Sydney developer&nbsp;<a href="https://www.apartments.com.au/developers/central-element">Central Element</a>&nbsp;is doubling down in Drummoyne, lodging plans for a boutique apartment development on St Georges Crescent, only one-kilometre down the road from its first Drummoyne development, Bianca.

The new project at 15A-21 St Georges Crescent,&nbsp;a&nbsp;1,701sqm north-facing site overlooking Iron Cove, will have 45 apartmnts across 10 levels. Eight of the units will be dedicated to affordable housing.

The site sits within walking distance of Drummoyne Village, Birkenhead Point, ferry services and the Bay Run, and offers harbour views towards the Sydney Harbour Bridge and CBD skyline.

Designed by MHN Design Union, the development will deliver a mix of one, two and three-bedroom apartments, alongside resident amenity including a gym, landscaped communal open space and three levels of basement parking.

The project has been lodged under the NSW Government's Low and Mid-Rise Housing reforms, with Drummoyne Village identified as a town centre capable of accommodating additional housing supply.

Central Element acquired the site earlier this year as part of its continued expansion across Sydney's eastern suburbs, lower north shore and inner west.

The developer's current pipeline includes luxury apartment projects Pearl Bondi and a separate development on Lamrock Avenue in Bondi, a residential project in Barry Street, Neutral Bay, and a mixed-use seniors living community in Greenwich.

Central Element Managing Director Nathan Chivas said the project would address a shortage of new owner-occupier housing opportunities in Drummoyne.

"While we're seeing a significant shift across Canada Bay as major infrastructure investment, population growth and planning reform drive a new chapter for the region, in suburbs like Drummoyne there remains a genuine shortage of new boutique luxury housing opportunities for owner occupiers," Chivas said.

"Sites of this nature are increasingly difficult to secure, particularly those that combine a north-facing aspect with direct water outlook. Our St Georges Crescent project responds directly to the market demand, offering a level of exclusivity, outlook and lifestyle in the highly sought after suburb."

The development application has been lodged with the City of Canada Bay Council, with the project expected to launch to market in early 2027.

&nbsp;

Joel Robinson

Central Element seeks second Drummoyne apartment development

The NSW Government has unveiled plans that could deliver around 1,300 new homes across Nowra and Kiama, continuing its push to unlock housing in well-located regional centres along the South Coast.

The proposals, now on public exhibition, would pave the way for around 830 homes in Nowra and a further 450 homes in Kiama, while also introducing affordable housing requirements and increased building heights in key locations.

The larger of the two proposals is centred on Nowra, where the NSW Government is seeking to rezone land within the Mandalay and Riverfront precincts.

The Mandalay sub-precinct, located close to Shoalhaven Memorial Hospital, Nowra Library and the city's aquatic centre, could accommodate around 530 new homes. Around 30 per cent of housing delivered on Homes NSW-owned land would be dedicated to social and affordable housing, equating to roughly 100 homes. Building heights would increase from the current two-storey limit to between three and six storeys.

A separate rezoning proposal for the Nowra Riverfront Precinct would unlock a further 377 homes while creating stronger connections between the Shoalhaven River and the CBD. The plans include building heights ranging from five to 12 storeys, floor space ratios of up to 2:1 and a requirement for two per cent affordable housing.

Together, the two proposals would deliver more than 900 homes across the broader Nowra area, reinforcing the city's role as one of regional NSW's key growth centres.

The housing push builds on previous infrastructure commitments in the Shoalhaven, including government funding aimed at supporting thousands of future homes in West Nowra through upgrades to water and wastewater infrastructure.

Further north, the NSW Government is also progressing plans for the former Kiama Depot site, a two-hectare parcel near Kiama's town centre.

The rezoning proposal would transform the former industrial site into a residential community capable of delivering up to 450 homes. Buildings would range between six and eight storeys, with at least 10 per cent of homes allocated as affordable housing. The proposal also includes approximately 600 parking spaces and improved walking and cycling connections.

