I have a nutrient deficiency with one of my plants. Details:
Soil: Fox Farm Ocean Forrest
PH: 6.5 – 6.7
Light: Apollo Horticulture LED Grow light 400w X 2
Pot size 4.5 gal
Temp: 78-82 degrees
A week ago I re-potted this plant because it was getting big and I started to notice some browning on the leaves (see picture). I ‘THINK’ this is a calcium deficiency, but I cannot be sure as the symptoms are easily confused with other problems. I have 3 other plants which were germinated and planted at the same time in the same type of soil (FF) and none show the characteristics seen in this one plant.
All 4 plants are growing fast – my concern with taking any kind of action is; I am not 100% sure what action to take and I do not want to flood it with nutrients or other stuff before I ask some people who have greater experience with a diagnosis.
For a calcium deficiency I have Dyna-Grow Foliage Pro. My plan to address this problem is to flush the soil with approximately 10 gal of water, measure the run off PH then add a tablespoon of Dyna-Grow to 1 gal of water and water it. I’ll use that for several days and see where I stand after a week or more. I realize the leaves with brown spots will not turn green and I’ll have to watch newer growth for repeat symptoms. I can also easily get some garden lime or dolomite lime - just not sure which one to use.
Any further suggestions?