<a href="https://www.apartments.com.au/developers/s-p-setia">SP Setia</a> has lodged plans for a $750 million, three-tower mixed-use precinct that would complete the long-running redevelopment of Carlton's former Carlton United Breweries site.

The proposal at <a href="https://www.apartments.com.au/new-apartments/185-195-queensberry-street-carlton-vic-3053">46-78 Bouverie Street and 185-195 Queensberry Street</a> spans a 6,468 sqm site, the last remaining undeveloped parcels within the former brewery's 2007 masterplan.

Designed by <a href="https://www.apartments.com.au/architects/cox-architecture">COX Architecture</a>, the development will comprise two purpose-built student accommodation towers and a third build-to-sell apartment tower above a shared commercial podium and basement.

Across the three towers, SP Setia is proposing 606 build-to-sell apartments and 1,499 student accommodation units containing 2,009 beds.

The apartments will sit in the tallest tower, which will rise nearly 200m and 55 storeys. It will become&nbsp;one of the more substantial new build-to-sell apartment projects at the northern edge of Melbourne's CBD.

The apartment mix is weighted toward smaller inner-city product, with 188 studios, 206 one-bedroom apartments, 192 two-bedroom apartments and 20 three-bedroom apartments

<img alt="First look: SP Setia plans three-tower finale for Carlton’s former CUB precinct" data-entity-type="file" data-entity-uuid="8271bc87-1b0a-41b7-ac73-a425ee375261" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/3_2.png?VersionId=G4lw23o90B1boX4k4dj7rdz2ZEajS9wy" />

Part of the precinct will be a large-scale&nbsp;3,684 sqm supermarket and a further 2,198 sqm of speciality retail, creating close to 5,900 sqm of new commercial space within the precinct.

But one of the biggest components of the proposal is what sits between the buildings.

Around 4,650 sqm, or roughly 72 per cent of the site, will be publicly accessible open space, incorporating plazas, pedestrian connections, landscaped laneways and retail spill-out areas.

The ground plane is intended to finally complete pedestrian connections envisaged when the CUB masterplan was first approved nearly two decades ago, stitching together Victoria Street, Queensberry Street, Bouverie Street and Swanston Street through the former brewery precinct.

Urbis said the development would "complete the CUB precinct", with the public realm providing important north-south and east-west connections through what is currently the final undeveloped portion of the masterplanned site.

SP Setia is also exploring a new linear park within the Bouverie Street road reserve, with the concept to be developed further with the City of Melbourne through the planning process.

The proposal is being pursued through the Victorian Government's Development Facilitation Program under Clause 53.23 for significant residential development with affordable housing.

The planning report acknowledges the proposed heights exceed those contemplated under the original Comprehensive Development Plan and masterplan, but argues the built-form context has changed considerably over the past two decades.

Urbis said the three towers would instead create a stepped transition between Carlton and the Hoddle Grid, rising progressively from the 94.1-metre Tower One along the Queensberry Street edge to the 199.44-metre Tower Three closer to the established CBD-scale buildings to the south.

<img alt="SP Setia" data-entity-type="file" data-entity-uuid="e885a07a-592c-40fc-bf82-e6dbaf32da54" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-08-21%20at%208.52.24%E2%80%AFAM.png?VersionId=7s_ErUkSKAdY1mAWp3GRZgMNCGtwhk5m" />

SP Setia plans to deliver the development across three stages.

Stage One would deliver the basement, podium and retail areas for the entire precinct alongside the first student tower. Tower Two would follow in Stage Two, before the 606-apartment Tower Three is delivered as the final stage.

If approved and delivered, the project would close out a redevelopment process that has been underway since the former brewery masterplan was approved in 2007, adding more than 2,600 student beds and apartments to a precinct already home to Swanston Central, the Barak Building, RMIT Design Hub and several large student accommodation developments.

