Dear ResearchGate Community,
I am conducting an analysis to compare the carbon sequestration potential of applying 1 ton of fresh organic residues directly to soil versus the application of 1 ton of the same residues after composting (meaning we would apply a lower amount: maybe 0.3-0.6 t of compost).
My objective is to quantitatively assess the differences in carbon sequestration efficiency, accounting for carbon loss through mineralization during decomposition or composting, and the long-term stability of carbon in the soil.
How do these two approaches—using an identical starting quantity of organic material—affect the net carbon balance in agricultural soils? What are the expected differences in carbon stabilization, mineralization rates, and overall carbon sequestration efficiency between fresh and composted inputs?
Additionally, how might factors such as the type of organic residues, soil properties, and environmental conditions influence the outcomes?
I welcome any insights, empirical data, or research findings that could illuminate the comparative effectiveness of these soil amendment practices.
Best regards,
The different carbon fractions of the soil amended with fresh residues showed significantly higher mineralized rates than with same quantity of compost because the higher amounts of humic substances and fulvic and humic acids that serves to support plant life.
Prem Baboo I'm not interested in the same amount applied, but the same initial amount: 1 t fresh versus 1 t composted (for example resulting in 0.5 t of compost). The comparison is 1 t fresh residues versus 0.5 t of the same amount of residues but composted.
Composting will release perhaps 30% of the C as CO2 -- depending in part on the C:N value -- but much depends on how tough the C source is and what antimicrobials are present
La séquestration totale de carbone dans l'arbre est obtenue en multipliant (ba + br) par tc (taux de carbone = 0.475 tC/tMS (Giec, 2006. Cette augmentation du taux de carbone dans les sols ne les rend pas seulement plus fertiles mais aussi plus stables afin de limiter leur érosion .La séquestration du carbone dans les sols est possible à travers une restauration des pratiques d'utilisation des terres : agriculture de conservation, agroforesterie, utilisation de plantes de couverture ou de mulch, utilisation de composts et de fumiers
Thomas
I guessing you are comparing between the to products in or added soil. we did work on a rangeland field applications of biosolids, one treated with anaerobic digestion the second was composted. We had application rates in dry mt/ha 0,1,2.5,5,10,15. We had trouble quantifying differences between the products in soils until we approached 5 dmt/ha or more. Just a thought.
Bob
Fresh residues will bring to more active mineralization even existing soil organic matter. We have been watching this effect during 3 years. In science literature we found what it connects to - there are more cyanobacteria in FR which release O2, oxidizing SOM
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