Humic acids help. Fulmic acids particularly. Basically just soak some peat moss in water and add the brown water after running it through a coffee filter. Adjust pH upward if needed to a pH around 5.6 I never clone at any lower pH than 5.5 to 5.6
Fulvic acid readily complexes with minerals and metals making them available to plant and
easily absorbable through cell walls. (1)
Fulvic acid can often transport many times its weight in dissolved minerals and elements. (2)
Fulvic acid has close association with enzymes.(3) It increases activity of enzymes, and especially influences respiratory catalysts. Fulvic acids increase the activity of several enzymes including alkaline phosphates, transaminase, and invertase.
Fulvic acid metal organic complexes are of a low molecular weight, (4) and because of this they are also of low molecular size, and are capable of a high degree of penetration into cells. Fulvic acid complexes and chelates are able to readily pass through semi-permeable membranes such as cell walls. Yet it is important to note that it has also been determined that fulvic acids not only have the ability to transport nutrients through cell membranes, they also have the ability to sensitize cell membranes and various physiological functions as well. (5)
Fulvic acid appears to cause the genetic mechanism of plants to function at a higher level. It has been concluded that any means by which plant cells are exposed to fulvic acid can improve growth.( 6)
References
1. Williams, S. T. (1963). Are antibiotics produced in soil? Pedobiologia, 23, 427-435.
2. Many times its weight- Deb, B. C. (1949). The movement and precipitation of iron oxides in podzol soils. Journal of Soil Science, 1, 112-122.
3. Fulvic and enzymes – Pardue, H.L, Townshend, A., Clere, J.T., VanderLinden (Eds.), (1990, May 1). Analytica chimica Acta, Special Issue, Humic and Fulvic compounds, 232 (1), 1-235.
(Amsterdam, Netherlands: Elsevier Science Publishers)
4. low molecular weight, Aiken, G.R., McKnight, D.M., & VacCarthy, P.1985). Humic substances of soil, sediment and water, New York: Wiley-Interscience.
5. Sensitize cell membranes- Rashid, M.A. (1985). Geochemistry of Marine Humic Substances. New York: Spriner-Verlag.
6. Genetic and growth-Jackson, William R. (1993). Humic, Fulvic and Microbial Balance: Organic Soil Conditioning, 538. Evergreen, Colorado: Jackson Research Center