&nbsp;

&nbsp;

Joel Robinson

SP Setia plans three-tower finale for Carlton’s former CUB precinct

Melbourne developer Lowe Living is seeking to add to its growing bayside apartment pipeline, filing plans for a boutique eight-residence development in tightly held Middle Park.

Lowe Living, which has built much of its development portfolio across Melbourne's affluent bayside and south-east suburbs, is behind the plans for the 730 sqm site at <a href="https://www.apartments.com.au/new-apartments/123-125-erskine-street-middle-park-vic-3206">123-125 Erskine Street</a>, just off Armstrong Street and within the Armstrong Street Neighbourhood Activity Centre.

The developer is seeking approval for a five-storey residential building above two basement levels, with just eight large-format apartments and 18 car spaces.

“This is a deliberately very different proposition for us,"&nbsp;Tim Lowe, Co-Founder of Lowe Living, said.

"Eight residences is exceptionally boutique, but that's precisely what this site calls for.

“There is a strong community in Middle Park and the surrounding suburbs who have spent decades building a life here. They no longer want the maintenance of a large period home, but they aren't prepared to compromise on space, quality or location. We think there is a real opportunity to capture that hyper local market. A site like this rarely comes to market.”

<img alt="Lowe " data-entity-type="file" data-entity-uuid="875fe572-0f14-4d90-9e11-55b28dd07731" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-08-21%20at%208.42.49%E2%80%AFAM.png?VersionId=GDNQRv9BfpR9r1zkZ5UDyUM4ZvpIksut" />

The low-density proposal has been designed by Cera Stribley and is being progressed through the Victorian Government's Great Design Fast Track pathway, having already secured eligibility from the Minister for Planning.

The Office of the Victorian Government Architect supported its eligibility after finding the proposal demonstrated consistency with the program's seven design principles, while the project's financial feasibility has also been independently confirmed by Invest Victoria.

The project is targeting the downsizer market, with the planning documents describing the homes as larger-format residences and noting the two penthouses could otherwise have been configured as four separate apartments.

<img alt="Lowe 2" data-entity-type="file" data-entity-uuid="60ab0987-2da6-4175-adac-315dcf6053c6" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-08-21%20at%208.43.15%E2%80%AFAM.png?VersionId=bOCPH0B2MFwlmaRW.TTCF9TzyifgVoQI" />

The site has dual frontage to Erskine Street and Canterbury Place and currently comprises a collection of commercial buildings used as offices, including a former heritage bakehouse, a former stable, a later gabled addition and a central courtyard.

It sits within the Commercial 1 Zone and the Armstrong Street Commercial Precinct heritage overlay, with the existing property classified as a contributory heritage place.

Heritage has subsequently played a significant role in Cera Stribley's design.

The front section of the former bakehouse facing Erskine Street will be retained, including its return walls, street-facing hipped roof and chimneys, while the Erskine Street façade and part of the western return wall of the former stable will also be incorporated into the new development.

Levels four and five will be set back five metres from the retained stable façade, while bricks removed through demolition are proposed to be salvaged and reused within the new building where possible.

<img alt="Lowe 3" data-entity-type="file" data-entity-uuid="e97927a9-a2de-4a0f-83b6-65451238abfa" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-08-21%20at%208.43.06%E2%80%AFAM.png?VersionId=VR44AChLrX9q1XPB9GvVQV.ALXXbe4gC" />

Rather than presenting as a single five-storey building to Erskine Street, Cera Stribley has broken the development into a series of distinct forms.

A three-storey infill element will sit between the retained bakehouse and stable façades, with the upper levels recessed behind the heritage fabric. Canterbury Place will similarly feature two three-storey podium forms, separated by a central pedestrian accessway, before the upper two levels step back from the street.

A pedestrian through-link will run through the centre of the project between Erskine Street and Canterbury Place, creating entrances from both sides of the site and introducing landscaping and communal areas through the ground plane.

