Information
Level 4 Data summaries and links to related documents and reports
- Holland et al (2007) found that the raised beds had greater pore connectivity and were able to transmit solute faster and more efficiently than the conventionally cultivated soil. Raised bed soils are better structured and provide less risk from water-logging than conventionally cultivated soils. However, there is greater potential for preferential flow of pesticides and solutes in raised bed soils.
- Holland et al (2008) found that the soil under raised beds was significantly better drained than conventionally cultivated soil, and therefore was consistently drier and had improved soil aeration. There was no significant grain yield benefit from raised beds during 2 years of below-average rainfall.
- Holland et al (2012) found that raised beds significantly increased the amount of runoff relative to the other treatments when above-average rainfall was received, but there was little difference in runoff in years of below-average rainfall. No consistent effect of runoff on crop biomass was detected nor could any differences in runoff be attributed to differences in soil water content, hydraulic conductivity, and bulk density between treatments. The furrows between the raised beds acted as conduits for the flow of surface water during the larger storm events.
- Wightman et al (2004) found that the intensity, duration and timing of rainfall during the season are significant contributors to measured differences in run-off volumes between raised bed and flat-cropped treatments. When rainfall intensity exceeds soil infiltration capacity, raised beds tend to release greater volumes of run-off than conventional flat-cropping and pasture treatments
Key tables and figures extracted from data, literature and miscellaneous publications
Holland Papers Various Clippings
Wightman Paper Various Clippings