Non-humic substances formed during organic matter decomposition probably play a more important role than do humic compounds in the mineralization of N and S as well as in the solubilization of iron and other micronutrients.

Question

Quizplus · Accepted Answer

Non-humic substances, which include various organic acids, low molecular weight compounds and microbial metabolites, have been shown to have a greater impact on nutrient availability and soil properties than humic compounds. For example, organic acids can chelate micronutrients and increase their solubility, while microbial metabolites can stimulate mineralization of N and S. Therefore, non-humic substances are more important for nutrient cycling in soils than humic compounds.

Non-Humic Substances Formed During Organic Matter Decomposition Probably Play a More