Landscape architect Acre has designed planting across the ground level, private terraces and upper levels, including a feature canopy tree at level three and integrated planting and arbours across the level four terraces. Five existing Erskine Street trees are proposed to be retained.

Sustainability is also a significant component of the Great Design Fast Track application. The apartments are targeting an average eight-star NatHERS rating, with no residence below 6.5 stars, while the project has achieved a 75 per cent BESS score. Seven of the eight apartments are designed for cross-ventilation, with the remaining residence using mechanically assisted natural ventilation.

The plans also incorporate an 8kWp rooftop solar system, a 5,000-litre rainwater tank and infrastructure allowing future electric vehicle charging for every residence.

Lowe has a strong portfolio across Melbourne's blue-chip suburbs. They recently launched <a href="https://www.apartments.com.au/new-apartments/jardin-house-by-lowe-living-camberwell-335-camberwell-road-camberwell-vic-3124">Jardin House by Lowe Living</a> in Camberwell, their first development in the Stonnington LGA.

Lowe Living unveils Middle Park apartment development

Article summary

<ul data-end="888" data-start="289">
	<li data-end="442" data-section-id="8tsh6o" data-start="289">DVB Projects is preparing to launch its second Gold Coast apartment development, with demolition now underway at 137 Old Burleigh Road, Broadbeach.</li>
	<li data-end="573" data-section-id="1nyxl3e" data-start="443">The 34-level tower will comprise just 49 ultra-luxury residences, including half-floor, full-floor and penthouse apartments.</li>
	<li data-end="717" data-section-id="oiyimj" data-start="574">The launch follows strong demand at DVB's nearby Sea Glass project, which is more than 50 per cent sold and currently under construction.</li>
	<li data-end="888" data-section-id="epk9o9" data-start="718">The development adds to the transformation of Old Burleigh Road, with premium beachfront apartment projects continuing to reshape the tightly held Broadbeach strip.</li>
</ul>

<a href="https://www.apartments.com.au/developers/dvb-projects">DVB Projects</a> is preparing to launch its second Gold Coast apartment development, with demolition now underway on the Broadbeach site as the Sydney developer moves closer to bringing the ultra-luxury project to market.

The 34-level tower at <a href="https://www.apartments.com.au/new-apartments/137-old-burleigh-road-broadbeach-qld-4218">137 Old Burleigh Road</a> will comprise just 49 residences, ranging from half-floor apartments through to full-floor homes and a penthouse. The launch follows the strong sales performance of DVB's nearby Sea Glass development. More than half of the apartments at Sea Glass, on the other side of Broadbeach, have been snapped up, well ahead of its late 2027 completion

<img alt="DVB Projects to commence demolition on $320m Broadbeach luxury tower" data-entity-type="file" data-entity-uuid="2944b4be-c84e-4b54-8dc1-c712e76704c0" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/E02_Exterior_Street%20Level%20Entrance.jpg?VersionId=YoNig7pRdrE3HCue7sUj78LzJteeQf3H" />

The start of demolition at 137 Old Burleigh Road signals DVB Projects’ underlying confidence in the Gold Coast’s luxury beachside apartment sector.

“We see the Gold Coast as one of the most compelling lifestyle markets in Australia, particularly at the premium end where demand continues to deepen,” said Dean Brown, Managing Director of DVB.&nbsp;

“This project has been carefully designed to respond to that demand - delivering large-format residences with a level of quality, privacy and amenity that is still relatively rare in the apartment market on the beachside."

Brown says the site itself is "exceptional."

"Old Burleigh Road is one of the most tightly held beachfront strips, and opportunities to deliver a project of this scale and calibre in this location are extremely limited.”

<img alt="DVB Projects to commence demolition on $320m Broadbeach luxury tower" data-entity-type="file" data-entity-uuid="398f377a-c037-455e-9250-0c5e0d84c35b" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/I12_FF%20Balcony.jpg?VersionId=NwOiRWGMubR1c8wthuEfggklcja7al9." />

The project will comprise 40 half-floor residences of approximately 260 sqm, alongside eight full-floor residences spanning around 524 sqm.

