WESTERN AUSTRALIA Grainbelt Crisis Report — Seeding Season 2026

Farmyard with many small birds on spilled grain around silos and a red tractor at sunrise or sunset

Mouse Plague • Fertiliser Crisis • Fuel Shortage • Soil Performance Solutions

HUDSON AGRI-SOLUTIONS

WA Grainbelt Crisis Report — Seeding Season 2026

Mouse Plague • Fertiliser Crisis • Fuel Shortage • Soil Performance Solutions

⚠  CRITICAL SEASON ALERT — APRIL 2026 Western Australian grain farmers face a compounding triple crisis at seeding: mouse populations at plague proportions across the Wheatbelt, fertiliser supply disruption caused by the Strait of Hormuz blockade, and diesel shortages forcing growers to cut cropping programs. This report details the situation, the science, and how Hudson Agri’s AgriFix, SoilPro, and DeCide systems help farmers protect every seed, every kilogram of fertiliser, and every litre of fuel invested.
ChallengeScale of ImpactKey Risk WindowHudson Agri Solution
Mouse PlagueUp to 8,000 mice/ha in WA paddocks. Est. $1B+ damage potentialAt-seeding, furrow targetingDeCide integrated pest strategy
Fertiliser Crisis20–30% global supply disruption. Port delays across WASeeding application window (Apr–Jun)AgriFix — make every kg work harder
Fuel ShortageMillions of litres shortfall across WA grain regionsPre-seeding, seeding, spraying operationsSoilPro — fewer passes, better yield per litre
Soil EfficiencyLow CEC, sandy soils losing nutrients rapidlyOngoing — limits all other investmentsSoilPro + AgriFix combined system

🐭 1. The WA Mouse Plague: What Growers Are Facing in 2026

1.1 Current Scale: Absolute Plague Proportions

Western Australia’s 2026 seeding season has been met by one of the most severe mouse infestations recorded in the state’s farming history. CSIRO rodent expert Steve Henry has described the situation as “absolute plague proportions”, with reports spanning the full length of WA’s grain belt from Geraldton in the north to Esperance in the south.

📊 Key Statistics — WA Mouse Plague 2026 Up to 8,000 mice per hectare recorded in WA grain paddocks. 3,000–4,000 burrows per hectare documented in Mid West, Wheatbelt and Goldfields-Esperance regions. GRDC formal warning issued March 2026 — burrow counts north of Geraldton as high as 40 per 100 m². CSIRO considers 200–300 mice/ha a serious cause for concern. Potential crop damage estimated at over $1 billion across WA. Kwinana West flagged as high-risk zone by CSIRO rapid-assessment monitoring.

Individual farms are reporting damage never previously encountered. On the Esperance south coast, growers have reported catching over 2,000 mice on a single property within weeks. In the central wheatbelt at Bulyee, farmers are applying bait for the first time in their property’s history, with canola already being chewed off at ground level in a five-metre radius around burrow sites.

The conditions that created this outbreak are now well understood by CSIRO. The massive 2025–26 WA crop — following a run of above-average seasons — provided unprecedented food supply to mouse populations through summer. Warm, stable breeding conditions compounded the problem, producing population explosions that are now rolling directly into the seeding window.

1.2 Why Seeding is the Most Critical Risk Window

Mice are most destructive during seeding operations. Freshly placed seed in furrows represents concentrated, accessible nutrition — exactly what exploding rodent populations need to sustain their numbers. The combination of seed placement, disturbed soil from seeder traffic, and the absence of canopy cover creates near-ideal foraging conditions for mice.

Crop StageMouse Damage TypeRecovery PotentialYield Impact
Pre-seedingGrain storage losses, burrow activityHigh — can be managed before cropLow if controlled
At-seeding (highest risk)Direct seed removal from furrowsNone — loss is permanentSevere — patchy establishment
Post-emergenceStem clipping, leaf damage, canola defoliationPartial — depends on densityModerate to severe
Grain fill / storageHead feeding, grain storage attackLimited — late seasonModerate

Research from the 2021 NSW plague — which cost rural NSW alone an estimated $660 million — calculated that once populations exceed approximately 800 mice per hectare, crop losses escalate rapidly and management becomes extremely difficult. WA is recording populations 10 times this level in some regions.

For growers already constrained by fuel shortages that prevent rapid re-working of paddocks, and fertiliser uncertainty that means every seed placement must count, mouse pressure at seeding is uniquely damaging. There is no second chance — an establishment failure due to seed removal simply becomes a yield loss with no recovery pathway.

