mother 1.5 years old
I think that's all the basic information....:thumbsup:

Basically, this is my second attempt at this strain. I started with full-strength nutes from GH and practically burned them up around the same week. Limped through to a sub-standard harvest of 70g. I learned (or so I had thought), then switched to Lucas Formula hoping to find a magic bullet. Plants did great through 0-5-10 (veg 4 weeks), but starting showing signs of significant burn (I think) by the beginning of last week. I Clearex flushed, trimmed the crispy tips of affected leaves, and continue having problems. I have sinced backed down to 75% of Lucas (PPM 910 [.7] now), but seem to be continuing to have the same issue. I am currently considering dropping to 50% of Lucas which would put PPM around 650-700 or so....or maybe switching back to 0-5-10 as suggested for "low-intensity lights" even though I am using a small HID. I'm worried about "starving" them when I want them putting on weight.

Based on the attachments:
1. Is this nutrient burn, or some sort of definiency?
2. Do I need to back way off the nutrients using such a small light (I've seen suggestions for low-intensity lights....)?
3. Do I need to adjust nutrient levels since this is a DWC (vs. NFT, ebb-flow, etc.)?
3. I know this may be a genetics problem (this hermies pretty easy too), but I don't want to waste a bunch of money on genetics if I'm setting them up for failure too.

Thanks for any help!!!
sneekymofo Reviewed by sneekymofo on . Nute Burn with the Lucas Method? Hello All, First, thanks to everyone on this site....the info provided has helped me on more than one occasion! The situation: Hydro: DWC, 5 gallon bucket, 2 5 inch airstones, hydroton Cabinet: 2x2x5 Flowering Area Light: 150w HPS, 6-8 inches from tops (hand comfortable) Nutrients: GH 3-part, using Lucas Formula 0-8-16 (PPM:1200, pH 5.0-5.5) Temps: 72-80 (+0-8 deg over ambient) Rating: 5