A single penthouse will crown the building, featuring a private pool, barbecue area, indoor gym and dedicated entertaining spaces.

Residents will have access to a resort-style suite of amenities, including a 20-metre pool with daybeds, a gymnasium, hot and cold plunge pools, a sauna, and private residents’ lounge and dining facilities.

<img alt="DVB Projects to commence demolition on $320m Broadbeach luxury tower" data-entity-type="file" data-entity-uuid="d1642bb0-9a66-4427-a022-dfc0988c6287" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/A02_Pool%20to%20View.jpg?VersionId=c0IXPyn_Gp_Kn3XCwzMrqIVkAdCEwVXP" />

Sales agent Todd Matheson, of <a href="https://www.apartments.com.au/project-marketer/pezet-matheson">Pezet Matheson</a>, which is marketing both 137 Old Burleigh Road and Sea Glass, said 137 Old Burleigh Road would address a clear gap in the market for genuine luxury products.

“There are very few opportunities on the Gold Coast where buyers can secure a residence of this size and quality in a new building,” Matheson said.

“What we’re seeing is a growing cohort of downsizers and interstate buyers who still want space - they’re not willing to compromise on living area, entertaining or finishes.

“This project has been designed with that buyer in mind. It offers the scale of a home, combined with the convenience and security of apartment living, in one of the coast’s most desirable positions.”

<img alt="DVB Projects to commence demolition on $320m Broadbeach luxury tower" data-entity-type="file" data-entity-uuid="59aae0ca-5639-4320-8aca-d0bf60f48e43" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/E01_Exterior%20Hero.jpg?VersionId=DS8Zfy2WtgUEtdfe0TEUuf1W1GfcZq8S" />

Located on a 1,156 sqm site one block from the beachfront, the development will replace an ageing walk-up building and is expected to contribute to the ongoing transformation of the Old Burleigh Road strip into one of the Gold Coast’s most prestigious residential corridors.

With the development moving into the delivery phase, 137 Old Burleigh Road is slated to hit the market later this year.

[smartcode_project_cta:default project_id=145141]

DVB Projects to launch second Broadbeach apartment tower as demolition commences

<a data-end="327" data-is-only-node="" data-start="250" href="https://www.apartments.com.au/developers/norus-projects" rel="noopener" target="_new">Norus Developments</a> has lodged plans for a new apartment development in Clayton that would add further momentum to the suburb's emerging Green Street corridor.

Plans have been lodged for the consolidated site at <a href="https://www.apartments.com.au/new-apartments/1359-1365-centre-road-clayton-vic-3168">1359-1365 Centre Road</a>, where Norus is seeking approval for 218 apartments across a 12-storey apartment building designed by <a href="https://www.apartments.com.au/architects/life-architecture-and-urban-design">Life Architecture</a>.

The proposal sits within the Clayton Major Activity Centre at the threshold of the planned Green Street corridor, a landscaped pedestrian connection intended to improve links through the precinct towards Clayton Railway Station.

The development would replace the site's existing collection of low-scale residential and commercial buildings with a single consolidated building, introducing significantly greater housing density to this part of Centre Road.

A retail tenancy is proposed at ground level to activate the Centre Road frontage, accompanied by transparent street interfaces and landscaping intended to create a more pedestrian-focused edge to the development.

<img alt="First look: Norus Developments plans landscape-led apartment project for Clayton’s emerging Green Street" data-entity-type="file" data-entity-uuid="0a5a763a-d9e9-4253-af2f-88008de27ebf" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Clayton%20a.png?VersionId=S2WJJbat1XVkZwB9SnYtygirXgWHiklX" />

The building has been designed with stepped massing and upper-level setbacks to manage its transition towards surrounding residential properties. The planning report describes the approach as one that integrates the building into the landscape rather than treating landscaping as a secondary element.