Planning Minister Paul Scully said the proposals are designed to increase housing supply in locations close to jobs, transport and services.

"For too long, families have struggled to find somewhere to live, and activating underutilised sites allows us to deliver the new homes these families need," Scully said.

"The Minns Labor Government is getting on with the job of unlocking well-located sites close to transport, jobs, and town centres and building the homes our communities need.

"These rezonings are about removing barriers to housing delivery and making sure land is put to better use so more people can find a place to call home within the communities they choose."

The latest rezonings form part of the Minns Government's broader strategy to accelerate housing delivery across NSW, particularly in established centres where existing infrastructure can support additional population growth.

Community consultation on the proposals is now underway, with feedback set to inform the final planning controls before the rezonings are determined.

Around 1,300 new homes earmarked for Nowra and Kiama as NSW Government pushes housing supply

<a href="https://www.apartments.com.au/developers/mrcb">MRCB International</a> has commenced construction on its latest Gold Coast apartment development, Maris, on the site of the former Sundale Motel in Southport.

The start of construction by <a href="https://www.apartments.com.au/builders/binah-constructions">Binah</a> follows an exceptionally strong sales campaign, with more than 90 per cent of apartments sold since launch. Every purchaser has been local, an&nbsp;indicator of confidence in both the development and Southport's evolution into a thriving CBD.

<a href="https://www.apartments.com.au/new-apartments/maris-southport-20-queen-street-southport-qld-4215">Maris</a> will deliver 192 residences across 20 levels. The project forms part of MRCB's Australian and New Zealand development pipeline now exceeding $1.6 billion in gross development value, alongside a growing portfolio of projects globally.

[smartcode_project:default project_id=134403 project_image_fid=350663]

The company also commenced construction on its $600 million 26 Vista residences in Surfers Paradise last year, following strong sales momentum, with over 70 per cent of residences sold.

Maris has been designed to meet evolving buyer demand, offering architecturally designed layouts suited to long-term liveability. The approach reflects a growing preference for quality and adaptability among Gold Coast buyers.

Positioned next to the Broadwater in the <a href="https://www.apartments.com.au/developments/southport-qld-4215">Southport</a> CBD, Maris sits directly opposite the Broadwater Parklands light rail station and within easy reach of retail, dining and lifestyle precincts, placing residents at the centre of one of the Gold Coast's most connected and rapidly maturing urban centres.

[smartcode_project:default project_id=134403 project_image_fid=372756]

Maris will offer a full suite of resort-style residential amenities, including a pool, gym and sauna, along with a rooftop level featuring decks, lounges and dining and yoga areas that command sweeping views across the Broadwater and out to the ocean.

Binah, a New South Wales headquartered company co-founded by Amen Zoabi and Khalil Hafza in 2008, has expressed its excitement at establishing its first partnership with MRCB.

Binah's Managing Director Khalil Hafza said partnering with MRCB on Maris is a significant moment for Binah.

"MRCB's financial strength and a track record that speaks for itself give this project a solid foundation, and this marks the beginning of what will be a long and successful relationship.

"With the right people, systems and partnerships behind it, Maris is set to become a significant addition to the Gold Coast's premium residential market."

[smartcode_project:default project_id=134403 project_image_fid=350664]

MRCB International CEO Ravi Krishnan said the project's progression to construction reflects both sustained demand and tightening conditions across the apartment sector, as well as MRCB's continued confidence in the Gold Coast market.

"Commencing construction at Maris is a significant step and reflects the depth of demand for quality apartments in well-connected urban locations," said Krishnan.

"Across Southeast Queensland, new apartment supply remains constrained, particularly in established precincts with infrastructure and amenity already in place. Projects like Maris are increasingly critical in meeting that demand, especially on the Gold Coast and in the city's CBD precinct."

[smartcode_project:default project_id=134403 project_image_fid=372761]

Krishnan said Southport's ongoing transformation, supported by infrastructure investment and long-term planning, was underpinning renewed buyer confidence.

