South East Queensland developer&nbsp;<a href="https://www.apartments.com.au/developers/gardner-vaughan-group">Gardner Vaughan Group</a>’s entry into the Gold Coast apartment market has progressed from pipeline to market, with its Chevron Island project Bronze on Chevron now formally available to purchase ahead of a planned 2029 completion.

The 119-apartment development on Mawarra Street marks the Brisbane-headquartered builder-developer’s first residential play in the Gold Coast, following its expansion south from Brisbane and the Sunshine Coast.

<a href="https://www.apartments.com.au/new-apartments/bronze-on-chevron-8-mawarra-street-surfers-paradise-qld-4217">Bronze on Chevron</a> comprises a mix of two-, three- and four-bedroom residences, with pricing starting from just over $1.5 million. The project is being delivered under Gardner Vaughan’s fully integrated model, with the group acting as both developer and builder, a structure it has consistently applied across its South East Queensland portfolio.

[smartcode_project:default project_id=107520 project_image_fid=367182]

Architecture has been designed by <a href="https://www.apartments.com.au/architects/cottee-parker-architects">Cottee Parker</a>, with landscape architecture by <a href="https://www.apartments.com.au/landscape-architect/jeremy-ferrier-landscape-design">Jeremy Ferrier</a>. The building presents as a single-tower scheme, with a focus on maximising outlook across both the Surfers Paradise skyline and the Nerang River.

Apartments have been planned with open-plan living zones extending to generous balconies, a response to the site’s dual-aspect positioning between river and ocean. Interiors follow a restrained coastal palette, with two colour schemes offered, and an emphasis on natural light and cross-ventilation.

[smartcode_project:default project_id=107520 project_image_fid=367181]

Resident amenity is concentrated across more than 1,250 sqm and includes a resort-style pool, gym, yoga lawn and rooftop entertaining areas. A function space with catering facilities forms part of the upper-level offering, alongside north- and south-facing outdoor areas.

Ground level will incorporate two retail tenancies, intended to extend the existing village character of the surrounding streets.

&nbsp;

[smartcode_project:default project_id=107520 project_image_fid=367200]

The project sits within walking distance of Thomas Drive’s established dining strip, while maintaining proximity to <a href="https://www.apartments.com.au/developments/surfers-paradise-qld-4217">Surfers Paradise</a> beach and broader Gold Coast amenity. The location, positioned on Chevron Island between the river and coastline, has increasingly attracted mid- to high-density development in recent years as the precinct evolves beyond its low-rise origins.

Gardner Vaughan’s move into the Gold Coast was first signalled in 2025, with the group identifying the region as a natural extension of its operations. Chief Executive Officer Simon Betteridge described the expansion as both “strategic and natural”, citing demand for well-designed apartments in lifestyle-driven markets.

Construction is expected to complete in early 2029.

[smartcode_project_cta:default project_id=107520]

Joel Robinson

Gardner Vaughan brings Bronze on Chevron to market as Gold Coast debut

One of the penthouses at Lily Lane, the latest stage of Carrington Place by Ellipse Property, has set a new local apartment price record.

The four-bedroom residence, purchased by a local downsizer, sold for $5.75 million—around 75 per cent higher than the previous record of $3.3 million.

Over 40 per cent of the first release of apartments at&nbsp;<a href="https://www.apartments.com.au/new-apartments/lily-lane-at-carrington-place-castle-hill-32-carrington-road-castle-hill-nsw-2154">Lily Lane</a> have already been snapped up just six weeks since it launched to the market.

&nbsp;

Located at 32 Carrington Road, <a href="https://www.apartments.com.au/developments/castle-hill-nsw-2154">Castle Hill</a> and designed by award-winning architects <a href="https://www.apartments.com.au/architects/ptw">PTW</a>, Lily Lane is directly opposite the Hills Showground Metro station. It offers a total 213 units over two 12-storey towers - a mix of 67 one-bedroom, 100 two-bedroom and 46 three-bedroom apartments - with a ground-floor retail offering.