"A strong landscape and public realm strategy underpins the proposal," Urbis states in the planning report.

"Public benefits include an affordable housing contribution, a new pocket park, generous landscaped setbacks, deep soil planting and integrated Water Sensitive Urban Design."

The report adds that these elements are intended to create "a permeable, pedestrian-focused ground plane that enhances walkability, supports urban cooling and reinforces the emerging Green Street character."

Biophilic and passive design principles extend through the residential levels, with planting, daylight, natural ventilation and views towards landscaped areas forming part of the amenity strategy.

Parking would be concentrated away from the public realm, with 145 car spaces proposed from the rear laneway rather than dominating the Centre Road frontage.

The proposal follows an extensive pre-application process with the City of Monash. Three formal meetings were held between the project team and Council from December 2025 to March 2026, with the scheme evolving through several concept iterations before the current design was lodged.

The project arrives as Clayton prepares for substantial change around its established activity centre and the wider Suburban Rail Loop precinct. Its position on Centre Road places the development within an existing concentration of shops, services and public transport, while the Green Street connection is intended to strengthen pedestrian access towards Clayton Railway Station.

First look: Norus plans landscape-led apartment project for Clayton’s emerging Green Street

<a href="https://www.apartments.com.au/developers/gardner-vaughan-group">Gardner Vaughan Group</a> has officially commenced construction on Bronze on Chevron, celebrating the sod turning of its first-ever Gold Coast development and marking a significant milestone in the company's continued expansion across South East Queensland.&nbsp;

Following the successful delivery of premium residential developments throughout Brisbane and the Sunshine Coast, <a href="https://www.apartments.com.au/new-apartments/bronze-on-chevron-8-mawarra-street-chevron-island-qld-4217">Bronze on Chevron</a> represents Gardner Vaughan Group's entry into the Gold Coast market. Bronze will deliver 119 one, two, three and four-bedroom apartments above two ground-level retail tenancies.

[smartcode_project:default project_id=107520 project_image_fid=367193]

The recent sod turning ceremony was attended by Deputy Mayor Mark Hammel, President of the Surfers Paradise Surf Life Saving Club, Cassandra Sedgman, project consultants, purchasers, project partners and invited guests to celebrate the commencement of construction.&nbsp;

Gardner Vaughan Group Chief Executive Officer Simon Betteridge said Bronze on Chevron represented an exciting new chapter for the business.&nbsp;

"We've spent almost four decades building homes that respond to the way people want to live, and we're excited to bring that experience to <a href="https://www.apartments.com.au/developments/chevron-island-qld-4217">Chevron Island</a>," Betteridge said.

"Bronze on Chevron is particularly significant because it marks Gardner Vaughan Group's first development on the Gold Coast following many successful projects across Brisbane and the Sunshine Coast."

[smartcode_project:default project_id=107520 project_image_fid=367183]

Betteridge said the ground breaking is a proud moment for the&nbsp;team and their purchasers, who can now see their future homes beginning to take shape.&nbsp;

"As both developer and builder, we're able to oversee every aspect of the project from design through to construction, ensuring the quality and attention to detail Gardner Vaughan Group has become renowned for."&nbsp;

Designed by acclaimed architectural practice <a href="https://www.apartments.com.au/architects/cottee-parker-architects">Cottee Parker</a>, Bronze on Chevron has been thoughtfully designed to complement Chevron Island's evolving streetscape while embracing its relaxed coastal lifestyle.

