Rehydration focuses on soil as a sponge

LDC hosted a field day attended by more than 25 people, at Worona Station to showcase the work the LeFeuvre family has carried out to rehydrate their property.

Graziers were able to see first-hand how a producer has increased his water infiltration, reduced erosion and maximised pasture function. This was achieved by constructing a series of diversion banks, porous check dams and managing track drainage.

Land management techniques including a grazing management plan have also been introduced to combat erosion and to improve landscape function, ground cover and, ultimately, the productivity of the 6,677-hectare operation.

The aim of the field day was to show graziers examples of how moisture can be retained on their property, and to provide them with tools to help them work out the most cost-effective way of implementing a solution to problems like erosion in the landscape.

NQ Dry Tropics worked with the LeFeuvre family on the rehydration project which was funded through the Australian Government Reef Trust program under the Point Source Sediment project.

This ABC story on Worona is worth a read: Landscape rehydration on Worona.

Read more about the transformation at Worona Station here.

CEO of The Mulloon Institute Carolyn Hall made reference to the rehydration work carried out in partnership with NQ Dry Tropics during a recent information evening at the NSW Parliament which can be seen here

We put the diversion bank in about three years ago, but it only diverted the water. It has been the grazing management and cattle that has built the soil and grown the grass that’s here now.
 
It was barren before and eroding quickly. We used electric tape and put in a dense mob of cattle in the wet. It looked like a cattle yard, but the response tells the story.
 
More soil, more grass, better infiltration and sediment being deposited where we need it in our country.”
 
— Worona Station grazier Chris LeFeuvre

Philosophy to keep, and use, ALL the rain received

The Mulloon Institute’s Sam Skeat

​LANDSCAPE Planner with The Mulloon Institute, Sam Skeat, was guest presenter.

His role was to provide advice in the context of landscape rehydration with a focus on balancing ecological return and business return when undertaking landscape rehydration projects.

Three principle topics were covered:

  • key principles of landscape rehydration;
  • practical on-ground interventions for graziers to take away to adapt and apply to their own landscape; and
  • understanding how grazing management supports pastures and soils that hold moisture efficiently.

Here’s a snapshot of what Sam had to say.

“Graziers are wanting to know more about how to enhance surface and groundwater management for production and ecological goals,” he said.

“Part of that is learning how to read the landscape and to tap into the landscape’s natural system of self-rehydration. Hydration is the lifeblood for plants and animals.

“The key principles of landscape rehydration includes slowing rainfall runoff, increasing water infiltration into soil, increasing groundcover, plant density and regrowth, and restoring natural water movement patterns.

“I help graziers to identify the best on-ground strategy and works to remediate priority areas that need to be restored.

“This involves providing practical and hands-on information so graziers can go away with a clear sense of suitable action they can take to slow water movement and increase stable hydration on their property.

“This can be done through myriad methods including diversion banks, leaky weirs and spreader structures.

“It is then critical to introduce a grazing management plan to get the most out of your pastures. 

“Graziers need to organise their grazing to deal with the complex and dynamic nature of their property systems. Often this involves decisions which influence the effective utilisation of the available feed within, and between seasons, across the whole property.”

More than 20 people attended the workshop at Worona Station, Reid River.

Sam Skeat from Mulloon Institute, who worked with the LeFeuvre family on the rehydration project, explained what gully erosion remediation works were carried out, and how cattle are being used as a tool to regenerate the grassland.

Keeping water on the land a key goal of the LDC project

LANDSCAPE rehydration initiatives underpin a number of NQ Dry Tropics activities that are being carried out in the BBB catchment area.

A demonstration site and learning hub at Mt Pleasant Station, Bowen, is trialing how regenerative agriculture practices can restore landscape function in a production grazing landscape.

The design is based on natural sequence farming principles and was designed and supervised by the Mulloon Institute.

LDC has promoted the rehydration work of the Mulloon Institute that uses the principles of Peter Andrews and ‘Natural Sequence Farming’ which target on-ground works to reduce erosion and increase rehydration of the land.

There’s more information on the hub available here.

Published by four titlesCirculation - 8,780

Published by two titlesCirculation - 9,965

 

 

 

KEQ #1

Figure 1. Total fine sediment reduction by project type and erosion source. Inset shows the proportion of the total project area for each project type.

These estimates have been calculated using two methods: 

1) The pollutant reduction component of the Alluvium/Great Barrier Reef Foundation (GBRF) investment tool for hillslope and streambank erosion management projects; 

2) The Reef Trust Gully Toolbox method for gully erosion management projects. The LDC Water Quality Report 2020 (Waterhouse et al., 2020) highlights that a number of assumptions underlay these calculations, therefore these figures should be treated as the best available estimate of sediment reductions to date.

Preventing sediment from reaching the Great Barrier Reef

Each wet season sediment is washed into local waterways and out to the Great Barrier Reef (GBR). 

Most sediment is very fine, and can stay suspended for a long time and can travel great distances. Valuable topsoil is lost from production, and increased concentrations on the reef can be harmful to seagrasses and corals. 

Landholders in the BBB have completed 69 on-ground water quality practice changes, and it is estimated that these have contributed a fine sediment reduction of 6,154 tonnes per year from reaching the GBR. 

Of this, approximately half of the sediment savings are attributable to grazing land management changes on hillslopes and streambanks, and the other half as a result of gully remediation treatments across a broad range of scales, as shown in the graphs above. 

The table below also highlights the relatively small area of intervention in the gully management projects compared to the large sediment savings that these can achieve - 60 per cent of the sediment savings over only 4 per cent of the project area.

Table 1. Estimated sediment reductions (tonnes) from projects completed in the LDC Project to date.

KEQ #2

*GLMWW = Grazing Land Management Wire and Water

KEQ #3

*The Exploring New Incentives activity area has provided an opportunity for graziers to adopt improved land management practices through a range of activities. For some of these properties, it was the first time they signed contracts for on-ground works.

KEQ #4

The LDC project monitors four gully sites (represented in this table) with gold standard equipment and analysis, carried out by CSIRO.

Results have been compiled in a preliminary report from Bartley et al (2020), with the final report expected to be released by the end of 2020. The preliminary report shows all four sites have indicators of improvements, notably the Strathbogie and Mt Wickham sites.

KEQ #5

KEQ #6

KEQ #7
KEQ #8

Published in The Northern MinerCirculation - 2,041

Published by four titlesCirculation - 8, 780

 

Published by four titlesCirculation - 8,780

 

 

 

 

Published by four titlesCirculation - 8,780

 

Reef regulations - grazing, standard conditions

  1. For land in good or fair condition (more than 50 per cent ground cover at 30 September), continue using measures to maintain land condition.
  2. For land in poor condition (less than 50 per cent ground cover at 30 September), steps must be taken to improve land condition.
  3. For land in degraded condition (less than 20 per cent ground cover at 30 September), steps must be taken to improve land condition OR prevent areas from further degrading or expanding.
  4. Keep records of measures taken and also of agricultural chemicals, fertiliser and mill mud or mill ash applied to land.
Published by two titlesCirculation - 4,006

Published by one titleCirculation - 7,207