[smartcode_project:default project_id=151821 project_image_fid=368352]

Blake Schulze, National Director – Residential at <a href="https://www.apartments.com.au/project-marketer/colliers">Colliers</a>, says around 44 per cent of buyers are&nbsp;owner occupiers, with 35 per cent being investors and 21 per cent first homebuyers.

“Developments of this calibre are very rare in the Hills District, and Lily Lane’s sales success demonstrates the depth of demand for over-sized apartments that genuinely compete with freestanding homes," Schulze says.

"We are seeing particular demand from downsizers who want to remain in the area but transition into spacious, high-quality apartment living."

On the penthouse sale, it says it shows buyers&nbsp;are prepared to pay a premium for scale, quality, and direct access to the Metro.

[smartcode_project:default project_id=151821 project_image_fid=368351]

One-bedroom apartments are sized from 50-72 sqm with prices starting at $745,000, while two-bedrooms are priced from $990,000 with sizes from 75 to 132 square metres. Three-bedroom floorplans are sized between 97 and 182 sqm,, with prices starting at $1,395,000.&nbsp;

The three remaining penthouses, spanning up to 262 sqm, are priced from $2.9 million.

Over 75 per cent of apartments include dedicated studies, multipurpose rooms or family rooms, with select layouts offering walk-in pantries and laundries. Apartments are appointed with premium Miele appliances including ovens, washing machines, dryers, gas cooktops and dishwashers, while larger residences also incorporate integrated Miele microwaves, Fisher &amp; Paykel integrated refrigerators and five-burner Miele cooktops.

[smartcode_project:default project_id=151821 project_image_fid=360285]

Lily Lane will be constructed by award-winning iCIRT-rated builder <a href="https://www.apartments.com.au/builders/decode">Decode Group</a>, with construction to commence in mid-2026 and expected to complete early 2029.

Carrington Place comprises more than 800 apartments and is being delivered across multiple stages, with completion expected in 2032. Integrated with neighbouring bushland, the project will feature over 20,000 sq, of outdoor recreational area, including a one-kilometre boardwalk to Fred Caterson Reserve.&nbsp;

The Hills Showground Metro Station is just a two-minute walk away, offering fast connectivity to Sydney’s CBD, North Sydney, Chatswood, Macquarie Park and Norwest Business Park.

[smartcode_project_cta:default project_id=151821]

Ellipse sets Castle Hill apartment record with $5.75 million Lily Lane penthouse sale

Fresh off completing its Delano Crows Nest development, Lindsay Bennelong has lodged plans for its next project, this time turning its attention back to the beach.

The developer, started 20 years ago by Clarendon Homes founder Peter Campbell, is proposing a 37-apartment scheme at <a href="https://www.apartments.com.au/new-apartments/17-25-ashburner-street-manly-nsw-2095">17-25 Ashburner Street</a>, Manly, positioned between the southern end of <a href="https://www.apartments.com.au/developments/manly-nsw-2095">Manly</a> Beach and East Manly Cove.

Lindsay Bennelong called on local architecture firm Platform Architects to design the new building, given their success at Finn, Lindsay Bennelong's current luxury apartment project on North Steyne.&nbsp;

According to the Design Verification Statement by Bridie Gough of Platform Architects, the proposal “relates to the current context but also the desired future character of taller buildings suitable to the new planning controls.”

The site has been identified as a Low to Mid-Rise Housing (LMR) location, given its position within 400 metres of the Manly Town Centre E1 Business Zone. The LMR controls are intended to unlock additional housing supply in well-located areas close to public transport, allowing developers to seek increased height limits to support greater density.

“The proposal seeks to provide this increased level of housing whilst being respectful of some of the smaller scale buildings also nearby,” the statement reads.