The development will offer generous residences with refined interiors, premium finishes and resort-style amenities, with completion anticipated in early 2029.&nbsp;

[smartcode_project_cta:default project_id=107520]

The development will offer generous residences with refined interiors, premium finishes and resort-style amenities, with completion anticipated in early 2029

Gardner Vaughan Group breaks ground on first Gold Coast development, Bronze on Chevron

Soil Quality

<html><body>
<img src="https://counter.theconversation.edu.au/content/68499/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1">
GUEST OBSERVER
In our recent study we found that 40 percent of 203 Sydney homes we sampled contain lead in garden soil above the Australian health guideline of 300 milligrams per kilogram (mg/kg). 
This presents a hazard because soil lead can adhere to or get absorbed into edible plants. An additional pathway of exposure occurs when contaminated soil dust enters homes and is accidentally ingested. Lead is a potent neurotoxin that affects childhood development. 
<h2>Urban agriculture and VegeSafe</h2>
Urban agriculture is becoming more popular across Australia. Almost half (48%) of all households in metropolitan areas are now growing some form of edible produce.
Most lead contamination is a result of the historical use of lead petrol and lead-based paint (now phased out) and previous industrial emissions. Scientists and regulators are well aware of these legacy issues, but the general public remains underinformed about the potential risks. 
To help urban gardeners assess contamination risks associated with their garden soils, we started the community science initiative VegeSafe in 2013. This program offers free soil metal screening to participants.
Each participant receives a formal report on their soil metal results and advice about what to do next if soils contain elevated concentrations of metals. We have provided 5,500 free soil metal tests to over 1,300 homes and community gardens (Australia-wide), the largest program and study of its kind in Australia. 
<h2>What did we find?</h2>
As well as the 40% of Sydney gardens containing soil above the 300 mg/kg Australian health guideline, approximately one in seven homes had soils lead levels greater than 1,000 mg/kg. Soil metal concentrations were typically greatest around drip lines. 
Soil lead concentrations were greatest in the City of Sydney and former local government areas of Leichhardt Municipal Council and Marrickville Council, which had mean soil lead concentrations of 883 mg/kg, 960 mg/kg and 689 mg/kg, respectively. 
<a href="https://www.propertyobserver.com.au/images/2017/01/17/image-20161122-14964-1w7krx6.jpg" target="_blank">Click to enlarge</a>
<img src="https://res.cloudinary.com/dz9xllyip/image/fetch/c_scale,w_580,q_auto:good/https://s3-ap-southeast-2.amazonaws.com/po.images/2017/01/17/image-20161122-14964-1w7krx6.jpg" alt="">
Soil lead concentrations of vegetable garden soils from 141 Sydney homes. Map represents one of four areas around homes (front yard, drip line, back yard and vegetable garden) in this study. Source: Rouillon et al. 2016
Homes with painted exteriors built before 1970 were more likely to have soils contaminated with lead. The highest levels are at homes 80 years or older. This is likely to have been caused by lead-rich paint, which contained up to 50% lead prior to 1970. Lead in paint was reduced to less than 1,000 mg/kg (0.1%) by 1997. 
We observed the environmental benefit of the withdrawal of lead from paints and leaded petrol (removed in 2002) in our study. Garden soils at newer homes contain the least lead. Soil lead concentrations decrease with distance from Sydney’s city centre, where there are more old homes and greater density of traffic and industry. 
<a href="https://www.propertyobserver.com.au/images/2017/01/17/image-20161122-10973-1aft5jx.png" target="_blank">Click to enlarge</a>
<img src="https://www.urban.com.au/images/2017/01/17/image-20161122-10973-1aft5jx.png" alt="">