1.3 High-Risk Regions in 2026

CSIRO’s monitoring network and field reports identify the following regions as carrying the highest current risk:

  • Mid West / Geraldton Zone — highest reported burrow densities, earliest seeding window
  • Central Wheatbelt — widespread activity, first-time baiting being undertaken on many properties
  • Goldfields-Esperance — southern coastal regions reporting exceptional population builds
  • Kwinana West — flagged by CSIRO rapid-assessment monitoring as high-risk
  • South Australia crossover — populations building on Adelaide Plains, Yorke Peninsula and Eyre Peninsula, with risk extending into WA’s eastern fringe

⚠️ 2. Fertiliser Supply Crisis: The Strait of Hormuz Effect on WA Farming

2.1 The Global Supply Shock

The 2026 fertiliser supply crisis facing Australian farmers has its origins in geopolitical disruption to global trade routes. The Strait of Hormuz — a narrow passage through which approximately 20% of global oil supply and significant volumes of fertiliser precursors are shipped — has been effectively closed to traffic as a result of escalating conflict in the Middle East.

🌍 Fertiliser Supply Chain Disruption — 2026 Roughly 20–30% of global fertiliser supply including urea, ammonia and phosphate originates from the Middle East. Closure of the Strait of Hormuz has halted fertiliser exports from Saudi Arabia, the United Arab Emirates, and Qatar. Australia’s largest ammonia plant has been offline for over two months following a power outage. The Perdaman urea plant on the Burrup Peninsula will not begin production until mid-2027. A planned Strike Energy facility in WA never broke ground. WA Shadow Agriculture Minister Lachlan Hunter has formally called for fertiliser vessels to be prioritised through WA ports.

The timing could not be more damaging for Australian farmers. Winter-season grain crops are sown between April and June, meaning the fertiliser disruption has coincided precisely with peak demand. While some growers secured supplies earlier in the year, many are facing genuine uncertainty about whether ordered product will arrive before seeding windows close.

WA’s largest grain producer, John Nicoletti — managing 200,000 hectares from Holleton to Beacon — has stated he has contingency plans in place and will play the season closely to get “optimum efficiency and profitability” from whatever supplies he can access.

2.2 Why WA Soils Magnify the Fertiliser Crisis

Western Australia’s grainbelt is characterised by a high proportion of sandy and sandy loam soils with naturally low cation exchange capacity (CEC). These soil types have limited ability to retain applied nutrients — particularly nitrogen and potassium — against leaching losses from rainfall or irrigation events.

In a season where fertiliser is scarce, the intrinsic inefficiency of WA’s soil types means that a double penalty applies: growers receive less fertiliser than they need, and a significant proportion of what they do apply is lost through leaching, volatilisation, or downward movement below the root zone before the crop can access it.

Soil TypeTypical CEC (cmol/kg)Leaching RiskNutrient Retention Capacity
Sandy soils (widespread WA)2–6Very HighVery Low — nutrients move rapidly with water
Sandy loam5–10HighLow to moderate — limited buffering capacity
Loamy sand4–8HighLow — poor aggregate structure
Clay loam (limited WA occurrence)15–30LowHigh — strong mineral retention

The consequence is that WA growers have historically compensated for poor soil retention by applying higher fertiliser volumes than would be required in higher-CEC soils. In 2026, that compensation strategy is not available — creating a situation where improved nutrient retention and fertiliser use efficiency are not optional improvements but operational necessities.

Professor Marit Kragt from the Centre for Agricultural Economics and Development at the University of Western Australia has noted that farmers may respond to supply shortfalls by planting fewer crops or turning to crops that require less fertiliser input — both outcomes that represent direct revenue losses at the farm level.

2.3 The Nutrient Use Efficiency (NUE) Gap

Even in normal supply conditions, nitrogen use efficiency in global cereal cropping systems is reported below 50% (Raun & Johnson, 1999). In WA’s sandy soils under elevated rainfall or irrigation, effective NUE can fall significantly lower. The major loss pathways are well established:

N Loss PathwayMechanismWA Risk LevelTypical Loss Range
Ammonia VolatilisationNH₄⁺ → NH₃ gas from surface ureaHigh (alkaline soils, warm conditions)10–40% of applied N
Nitrate LeachingNO₃⁻ moves below root zone with drainageVery High (sandy soils, winter rainfall)10–30% of applied N
DenitrificationAnaerobic conversion to N₂O/N₂ gasModerate (wet periods)5–15% of applied N
Downward movementNutrients migrate below active root zoneHigh (low CEC soils)5–20% of applied N

In a season where every kilogram of fertiliser is constrained by supply chain disruption and must be viewed as a scarce resource, reducing these loss pathways is the single most impactful agronomic lever available to WA grain growers.

