11. Humic acids generated by worms disintegrate rock; their burrowing behaviour speeds this up.12. When imazaquin is applied to crops its main interaction is with soil humic acids. 13. He adds dried kelp powder, naturally produced humic acid and a variety of powdered minerals. 14. Apart from radioactivity, the water quality is also weakened by humic substances and local sewage. 15. Clay minerals in the A horizon decompose by reaction with humic acids and form soluble salts. 16. Fulvic acid is of relatively low molecular mass and is biologically more active than humic acid. 17. Leonardite is an oxidized form of lignite, which is also contains high levels of humic acid. 18. The presence of carboxylate and phenolate groups gives the humic acids the ability to form chelate complexes. 19. The mixture is heated to inactivate the enzymes and then filtered to remove the insoluble humic acid. 20. In Labrador along the Churchill River valley Ferro-Humic Podzols comprise about 36 % of soils.
