OG Kush / Sour Diesel DWC Grow - Leaf discolouration / brown spotting

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BigPooteene

Active Member
Hi all,

1st time poster / long time reader. Plants (2) sprouted from seed just over 2 weeks ago (Oct 25). This is my first DWC grow and I've noticed some discolouration / brown spots appear on a few leaves in the past 2-3 days (may be hard to see on the pics..). I'm also noticing some upward curling of some of the leaves. One of the plants seems to be more affected than the other, but they both seem to be on the light side of green.

Setup:
36"x36" Grow Tent
400W HPS @ 18" from tops, 18/6
Temp: Lights on: 25-26 deg. C, Lights off: 21 deg. C
RH around 50% with lights on, 60-65% lights off
Plenty of ventilation, leaves are constantly rustling
5 gal DWC buckets with air pump / air stones
Seedlings started in rockwool, transplanted to DWC Nov. 1

Nutrients:
GH Flora Trio + Rapidstart and Floralicious Plus (Currently following GH recirculating feeding schedule @ +/- 75% of recommended concentration (changed water 2 days ago) since plants were on the lighter side of green.. 1st week in DWC was at 1/4 strength, didn't use any nutes at first until the 2nd set of fan leaves started to form).. Current reading is at 600 PPM, tap water comes out at 40-50 PPM (R.O. is not an option for me).. PH is hovering around 6.0.

Any ideas on what could be causing this? I was thinking that since my tap water is coming out with such low PPM that it may be a calcium or magnesium deficiency or maybe both? Over-feeding or under-feeding nutrients? I've been reading "The Complete Guide to Sick Plants" ( https://www.icmag.com/ic/showthread.php?t=11688 ) and so far I'm thinking it's a calcium / magnesium deficiency, but I would appreciate any insight and advice from people who know what they're talking about to put me back on the right track!
 

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Outcastinc

Outcastinc

Active Member
I'm running 400 ppm rightnow at two weeks.... 600 seems kinda hot to me. You shouldn't get to 600 until like week 4 or 5 of veg never more than maybe 750 depending on the strain. Here's a gh feeding schedule I found that works well for me
 

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Homegrown Hero

Homegrown Hero

Well-Known Member
I’ve grown variations of these strains before, I recall the sour kush by Reserva privada was always light green from seedling to harvest. Other than the light coloration, they look healthy imo
 
70's natureboy

70's natureboy

Well-Known Member
I think they are still growing and adapting fine. they would probably be happier under some flourescent lights for a couple weeks but they will still grow ok under hps.
 
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BigPooteene

Active Member
They did end up doing fine, well one did anyways - I had to get rid of one cause they went through a crazy stretch when I switched to 12/12 and I ran out of room (may have had something to do with high temp fluctuation btwn lights on and lights out periods). Ended up quite good though for my first DWC grow, even though all my leaves had brown tips likely due to overfertilizing, after roughly 9 weeks of flower time I ended up with 250g dry off one plant!
 

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BigPooteene

Active Member
Outcastinc said:
Beautiful bro. Congratulations. They looked a little heat stressed at on point and yeah you definitely only had room for one in there lol. Here I am at week 2....my ppms keep raiding from 400 to 480 ever two day right now. Idk....
Click to expand...
Yeah they were definitely too close to the light at the end! Or I didn’t have enough venting power.. anyways, live and learn :) yours are looking good for 2 weeks in i think about the same as my previous grow.. here’s my follow up grow at 1 week.. 2 autos this time, hoping they will stay small and both make it to harvest!
 

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BigPooteene

Active Member
Yeah they’re great for LST, they’re “Command” 0.5lb damage free mini hooks from 3M that I picked up at my local hardware store
 
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