⛽ 3. Diesel Crisis: When Farms Run Out of Fuel to Farm

3.1 The Fuel Shortage Reality

Separate to the fertiliser crisis, Western Australian farmers are facing a simultaneous diesel supply emergency. New data from more than 700 primary producers across regional WA shows fuel supply falling short of demand by millions of litres, with the most significant gaps in the grain-growing regions of the Wheatbelt and Mid West.

⛽ Fuel Crisis Key Facts — WA 2026 Farmers are being told diesel deliveries have stopped, with some warned supply may not resume for weeks. Independent fuel distributors in regional WA are being cut back first when wholesalers ration supply. Deep ripping, pre-seeding spraying, and seeding programs are being delayed or abandoned entirely due to fuel unavailability. Australia’s local refining capacity was lost when BP closed the Kwinana Oil Refinery in 2021, increasing dependence on imported product. WA’s largest grain producer is contingency planning against the possibility of cutting his planting program if fuel cannot be secured.

The political response has been bipartisan in its urgency. WA Shadow Agriculture Minister Lachlan Hunter has formally written to Premier Roger Cook demanding action to redirect supply to farmers as a matter of absolute urgency, noting that deep ripping and pre-seeding spraying — critical structural investments for the coming crop — have already been halted on multiple properties.

The fuel crisis is geopolitically linked to the same Strait of Hormuz disruption that is impacting fertiliser supply, compounding both problems simultaneously at the worst possible point in the agricultural calendar.

3.2 Why Fuel Scarcity Changes the Economics of Every Farm Input

When fuel is rationed, every pass across a paddock must be justified at a higher threshold of return. Growers who might ordinarily conduct multiple cultivation passes, re-work poorly established paddocks, or apply topdress fertiliser in response to crop demand are now forced to consolidate operations and prioritise ruthlessly.

This constraint has direct implications for soil management:

  • Deep ripping and structural tillage — high fuel-use operations that deliver long-term yield benefits — are being deferred
  • Re-seeding of mouse-damaged paddocks becomes economically impossible if a second seeding pass cannot be justified
  • Topdress fertiliser applications may be skipped even when soil tests indicate deficiency, reducing yield potential
  • Paddock monitoring and precision response applications are delayed as machinery movements are minimised

The net effect is that farm systems must perform more efficiently with fewer operational interventions — placing a premium on soil inputs that deliver sustained, multi-season benefit with minimal re-application labour.

OperationTypical Fuel Use (L/ha)Current Risk LevelImpact if Deferred
Deep ripping / subsoil break15–25 L/haHigh — being deferred across WAReduced root depth, subsoil moisture access
Pre-seeding cultivation8–15 L/haMedium-HighWeed control failure, poor seedbed
Seeding (primary pass)6–12 L/haCannot defer — criticalEntire crop not planted
Topdress fertiliser3–5 L/haHigh — many growers skippingNUE loss, yield reduction
Mouse baiting (aerial)N/ABeing prioritised where possibleSevere establishment failure if skipped

🌱 4. The Hudson Agri Response: AgriFix, SoilPro, and DeCide

At the centre of all three crises is a common challenge: how to maximise the return on every input invested — every seed sown, every kilogram of fertiliser applied, every litre of diesel consumed. Hudson Agri’s three-product system is designed to address precisely this challenge at the soil and nutrient level, improving system efficiency rather than increasing input volume.

AGRIFIX Fertiliser efficiency enhancer. Reduces nitrogen loss via volatilisation and leaching. Makes scarce fertiliser work harder in sandy WA soils.AGRI SOIL PRO Attapulgite clay + diatomaceous earth blend. Improves CEC, moisture buffering, nutrient retention, and root-zone stability in low-performing soils.DECIDE Integrated pest pressure support. Positioned for use in high-pressure environments such as mouse-affected regions to protect establishment and grain retention.

4.1 Hudson Agri AgriFix: Fertiliser Efficiency Under Supply Constraint

What AgriFix Does

AgriFix is a fertiliser efficiency and nutrient stabilisation system targeting the transformation-based losses that occur after fertiliser is applied. It operates at the critical nutrient-soil interface in the rhizosphere — the zone where fertiliser transformation rates, soil buffering capacity, and plant uptake timing determine how much of the applied nutrient actually reaches crop offtake.

