Frontiers | Biostimulant Potential of Humic Acids ...
Plants were cultivated in a climate chamber under 14 h light/10 h dark cycle, with an air temperature of 27/21°C, relative humidity of 70/85% and at a photon flux density of 280 mol m -2 s -1. On the 12th day, part of the plants was treated for 48 h with humic acids (HA) extracted from Amd-C and OMWF amendments.