Tillage and Compactive Modifications of Gaseous Flow and Soil Aeration

摘要: Oxygen influx and carbon dioxide efflux from the rhizosphere are adversely influenced when tillage traffic reduce soil porosity. Greater anaerobiosis inhibits plant growth/development modifies aerobic microbial populations activities. Although greater volumetric water contents of compacted soils may improve seed germination perhaps emergence, root systems young seedlings generally encounter adverse gaseous concentrations below zone. Temporarily saturated zones at interface deeper areas (e.g., pans, wheel tracks, etc.) often result in lower oxygen contents, causing reductions metabolic energy levels roots growing those regions. Concurrently, dioxide, ethylene, other biogases accumulate sufficiently to cause additional physiological morphological changes development; disease susceptibility is also increased.