Noticed my plants leaves turning light green and then yellow....some pics I've seen on the internet indicates possible zinc def.....others tell me it may be a magnesium def.... any thoughts on what it may be? using black gold, 200w pro flourescent, 18/6 & watering at 6.5
if your ph'ing your water at 6.5 and have been since the start, thats way to low and your soil looks like it could use some perlite for air in the the soil. Ive read about "ph" on here and have had ph problems myself. . Ive heard 6.5, 6.8, 7 (which 7 in neutral) and it says 7 in the "Grow Bible" I even had the guy at the Hydro store tell me it should be 5.9 and "yes" he did know i was in soil NOT hydro, and he insisted it should be in the high 5's low 6's If your soil is ph balanced when you buy it, (I use FFOF) and you add water ph'ed at 7, or 6.9 it balances the soil to 6.5 or so which the plant likes. If you ph your water and or water nute mix at 6.5 ever time your going to over time bring that ph level 0.5 Down. Phing at 7, IS NOT TO HIGH nomatter what anyone tells you. You can always bring it down slowly, bringing it up I think is harder and more stressfull on the plant. My last grow i started phing my water at 6.5 to 6.6 and had problems from the start, looking back at my notes the ploblems started 9 days into vegging and continued throwout until i fixed the ph problem (bring it back up to 6.9, 7.0) harvest was still good and plentyfull but i hadthose same problem as your leaves (My pic looked exactly the same) It may NOW be a cal/mag def. BUT thats because of the ph being OFF BALANCED. FLUSH, FLUSH thats the first thing you should do, then try phing your water/nutes mix at 6.9. it cant' hurt!! remember that 7 is neutral and thats what the "Grow Bible" says. Also check your "run-off. Im on a new grow now, im in quart cups phing my water at 6.9 to 7.0 (out of the tap siding for 24 hours) and MY run-off is 6.2 to 6.3. Now if i was phing it like you have, at 6.5, id be in the low 5's which is NOT good for a soil grow. Well thats my two sence. If anyone can add to what i said PLEASE DO.