"We're seeing a clear shift back towards well-located urban centres where infrastructure, connectivity and amenity are already established," said Mr Krishnan. "Southport is evolving into a more mature CBD environment, and that is being reflected in buyer behaviour."

Construction at Maris is anticipated to be completed in 2029.

[smartcode_project_cta:default project_id=134403]

Construction commences on MRCB’s $200m Maris Residences in Southport

Moonee Valley Park’s latest residential release <a href="https://www.apartments.com.au/new-apartments/the-eveline-at-moonee-valley-park-moonee-ponds-100-thomas-street-moonee-ponds-vic-3039">The Eveline</a>, has achieved a new benchmark for off-the-plan apartment sales in the suburb, with the sale of The Alexandra penthouse selling for $5,435,000.

Positioned on the top floor of a 16-level residential building, the three-bedroom, three and-a-half-bathroom penthouse features uninterrupted city skyline views across the future Valley racetrack.&nbsp;

The landmark sale comes as momentum at the precinct continues to build, with the Moonee Valley Racing Club progressing works on its new racetrack ahead of the 2027 Cox Plate. The transformative development will see MVRC reimagine the beloved Valley as a vibrant year-round entertainment and lifestyle destination.

Alongside a world-class racing experience, the historic precinct will be activated with events, hospitality and public green spaces designed to attract broader audiences, while breathing new life into one of Melbourne’s most iconic destinations.&nbsp;

[smartcode_project:default project_id=142519 project_image_fid=372786]

Development partners <a href="https://www.apartments.com.au/developers/hamton">Hamton Property Group</a> and Hostplus have delivered five residential stages over the past four years, the most recent in November 2025 with Trackside House and Stonepine House. The flourishing community is now home to almost 500 families.&nbsp;

The latest residential release, The Eveline, has recorded strong demand since launching publicly last July, securing more than $200 million in sales to date, satisfying its pre sales hurdle for construction to commence.&nbsp;

Hamton Founder and Executive Chairman, Paul Hameister OAM said, the sales&nbsp;team have been overwhelmed by demand for these unique homes in this unique project.

"Buyers continue to be predominantly hyperlocal and attracted by the 40 hectare botanic masterplan in Melbourne’s inner north west," Hameister said.

[smartcode_project:default project_id=142519 project_image_fid=372788]

Hamton’s Sales and Marketing Director Fergus Humphries said the team has achieved more than 70 sales over the past eight weeks, including the penthouse purchase by a local buyer.

"These results reinforce that, even in a challenging market, purchasers continue to be drawn to quality projects that offer more than just a home, they offer a lifestyle.”

Designed by Cera Stribley, the penthouse has been created with entertaining in mind, spanning close to 400 sqm of indoor and outdoor living space, including multiple terraces designed to capture sweeping views across Melbourne’s skyline, the new Valley racecourse and sunset views over Moonee Ponds.

Moonee Valley Park is one of Melbourne’s largest urban renewal projects, transforming the iconic racecourse site into a vibrant mixed-use neighbourhood integrating homes, parklands, retail, racing and community amenities.

[smartcode_project_cta:default project_id=142519]

Moonee Valley Park penthouse sets suburb record as sales surge clears construction benchmark

A company linked to one of Australia's largest privately owned cattle businesses has lodged plans for a new residential tower in <a href="https://www.apartments.com.au/developments/newstead-qld-4006">Newstead</a>, continuing the rapid transformation of one of Brisbane's most sought-after, inner-city precincts.

Bottletree Holdings, an entity associated with Stanbroke Managing Director Brendan Menegazzo, has submitted a development application for a 28-storey mixed-use tower at <a href="https://www.apartments.com.au/new-apartments/9-longland-street-newstead-qld-4006">9 Longland Street</a>, a site that made headlines last year when it changed hands in an off-market transaction that reportedly set a benchmark land rate for the suburb.

The proposal would replace an existing two-storey commercial building on the 1,510 sqm corner site with a Bureau Proberts-designed tower comprising 76 apartments, ground-floor retail, office space and a suite of resident wellness amenities.