Cross-section schematic of a typical inner-Sydney residential home with median soil Pb (lead) concentrations for painted pre-1970 homes, non-painted pre-1970 homes, post-1970 homes and reference homes. The vegetable garden is displayed at the rear of the back yard, as this was the case for the majority of homes. Source: Rouillon et al. 2016
<h2>Public health</h2>
Lead exposure is especially detrimental for children because their neurological and skeletal systems are developing. Adults are also adversely affected, with studies showing increased blood pressure and hypertension associated with sub-clinical exposures.
Toxicological evidence also shows that exposure reduces semen quality and extends the time to pregnancy. In short, lead is detrimental to all human systems and exposures should be avoided or minimised at all times.
Our study demonstrates lead contamination in garden soils is greater at painted homes than non-painted homes. Many pre-1970 Australian homes still contain paint with up to 50% lead on exterior walls, fences, eves, doors and window frames. 
The main risk of exposure arises when lead-based paint deteriorates or is removed improperly. Indeed, many home renovators unwittingly expose themselves and others due to a lack of knowledge of lead hazards.
Paints containing lead are no longer used in Australia, but remain on countless homes.
<h2>Reducing exposure</h2>
The United States Environmental Protection Agency introduced legislation specifically targeting houses with lead paint to prevent contamination and to minimise avoidable lead exposures. 
Unfortunately this regulatory gap has not been filled in Australia. Despite the widespread historic use of lead-based paints and the high proportion of exposure related to it, our data reveals a concerning legacy of soil lead contamination in older suburbs. 
We recommend that people residing at or planning to purchase or renovate homes built before 1970 should get their soils and paint tested for lead. Using a qualified lead-abatement decorator in older homes would also help prevent exposure. Where parents and homeowners think they may have caused exposure, their GPs can provide a blood lead test. 
Reducing even low-level exposures is critical, as demonstrated by Bruce Lanphear’s “prevention paradox” (see the image below). The graphic illustrates that the most IQ points across a population are lost from low-level lead exposures. 
<a href="https://www.propertyobserver.com.au/images/2017/01/17/image-20161122-14944-ruxd0e.jpg" target="_blank">Click to enlarge</a>
<img src="https://res.cloudinary.com/dz9xllyip/image/fetch/c_scale,w_580,q_auto:good/https://s3-ap-southeast-2.amazonaws.com/po.images/2017/01/17/image-20161122-14944-ruxd0e.jpg" alt="">
<div class="enlarge_hint"> </div>
Bruce Lanphear’s prevention paradox. The majority of IQ points lost to lead exposure occurs in children who have low-to-moderate exposure to lead. Adapted from Reference (Lanphear 2015)
<h2>What can gardeners do?</h2>
Where non-food-growing soils exceed the Australian soil metal guidelines, we recommend maintaining year-round cover of lawn or mulch to minimise dust generation. 
Where metal guidelines are exceeded in food-growing soils, we recommend either replacing existing soil with new, uncontaminated soil, or relocating the food garden to an above-ground vegetable plot (again with new soil). 
In this way, gardeners can exercise our motto, which is to carry on gardening knowing their soils are clean.
<a href="https://theconversation.com/profiles/marek-rouillon-139693" target="_blank">Marek Rouillon</a> is PhD Candidate, Macquarie University.
<a href="https://theconversation.com/profiles/louise-kristensen-124418" target="_blank">Louise Kristensen</a> is postdoctoral research fellow, Macquarie University.
<a href="https://theconversation.com/profiles/mark-patrick-taylor-11394" rel="author">Mark Patrick Taylor</a> is professor of Environmental Science, Macquarie University.
<a href="https://theconversation.com/profiles/paul-harvey-106637" target="_blank">Paul Harvey</a> is researcher of Environmental Science, Macquarie University.
<a href="https://theconversation.com/profiles/steven-g-george-317844" target="_blank">Steven G George</a> is researcher of Environmental Science, Macquarie University.
All are authors for The Conversation.
</body></html>

