A 1988 study conducted at North Carolina State with tomato seedlings that were greenhouse-grown in a solution of limited nutrient availability show significant increases in P, K, Ca, Mg, Fe, Mn, Cu and ZN when humic acid is added.
Response of tomato plants grown in limited nutrient solutions to applied humic acids
P. P. David, P.V. Nelson and D.C. Sanders, Department of Horticultural Science, North Carolina State University, Raleigh, N.C.
Reports from Sofbey Sarl/Lances Link
Outside the US, Enersol is sold as Blackjak which is a registered trademark of the Swiss company
Sofbey Sarl/Lances Link SA in 28 countries including Europe, Asia, South America, Africa and the
Middle East (cf. in particular IR No. 702266A “Blackjak”).
BLACKJAK is a registered trademark of MTI Bio-Ag in Australia
BLACKJAK is commercially available from MTI Bio-Ag in Australia and Saudi Arabia