I'm growing (1) Robocrop Auto and (1) Blue Mammoth Auto in an indoor 4'x4'x7' grow tent using a hydroponic system and GH Flora Series nutes along with Calimagic, Hydroguard, and Liquid KoolBloom (during the flowering stage only). Temps and RH are controlled very well with a variety of equipment. I've changed out the reservoir faithfully every 7 - 10 days since the start.
After the first few weeks, I started to see yellow spots on new leaf growth of the Robocrop but not the Blue Mammoth and researched the internet to try and determine the cause. Based on factors including the appearance and location on the leaf of the spots, I ruled out leaf septoria (and a few other possibilities) and honed in on "calcium deficiency". My tap water is less than 50 ppm TDS and I had not been giving any calcium supplement up to that point. I started using Calimagic (at first 5 ml/gal with every feed) and the after several days the problem seemed to go away for some number of weeks. However, now towards the end of my grow (last few weeks before I will need to chop), the problem has returned again and this time on both plants. I have even been giving them Calimagic on a daily basis (4 ml/gal) with every water top-off, thinking it still might be a lack of proper calcium. Each of the affected leaves gets worse until it turns completely brown and dies. I would estimate that approximately 15% - 20% of the total of all leaves exhibit this issue. It does not seem to be affecting the plant growth or yield as I have some mighty fine looking flowers/buds on both plants and trichome color indicates another week or two before chop.
Although I think everything will turn out OK in the end on this grow, I'm worried about subsequent grows having the same issue (and maybe not the same benign result). What could I be doing wrong here to cause this?
I'm including 3 pics that best show the appearance of the issue. Thanks in advance for any helpful hints!
... StudioMan
After the first few weeks, I started to see yellow spots on new leaf growth of the Robocrop but not the Blue Mammoth and researched the internet to try and determine the cause. Based on factors including the appearance and location on the leaf of the spots, I ruled out leaf septoria (and a few other possibilities) and honed in on "calcium deficiency". My tap water is less than 50 ppm TDS and I had not been giving any calcium supplement up to that point. I started using Calimagic (at first 5 ml/gal with every feed) and the after several days the problem seemed to go away for some number of weeks. However, now towards the end of my grow (last few weeks before I will need to chop), the problem has returned again and this time on both plants. I have even been giving them Calimagic on a daily basis (4 ml/gal) with every water top-off, thinking it still might be a lack of proper calcium. Each of the affected leaves gets worse until it turns completely brown and dies. I would estimate that approximately 15% - 20% of the total of all leaves exhibit this issue. It does not seem to be affecting the plant growth or yield as I have some mighty fine looking flowers/buds on both plants and trichome color indicates another week or two before chop.
Although I think everything will turn out OK in the end on this grow, I'm worried about subsequent grows having the same issue (and maybe not the same benign result). What could I be doing wrong here to cause this?
I'm including 3 pics that best show the appearance of the issue. Thanks in advance for any helpful hints!
... StudioMan
