Healthy soil and sustainable growing

["TradingPostPaul" <tradingpost@riseup.net>]

Soil Humic Substances 
http://www.ar.wroc.pl/~weber/humic.htm

   1. Definition of humic substances
   2. Function of humus in the soil
   3. Formation of humic substances
   4. Properties of humic substances
   5. Properties of non-humic substances
   6. Humic substances complexes with mineral components
   7. Determination of content of humic substances
   8. Extraction of humic substances
   9. Organic forms of soil nitrogen
  10. Organic forms of soil phosphorus
  11. Types of humus in soils
  12. Humus content in soil
  13. References
  14. IHSS8 Proceedings
  15. 15 International Symposium on Environmental Biogeochemistry (ISEB 15)
  16. The first International Journal on Humic Substances
  17. Humic substances conferences
  18. 10 Meeting of the International Humic Substances Society (IHSS10)