jchancellor-FAypfDUnLy

Elevated lead levels in Sydney backyards: here’s what you can do

<html><body>
<img src="https://counter.theconversation.edu.au/content/65332/count.gif" alt="The Conversation" width="1" height="1">
GUEST OBSERVER
Most people think of soil only in terms of the dirt that sticks stubbornly to their hands and shoes. But soil is much more than that.
A handful of soil is a small and very complex ecosystem which includes soil particles, pores, aggregates, organic matter and a staggering number of microorganisms, all of which interact to keep the soil healthy and productive.
Each soil is different. The primary factor determining the physical properties of a soil is particle size. Sandy soils have a coarse structure, large pores and little ability to hold on to water and nutrients, which makes them prone to leaching.
Clayey soils hold nutrients and water, but because the pores are small they are prone to waterlogging.
The pores between soil particles are important for water flow but also for the movement of gases. Particularly important is the exchange of oxygen with the atmosphere, because plant roots and most soil organisms need oxygen to breathe.
Sand, silt and clay particles are bound together to form aggregates. These aggregates form the skeleton, or matrix, for chemical and biological processes which are critical for soil functions.
<h2>Nitty-gritty</h2>
Organic matter and soil microorganisms play key roles in the formation and stability of aggregates.
Think of organic matter as being the glue or mortar between soil particles. But the organic matter needs be decomposed to be most effective. And this is where soil microorganisms come in.
Each gram of soil contains a billion bacteria, which is almost as much as the human population of China or India, and about 50 times the number of people in Australia.
And this number does not even include soil fungi. All these bacteria and fungi can coexist because they have different needs or don’t interact.
For example, a bacterium on one side of the aggregate is quite isolated from a bacterium on the other side of the same aggregate. So even if these two bacteria have similar needs, they don’t compete.
They may also not compete because they are not active at the same time. In a given soil condition, only a small proportion of the bacterial population is active. The majority are inactive (dormant) and come to life only when conditions are optimal for them.
Another reason for the staggering number of microbes in a gram of soil is the huge diversity. A gram of soil contains around a million different species. Among them are generalists but there are also specialists, such as those capable of fixing nitrogen from the atmosphere or degrading wood.
The food of the vast majority of soil microbes is organic matter, which is mainly plant matter. When plant matter gets into the soil, it is attacked by soil microbes for energy and nutrients.
This attack is aided by soil animals such as earthworms or mites. They mix the plant matter in the soil and its microbes, fragmenting it and thereby improving contact between plant matter and soil organisms.
During decomposition of plant matter, microbes multiply and produce carbon dioxide and nutrients for plant uptake. The dead microbes and the components of the plant matter that are very difficult to decompose help to bind the soil particles together.
This binding is also aided by slimes produced by microbes and the long filaments of <a href="https://website.nbm-mnb.ca/mycologywebpages/NaturalHistoryOfFungi/Thallus">fungal hyphae</a>. The aggregates formed in this way are stable, which is important for adequate water and air supply for plant roots and soil organisms.
If aggregates are not stable, such as in sodic soils, water and air supply are restricted and plants and soil organisms will suffer.
<h2>Feeding your soil</h2>
Maintaining a certain level of organic matter in soil is critical for sustained soil health and function. Organic matter not only ensures that aggregates are stable, but also acts like a sponge, holding water, which is particularly important in sandy soils.
Another important function of organic matter is supply of nutrients required by plants. As mentioned above, decomposition of plant matter releases nutrients and it also can bind nutrients which can become available later.
But organic matter also decomposes, so needs to be replaced regularly. You can do this by adding plant matter growing in your garden or from outside to the soil, either directly or after composting.
Compost is more stable in soil than litter or straw because it is already decomposed during the composting process. It is a good glue for soil particles and binds nutrients, but it will not supply much nutrients for plants.
Fresh young plant matter is a good source of nutrients, but also decomposes very quickly and may initially release more nutrients than the plants can take up.
Mature cereal straw is nutrient-poor and decomposes slowly. So for good nutrient supply and long-term soil productivity, you may have to supply a mix of different types of organic amendments.
Of course, you can bypass this organic loop by adding inorganic fertilisers. Plants will grow well, but you have to match supply and plant demand carefully, because most fertilisers are dissolved quickly.
In your garden, you may get the best results by combining organic and inorganic fertilisation: various organic amendments for long-term soil health and stability, and inorganic fertiliser to overcome short-term nutrient deficiencies.
Petra Marschner is professor of Agriculture, University of Adelaide and author for The Conversation. She can be contacted <a href="https://theconversation.com/profiles/petra-marschner-299098" target="_blank">here</a>.
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