Originally Posted by ChasingGreen
I got a couple questions I'm hoping you guys can help with:
1) My plants are currently showing light green at all the new growth. The lower older leaves are very nice and lush dark green, so that makes me think this is not a nitrogen deficiency since it's mobile and would start at the bottom, not the top. What normally causes this? I have not changed soil (Edit: Actually, there's a chance I might have used too much Dolomite Lime this round), nutes, etc. I did go from tapwater to RO water and I have not been adding any calmag when I do the plain waterings. I did go to a 1k light from a 600 and added AC and co2. Co2 is being kept at 1,000ppm.
2) Is it detrimental to the plants to be less than 18" under the hood of an air cooled 1k light with ambient canopy temperature of 67F? I'm not sure if you have to keep the plants away from the lights due to heat, or due to light bleaching or something? Please let me know. The leaves are a little canoed up, but not much at all. They are all praying happily as well pointing upwards.
1. From my experience, N is not as mobile as you would think, and from what I've personally seen, N def starts at the top, not the bottom... granted I haven't seen a N deficiency in years, rather too much, but I digress...
I have ALWAYS shied away from RO water... IMHO it's too much hassle to strip the water clean only to add stuff BACK to the water lol.. but that's just me.
First thing I would do though is check that ph, if your ph is sky high because of the Lime, you may risk knocking absorption of other nutes outta whack as well.
2. From personal experience, absolutely not. Only time my plants are ever further than 18" away from an HID is if I've lifted it up to harvest or some kinda maintenance or something lol
. No seriously, I can't remember the last time I had my 1k's more than 18" away...it was usually 12-18 unless I was doing vert, then my 600's were like 8-12" away from colas.
67*F is rather cool to grow isn't it? I've always kept my rooms between 72-78*F... only lowered to 65-70"F the last week or so to induce purpling in certain strains...
Hope this helps... take my info with a grain of salt...