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Humic substances (humic and fulvic acids) are widespread, being present in soil, water, lake sediments, peat, and different coal. Therefore, there is a great interest for their immense role in terrestrial and aquatic systems, as well as their bio-stimulatory effects on plant growth. Humic substances, through their positive effects on plant nutrition and by increasing the tolerance to abiotic and biotic stress, lead to higher yields and superior quality crops. Their role in agriculture is essential, but humic subst...