Lindsay Bennelong Development Director Leigh Manser said the project has been carefully aligned with the intent of the LMR controls. The proposal will significantly increase housing yield on the site, replacing four houses and 10 apartments, comprising 25 bedrooms, with 37 new apartments delivering a total of 94 bedrooms, whilst remaining compliant with the LMR controls.

“Sydney is in a severe undersupply, and delivering more dwellings and more bedrooms than what currently exists is exactly what the LMR policy is designed to activate,” Manser said, noting that nine of the apartments will be allocated as affordable housing for frontline workers.

“We have already commenced discussions with our community housing provider to determine the rental levels that frontline workers can realistically afford in this location,” he said. “These will need to sit well below the standard affordable housing benchmark of 20 per cent below market rent, and that has been factored into our feasibility and pricing.”

<img alt="Manly" data-entity-type="file" data-entity-uuid="ad03000f-19f9-48b4-b27d-e85ca800a1da" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-04-30%20at%208.41.59%E2%80%AFAM.png?VersionId=a.txHwCZgbCInlQ6QXbIrI.umvW1T.r8" />

The design of the building incorporates a wave-like indentation running through the façade, referencing the nearby coastline and anchoring the building within its local context.

The&nbsp;Design Verification Statement says careful consideration has been given to the articulation of the building, ensuring the bulk is broken down to a more human scale through a defined four-storey podium."

The scheme includes a mix of one-, two- and three-bedroom apartments, as well as a full-time building manager's office and wellness facilities including a sauna and a gym.

“The design ensures a high level of amenity, with apartments offering generous private open space, many with expansive views, and all with comfortable proportions."

<img alt="Bennelong" data-entity-type="file" data-entity-uuid="6a7f2812-72a1-4959-84b0-997e8cd88aed" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-04-30%20at%2010.15.50%E2%80%AFAM.png?VersionId=6iMxU3MkXmHVHAoNhYBjnqgka8CUZNbk" />

<a href="https://www.apartments.com.au/developers/lindsay-bennelong-developments">Lindsay Bennelong</a>&nbsp;is currently developing Finn Manly, just four full-floor luxury apartments on North Steyne. They recently welcomed residents to its 81-unit Delano Crows Nest development, a&nbsp;carefully scaled infill project designed to bridge&nbsp;<a href="https://www.apartments.com.au/developments/crows-nest-nsw-2065">Crows Nest</a>’s lively village centre with its surrounding heritage streets.

Designed by&nbsp;<a href="https://www.apartments.com.au/architects/ajc-architects">AJC Architects</a>,&nbsp;<a href="https://www.apartments.com.au/new-apartments/delano-crows-nest-27-57-falcon-street-crows-nest-nsw-2065">Delano</a>&nbsp;is arranged across three low-rise buildings, incorporating a mix of one, two, and three-bedroom apartments alongside a limited number of townhomes addressing Hayberry Lane. The architectural approach drew on the area’s Art Deco lineage, reinterpreted through contemporary detailing and framed by landscaped communal gardens.

The developer also has a development site in Maroubra.

First look: Lindsay Bennelong's new Manly apartment development revealed

Fifty-nine residences across 37 levels. No more than two per floor. With 80 per cent now sold, what remains at <a href="https://www.apartments.com.au/new-apartments/madeline-by-mosaic-broadbeach-22-mary-avenue-broadbeach-qld-4218">Madeline by Mosaic</a> is a short list.

Madeline was always conceived at a scale that sits outside the normal register of Gold Coast apartment living. The residences are half- and full-floor configurations, with the largest spanning more than 400 sqm, dimensions that place them closer to the penthouse end of the market regardless of where they sit in the building.

That scale is the organising principle of everything else: how the floorplans are laid out, how the materials read, how the connection between inside and outside works.

[smartcode_project:default project_id=150135 project_image_fid=355941]

The interiors were developed in collaboration with <a href="https://www.apartments.com.au/architects/fraser-partners-0">Fraser &amp; Partners</a>, the architecture practice&nbsp;<a href="https://www.apartments.com.au/developers/mosaic-property-group">Mosaic</a> brought in as design partner for the first time on this project. The palette runs to natural stone, textured timbers, and soft metallics, materials chosen as much for their tactile quality as their appearance.

