Hi All,
I'm a newer grower. I started growing hydro a few months ago ( RDWC ) and have been using Mega Crop from the start. Plant growth has been very vigorous, but I've been experiencing some deficiencies that I can't quite figure out. They appear to be calcium deficiencies to me. But I have been unable to stop the issues. So I'm second guessing myself.
Currently I'm using 5g/gal MC, and 3ml/gal Calmag ( 2-0-0; I've been increasing this slowly ). Nothing else. This comes out to around 700ppm. I change out ~50 gal of water each week using the nutes above. I am using RO water. My top off water is also RO w/ ~2.5ml calmag only ( using a float switch ).
The tops look fine to me. Mid to lower fan leaves exhibit brown spotting. The lowest fan leaves are hit the hardest and look pretty rough.
Thanks in advance for any help!
System: ~100 gallon RWDC. 6" net pots w/ hydroton. Lots of air blowing in each 5 gallon bucket.
Lights: Mars Hydro TS-1000 ( veg ), 630w CMH ( flower ).
Temp: 75
RH: 50
TDS: 600-750
PH: 5.5-6.5
Water: RO
600-750 seems awful low for 5g/gallon, with calmag included?