• composted soil conditioner;
  • direct seeding;
  • mulch;
  • revegetation;
  • seasonal wetland


Three thicknesses of composted soil conditioner, and one combined with mulch, surface-applied and then incorporated into the sandy topsoil, were tested against controls for promotion of native plant establishment by direct seeding in construction of a seasonal wetland complex. Located 50 km south of Perth, Western Australia in a Mediterranean climate, the site typically dries out in summer. In wetter seasons ponds intercept contaminants in freeway runoff and act as a buffer for peak flows. The 20 mm thickness of soil conditioner was the most effective. The 40 mm thick 40:60 blend of soil conditioner and mulch was also effective – the mulch can help reduce soil erosion. Composted soil conditioner, typically produced by recycling accumulated municipal waste, counteracts soil organic matter and nutrient depletion.