Table 4.4 continued - effect of agricultural management practices on SOC and consequent agronomic effects. Agronomic consequences Agronomic consequences Soil carbon consequences Soil carbon consequences No Practice d What we know What we don’t know What we know What we don’t know Preventing erosion control most likely No data erosion associated with No data soil erosion to be driven by associated large SOC losses productivity benefits erosion associated with large productivity losses Stubble reduced soil erosion No data should increase SOC No data retention water conservation soil C consequences Increased potentially increased No data should increase SOC No data production profitability potential GHG emissions (fertiliser, from increased fertiliser disease and pest management) Addition of can reduce nutrient No data should increase SOC No data offsite organic requirements matter can increase plant (compost, productivity manure) No data No data Reduce loss of income in year increase plant inputs fallows (green green manure grown compared to bare fallow manure/cover water conservation crop) weed control can reduce nutrient requirements Sources: soil carbon workshop 2012; Sanderman et al. (2010); CSIRO Land and Water; Paterson and Hoyle (2011).
Table 4.4 continued - effect of agricultural management practices on SOC and consequent agronomic effects. No Practice d Agronomic consequences What we know Agronomic consequences What we don’t know Soil carbon consequences What we know Soil carbon consequences What we don’t know Preventing soil erosion erosion control most likely to be driven by associated productivity benefits erosion associated with large productivity losses No data erosion associated with large SOC losses No data Stubble retention reduced soil erosion water conservation soil C consequences No data should increase SOC No data Increased production (fertiliser, disease and pest management) potentially increased profitability No data should increase SOC potential GHG emissions from increased fertiliser No data Addition of offsite organic matter (compost, manure) can reduce nutrient requirements can increase plant productivity No data should increase SOC No data Reduce fallows (green manure/cover crop) loss of income in year green manure grown water conservation weed control can reduce nutrient requirements No data increase plant inputs compared to bare fallow No data Sources: soil carbon workshop 2012; Sanderman et al. (2010); CSIRO Land and Water; Paterson and Hoyle (2011).
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