there are some cheap multimineral supplement products for human consumption on the market. They contain only minerals which are required for plant growth. I wonder why dont we just use them , they are cheaper then commercial plant fertilizers and richer.
Here are ingredients of one of them.
Vitamin D (as Cholecalciferol) 400.00 IU 100%
Calcium (as Calcium Carbonate) 1000.00 mg 100%
Iron (as Hydrolyzed Protein Chelate) 18.00 mg 100%
Iodine (as Kelp) 150.00 mcg 100%
Magnesium (as Magnesium Oxide) 500.00 mg 125%
Zinc (as Hydrolyzed Protein Chelate) 22.50 mg 150%
Copper (as Hydrolyzed Protein Chelate) 3.00 mg 150%
Manganese (as Hydrolyzed Protein Chelate) 10.00 mg 500%
Chromium (as Hydrolyzed Protein Chelate) 100.00 mcg 83%
Chloride (as Potassium Chloride) 90.00 mg 3%
Potassium (as Potassium Chloride) 95.00 mg 3%
Only vitamin d here is useless rest are a nice boost to plant nutritien. Surely they will increase water GH however if we menage to use tiny amounts and if we have a good lighting , co2 system too we should get a nice crop