Abstract
The decomposition of organic wastes contributes to greenhouse gas (GHG) emissions and global warming. This study evaluated the effect of biochar (BC) produced from different farm wastes (chicken, pig and cow manures) on greenhouse gas emissions and soil chemical and biological properties in different grassland soils (volcanic and non-volcanic soils). A 288-day laboratory experiment was carried out, monitoring CO2, N2O and CH4 emissions and evaluating total C, soil pH, microbial biomass and enzymatic activity in three grassland soils. The results varied depending on the soil type and feedstock of BC produced. BC-cow decreased emissions of CO2 and CH4 fluxes for volcanic and non-volcanic soils, probably due to decreases in β-glucosidase activity. Biochars from cow and pig manures increased soil C content, favouring the persistence of C into the soil at 288-days of incubation. Soil pH increased with the application of BC in the soils.
Highlights
Soil organic carbon (C) is a key factor that influences both crop productivity and soil functions
C-sequestration refers to an increase in soil organic C content caused by a change in land use or management, which can help to mitigate greenhouse gas (GHG) emissions
These farm wastes tend to have an important fraction of labile C, which rapidly mineralizes in the first time of decomposition
Summary
Soil organic carbon (C) is a key factor that influences both crop productivity and soil functions. An alternative fate of the residue needs to be accounted as net transfer of C from the atmosphere to the soil; the repeated application of exogenous organic matter has been shown to increase soil organic C over time but the increase tends to level off as soil organic C content increases [2]. These farm wastes tend to have an important fraction of labile C, which rapidly mineralizes in the first time of decomposition (registered as CO2 emissions). Rapidly mineralizable organic materials with less content of C could be a better alternative to increase net C-sequestration and reduce GHG emissions
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