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Deinking paper sludge (DPS) soil amendments have potential as a climate change mitigation strategy. Understanding how DPS
application affects carbon mineralization in different soil textures is crucial but has not been well investigated. We performed
a 120 days incubation experiment to evaluate the effect of soil texture and DPS amount on CO2 emissions. Three different
textures were tested: silty clay, sandy-silt and sandy with three DPS doses: 0, 30 and 60 t.ha-1
. Results showed that DPS
mineralization without soil seemed very rapid with a high mineralized carbon amount (more than 2.500 gC.kg-1DPS), but did
not reach the stable phase. For amended soils, soil texture effects are marked at the end of incubation. The cumulative carbon
mineralization depended significantly on soil texture and DPS doses with a significant interaction. Among all soils with
different dose application, the highest cumulative carbon mineralization was revealed for silty-clay soil by applying 30 t.ha-1
as well as 60 t.ha-1 of DPS. However, the lowest values occurred for sandy soil. Only this latter achieved the stabilization phase
after 120 days and therefore stopped CO2 emission. The highest potential mineralization rate (C0) was achieved for silty-clay
soil by applying the two DPS doses. The mineralization rate (C0*k) was two times higher for this soil than the sandy soil. The
kinetic deviation of carbon mineralization applying the highest DPS doses (60 t.ha-1
) is similar for the four studied soils because
of C-decomposition blockage. These findings highlight the necessity to consider the combined effects of the DPS amount and
soil texture for assessing C release in DPS-amended soils.
Keywords: Deinking paper sludge, soil texture, mineralization, CO2 emission, doses.
Khouloud Abida, , Khaoula Boudabbous, Naima Kolsi Benzina. (2022) Assessment of CO2 emission of soils with different textures after deinking-paper sludge application, Pakistan Journal of Agricultural Sciences, Volume 59, Issue 3.
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