<img alt="9 Longland" data-entity-type="file" data-entity-uuid="c710a836-568e-4382-bc91-3c34b8e80a8b" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-06-22%20at%209.41.45%E2%80%AFAM.png?VersionId=Vy.mQWBc7GA_a.vIBdxKqRC9XGjWalo2" />

According to planning documents lodged with Brisbane City Council, the development would comprise a mix of 36 two-bedroom apartments, 24 three-bedroom apartments and 16 four-bedroom residences, positioning the project firmly at the premium end of the market. The apartments would sit above a podium containing retail and commercial space, with three levels of communal recreation facilities spread throughout the tower. The proposal also includes 198 car spaces and 95 bicycle spaces.

Bureau Proberts has drawn heavily on Newstead's industrial heritage in developing the architectural response.

"Occupying a prominent corner in the heart of Newstead, the proposal draws from the area's industrial lineage of robust brick warehouses to deliver a distinctly contemporary response," the architects said in the design statement.

"It is conceived as a subtropical sanctuary and elevated private retreat embedded within one of Brisbane's most vibrant lifestyle precincts."

The design seeks to reinterpret the traditional Queensland vernacular through wraparound verandahs, deep shading elements and permeable facades that respond to Brisbane's subtropical climate.

<img alt="9 Longland" data-entity-type="file" data-entity-uuid="25524f59-395c-4825-8fad-9b639822fa8a" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-06-22%20at%209.42.09%E2%80%AFAM.png?VersionId=dlWlbpCc_g3Y6yTLGqRVKvGJvO2ubMJ3" />

Planning documents describe the building as embodying the principles of "buildings that breathe", a design approach increasingly favoured in Brisbane's apartment market as developers focus on natural ventilation and outdoor living spaces.

The tower itself would rise above a heavily landscaped podium designed to reference the woolstore architecture that helped define Newstead and neighbouring Teneriffe for generations. At ground level, fine-grain retail tenancies would activate Longland Street, Wyandra Street and the existing Wyatt Street laneway, further extending the pedestrian network that has become a hallmark of the Gasworks precinct.

The application notes that more than 54 per cent of the site would be dedicated to landscaping and deep planting, while approximately 1,750 sqm of communal recreation space would be delivered across multiple levels.

<img alt="Planning" data-entity-type="file" data-entity-uuid="fed3b189-1054-4b68-af5f-b0befc4a66e5" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-06-22%20at%209.42.19%E2%80%AFAM.png?VersionId=gqeE3cjsbnLAfeTUKA1HtPZfqDs6S4Xa" />

Bottletree paid $22 million for the 1,510 sqm development site, equating to more than $14,500 per sqm, a reflection of the strong demand for development opportunities in Newstead. The suburb continues to attract both developers and buyers, underpinned by the ongoing evolution of the Gasworks and Teneriffe precincts into some of Brisbane's most sought-after lifestyle destinations.

Brisbane City Council's Sustainable Growth Strategy and Inner City Strategy both identify Newstead as a priority growth precinct capable of accommodating additional housing density due to its proximity to employment hubs, public transport and lifestyle infrastructure.

The proposed tower joins a growing pipeline of high-end apartment developments in the suburb. Fortis recently launched <a href="https://www.apartments.com.au/new-apartments/crest-walker-newstead-12-kyabra-street-newstead-qld-4006">Crest &amp; Walker</a>, a 65-apartment owner-occupier-focused development on Kyabra Street, while Consolidated Properties Group is preparing to launch <a href="https://www.apartments.com.au/new-apartments/castile-47-skyring-terrace-newstead-qld-4006">Castile</a>, a 227-apartment waterfront project on Skyring Terrace.

Meanwhile, builder-developer BPG is planning its own Newstead project on Maud Street, comprising just over 100 apartments and more than 1,380 sqm of dedicated wellness and resident amenity spaces, further highlighting the shift towards lifestyle-driven apartment developments in Brisbane's inner-city market.

Newstead apartment boom continues with Longland Street tower plans

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

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<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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