Light cleverly shifts across surfaces through the day, and the design is explicit about wanting that to be noticed. Full-height glazing runs across the primary living areas, and where the building faces east toward the ocean, those walls of glass are doing real work: framing a view corridor that the site's position directly opposite Broadbeach State School's playing fields keeps permanently open.

That outlook is the site's most consequential asset. In a suburb where new towers continue to rise, a protected view line is genuinely rare, and the Mary Avenue address secures it. Residents at Madeline will look out over open parkland rather than the rear of another building, a distinction that becomes more meaningful with each new development approved nearby.

[smartcode_project:default project_id=150135 project_image_fid=355939]

The private outdoor spaces are sized to match the residences themselves. Terraces on the upper levels frame uninterrupted ocean panoramas, and the planning ensures that living areas extend into those outdoor zones rather than treating them as separate attachments. The flow between the two is part of the design intent, not an afterthought.

Inside, the finish specification reflects the same approach. Rich stone benchtops, warm timber joinery, bespoke hardware, each element specified to hold up over time rather than read as a moment in a particular trend cycle.

[smartcode_project:default project_id=150135 project_image_fid=3409]

Beyond the residences, the amenity offering extends that register. A lap pool and sun deck anchor the outdoor space, alongside a magnesium pool, cold plunge, steam room, and sauna.

A commercial-grade gymnasium, residents' lounge, library, and boardroom round out a programme that functions more like a private members club than a standard building amenity floor.

Construction has commenced under Mosaic's in-house building arm, with completion scheduled for late 2028.

[smartcode_project_cta:default project_id=150135]

Madeline by Mosaic delivers penthouse-level living across every apartment

Developer Fortezza Group is the latest to take its new apartment development, <a href="https://www.apartments.com.au/new-apartments/the-belvedere-5-7-church-street-nelson-bay-nsw-2315">The Belvedere in Nelson Bay</a>, to the NSW Government.

Fortezza, predominantly a South East Queensland developer, is the latest to apply for State Significant Development&nbsp; status through the NSW Government's Housing Delivery Authority, a pathway becoming favoured by developers to speed up the approval process.

They are planning 57 two- and three-bedroom apartments across 5-7 Church Street and 42 Donald Street, near d'Albora Nelson Bay Marina. The diverse apartment mix has sizes from just over 80 sqm to the largest three-bedroom penthouses that reach nearly 200 sqm.

<img alt="Fortezza" data-entity-type="file" data-entity-uuid="090360e1-66d7-43ad-b686-aba81f173bf2" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-04-29%20at%2010.22.40%E2%80%AFAM.png?VersionId=DMqF96eBZolqSAAAcugX0l66ueWng66m" />

Fortezza calls the project a "piece of Istria in Nelson Bay,"&nbsp;referring to the largest peninsula in the Adriatic Sea, shared by Croatia (90%), Slovenia, and Italy, which is known for its Roman history, Venetian-style coastal towns and inland hilltop villages.

They say the The Belvedere is strategically positioned at the apex of Nelson Bay, offering unrivalled views of the ocean, the bay and captivating topography of the area.

"Our commitment to maintaining the integrity of every view and sight line has been relentless," Fortezza Group says.

"Through extensive modelling and analysis, we ensure that each apartment enjoys the natural beauty of Nelson Bay, regardless of future developments. Each design element is carefully curated to harmonise with our European heritage, drawing profound inspiration from the Roman architectural marvels in Istria. The arches, the cascades of greenery and the stonework that define our project pay homage to the structures that once exemplified Roman grandeur."

Residents will have access to a pool, communal green spaces, an office and a coffee shop.

First look: Fortezza Group takes The Belvedere, Nelson Bay apartment development, to NSW Government

Soil Quality

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<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.
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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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