Soil compaction dependence on sub-field spatial soil constraint variability

O'Connor, Danny (2022) Soil compaction dependence on sub-field spatial soil constraint variability. [USQ Project]

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Soil constraints are known to vary spatially at the sub-field level, both across area and with depth. The impact of these, varying with time, are largely driven by moisture content status. Soil compaction is a soil constraint that is difficult to determine due to the requirement of a natural benchmark condition (soil density prior to any traffic or operation) or proximal benchmark condition (spatially natural soil proxy), both of which are almost impossible to obtain for most models. For this reason, the focus on soil compaction has been on vulnerability and susceptibility of soils throughout the landscape. However, as on-farm management moves towards a finer scale of land management unit (LMU), approaching machine frontage resolution (e.g., 12x12m LMU based upon a 12 m operational frontage system), industry discussion has shifted to the sub-field variability of soil compaction vulnerability and susceptibility, an influential factor which remains unknown. It was suspected that the magnitude of stress imparted on the soil by modern harvesting machines would be far greater than the sub-field variability of vulnerability and susceptibility, meaning that alleviation of compaction incidence should be the first step for best management practice. This study was conducted to provide laboratory-based evidence for stress state impact based upon sub-field soil type and constraint diagnosis, at four fields, for a range of moisture contents. Outcomes from the investigation suggest no direct relationships can be drawn between soil pedological factors and constraints. This comes with the observation of significant variance in compaction parameters at the subfield scale, at a rage of sites. In spite of this, the degree of compactness as measured from the samples indicate crop growth will be restricted under these conditions. Inferring the key message being the overriding effect of stress on compaction and hydraulic reduction despite sub-field variability.

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Current – Faculty of Health, Engineering and Sciences - School of Engineering (1 Jan 2022 -)
Supervisors: Chen, Guangnan
Qualification: Bachelor of Engineering (Honours) (Agriculture)
Date Deposited: 19 Jun 2023 04:38
Last Modified: 20 Jun 2023 01:11
Uncontrolled Keywords: soil constraints; soil compaction

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