Humic acids promotion os seedling root developement

From the report “Humic Acid Seed and Substrate Treatments Promote Seedling Root Development“, of Jack A. Hartwigsen and Michael R. Evans, published at Hortscience Seed of Pelargonium ×hortorum L.H. Bailey ‘Freckles’ (geranium) and Tagetes patula L. ‘Bonanza’ (marigold) were soaked for 12, 24, or 48 h in solutions containing: + 0 (deionized water), + 5000,…