Sodium and Ion dispersion and Fulvic Acid and Humin decompositon
Hello!
For sodium and ion dispersion, am I correct in thinking that soils with higher levels of sodium ions (Sodic soils) have higher rates of dispersion because of the sodium going in between the clay particles, breaking the bonds between them, allowing the clay to disperse and with the addition of water swell?
For Fulvic Acid and Humin, and I correct in assuming because humin has a slower rate of decomposition, that the nutrients stored within it are less available to soil organisms and plants, as it takes longer to decompose and access the nutrients? Thank you!
Yes, all these assumptions are correct, with couple of clarifications:
Sodium does not break bonds between charged clay particles, but prevents bonds to form between clay particles by keeping particles far apart.
Decomposition of organic compounds, including fulvic acids and slow-decompression humin, releases not all 17 plant nutrients, but just those that are present in organic compounds (ie N, S, P and to much smaller extent K).