When the
humic acid concentration increased, the ALP activity began to increase then decreased again (P < 0.05).
In the first part, the
humic and fulvic acid fractions were extracted, purified, lyophilized, and submitted to the spectroscopic and elemental analyzes.
Humic substances--made up of carbon and other elements--are the lifeblood for fertile soils.
(ii) To evaluate
humic substance chemical composition using solid state [sup.13]C-NMR
Patsaeva et al., "The "blue shift" of emission maximum and the fluorescence quantum yield as quantitative spectral characteristics of dissolved
humic substances," EARSeL eProceedings, vol.
Brunetti, "Characterization, differentiation, and classification of
humic substances by fluorescence spectroscopy," Soil Science, vol.
TABLE 1: Organic carbon (C) content on 0-40 cm soil layer in the fulvic acids (AF),
humic acids (AH) and humin (HUM) of
humic substances and sum of these three fractions (SOMA) on four situations of soil use in a
Humic Dystrupept in southern Brazilian highlands.
"We undertook further mass spectrometry experiments, which suggest that there can indeed be a match between the types of structures we found in the databases and the molecular components of
humic systems," Zherebker added.
Quinones are also responsible for the formation of reactive oxygen species (ROS) in
humic acids, which are useful for wound healing and have bactericidal properties (Melo et al., 2016).
Conversely, what management activities increase
humic acid and organic matter in our soils?