Humeome dynamics of paddy soil after short term rice cultivation

Humeomics is a sequential chemical fractionation that uses in the order organic solvent extraction, transesterification with boron trifluoride in methanol, methanolic alkaline hydrolysis, cleavage of ether and glycosidic bonds with HI, and final alkaline extraction, The Humeomic procedure was applied for the first time directly on paddy soil after two cultivation seasons (2014 & 2015) and revealed a series of unique soil organic matter (SOM) fractions with specific molecular composition. Organic Carbon (OC) analysis revealed a significantly larger amount of humic component was solubilised in humeomic fractions (3.7 times more OC in 2014 and 2.5 times more in 2015) than it was extracted by the traditional alkaline extraction method, increasing the knowledge on SOM. The organosoluble to hydrosoluble organic carbon ratio of the fractions revealed increased hydrophobic protection of rice paddy soils even under short term cultivation period.