Peter Andrews took over management of Tarwyn Park when it was severely degraded and salinised. He spent many years researching and applying innovative ways to restore landscape function, based on building soil condition and managing water movement through the landscape. Today the property is a leading example of regenerative landscape management.
Peter and his son Stuart, who now manages Tarwyn Park, hosted a field day on 14 April to explain the methods used and show the results achieved. Read on for some of what we learned and for images from the day…
Plants colonise land according to the land’s potential to host those species. The first colonisers, that we often call ‘weeds’, establish in degraded and disturbed soils. Their function is to build up nutrients and soil structure and enable other plants to follow. As nutrients develop in soil, so more valuable plants inhabit the landscape.
Accordingly, there is nothing to be gained from removing ‘weeds’ early, because the greater the biomass to harbour increased nutrients and produce organic carbon, the faster the progression to more desirable species. We need to sponsor and replicate natural processes of plant succession as a function of landscape regeneration.
When asked about the controversial use of willows in his landscape, Peter explained, “Yes. I have planted 3000 willows. Look along the creek and see how many have survived among the casuarinas. Of course, the casuarinas would not have survived in that creek line without the willows. So what did the willows do that was wrong?”
Participants raised their perceived concerns with willows, however, the strongest objection seemed to be that they are an introduced species. Peter responded, “Willows are early colonisers that stabilised the creek system to allow the casuarinas to develop. Sure, they are an introduced species … and so are we. And the hard footed animals that have so damaged our native environment over the past two centuries … they are introduced species also.”
Clearly, willows can be used as just another management tool to help regenerate the landscape.
It was also noted by NRM specialist in attendance, Peter Hazell, “The willows that have survived in the creek are weeping willows which are not listed as weeds of national significance.”
Similarly with the management of soil hydrology, we need to replicate natural processes. We need to develop flow patterns that slow water and have it moving through the soil to distribute soil nutrients and support vegetation – rather than flowing across the top. Vegetation growth in turn protects the soil, moderates temperature and reduces evaporation.
Field Day participants were treated to a demonstration of the different way water interacts with the soil when its flow is slowed. By placing some straw mulch to divert the flow across the gradient of a farm track, the benefits of diversion and filtration were illustrated: the water spread more widely and was absorbed, rather than running off – even on the well-compacted track. We can mimic these practices in our landscapes to restore healthy hydrological function.
By revegetating higher ground and using these areas for stock shade, this also allows for the transfer of nutrients and carbon up and across the landscape. In managing this however, we need to be careful that stock camps do not develop as sources of potential gully erosion. Active management, observation and response are critical components of regenerative agriculture.
The innovative solutions on display at Tarwyn Park are tools to increase productivity and to overcome many of today’s farming issues including:
- declining fertility (and low soil carbon)
- dryland salinity
- stream, gully and wind erosion
- watershed dislocation
- lack of biodiversity
- lack of farm water availability especially in times of drought
The health of the Tarwyn Park landscape and its soils are the best evidence that Peter Andrews’ soil hydrology management practices can work. If you work with landscape processes, you will reap the results.
As summed up by Peter and Stuart:
Slow the flow
Let everything grow
Careful where the animals go
– and filter is a must to know
Find out about future Tarwyn Park activities via the Tarwyn ParkTraining Facebook page.