In the context of the 2026 fertiliser supply crisis, AgriFix addresses the core efficiency problem: if WA growers are receiving 20–30% less fertiliser than normal due to supply disruption, improving nitrogen use efficiency by even 15–25% effectively restores a significant portion of the lost supply without requiring a single additional kilogram of imported product.

AgriFix MechanismLoss Pathway AddressedExpected Efficiency GainWA Relevance
Urease activity modificationAmmonia volatilisation from surface urea20–50% reduction in NH₃ lossHigh — warm sandy soils with alkaline zones
Nitrification managementNitrate leaching and denitrification10–30% improvement in N retentionVery High — WA’s sandy soils with winter rainfall
Uptake synchronisationNutrient availability/demand mismatch15–25% improvement in crop N recoveryHigh — all soil types and crop stages
Rhizosphere bufferingDownward nutrient movement below root zoneImproved nutrient access in active root zoneHigh — low CEC sandy soils

AgriFix and the 2026 Fertiliser Crisis: The Efficiency Equation

The fertiliser supply disruption is not uniform — some growers have secured supply, others are facing genuine shortfalls. In both cases, AgriFix improves the agronomic outcome:

  • For growers with full supply: AgriFix improves NUE, reducing the volume needed to achieve target yield outcomes and reducing cost of production
  • For growers with reduced supply: AgriFix restores the effective nutrient availability in the root zone, partially offsetting the physical shortfall
  • For all growers: AgriFix reduces the economic risk of losing applied fertiliser through leaching or volatilisation events during the high-rainfall seeding period

Critically, AgriFix is applied with fertiliser — it does not require a separate machinery pass, meaning it imposes zero additional fuel cost on the grower.

4.2 Hudson Agri SoilPro: Soil Performance When Inputs Are Scarce

What SoilPro Is

Hudson Agri SoilPro is a blend of attapulgite clay and diatomaceous earth — two high surface-area mineral materials with complementary soil chemistry and physical properties. SoilPro is designed to improve nutrient retention, moisture buffering, root-zone stability, and cation exchange capacity in low-performing soils. It is Australian-owned and Australian-made.

Attapulgite Clay: The Mineral Core of SoilPro

Attapulgite (also known as palygorskite) is a fibrous magnesium aluminium silicate clay mineral with exceptionally high specific surface area and unique needle-like crystalline structure. Its relevance to WA’s sandy soils is significant:

  • High surface area provides additional cation exchange sites for nutrient retention in soils with naturally low CEC
  • Fibre structure physically bridges sand particles, improving aggregate cohesion and reducing slaking under rainfall
  • Micropore network retains plant-available water against drainage in sandy profiles
  • Neutral pH and chemical stability make it compatible with a wide range of soil types and fertiliser systems
  • Attapulgite has been used in soil conditioning applications globally and is well-supported by peer-reviewed soil chemistry literature (Sposito, 2008; Brady & Weil, 2016)

Diatomaceous Earth: The Physical Structure Component

Diatomaceous earth (DE) is a siliceous sedimentary mineral formed from the fossilised remains of diatoms — single-celled aquatic organisms with highly porous silica cell walls. In soil applications:

  • High porosity and internal surface area contribute to water retention in the soil profile
  • Lightweight mineral structure reduces bulk density and mechanical impedance to root penetration
  • Silica chemistry provides physical durability — DE persists in the soil profile across multiple seasons
  • Contributes to soil physical structure independently of organic matter content, making it valuable in low-OM WA soils

SoilPro’s Role in the 2026 Crisis Context

SoilPro addresses the 2026 input crises in two specific ways:

CrisisHow SoilPro HelpsMechanismKey Benefit
Fertiliser shortageRetains nutrients in root zone longerIncreased CEC via attapulgite exchange sitesMore of what’s applied reaches the crop
Fertiliser shortageReduces leaching from sandy profilesMicropore water retention slows downward nutrient movementFertiliser stays in crop root zone
Fuel shortageMulti-season benefit from single applicationMineral persistence reduces re-application frequencyOne fuel investment delivers 2–3 season benefit
Fuel shortageImproves soil water holding capacityDE micropores + attapulgite surface retentionReduced irrigation passes and associated fuel use
Mouse plague aftermathSupports rapid re-establishment after damageImproved seedbed conditions and nutrient availabilityFaster compensatory growth where establishment was patchy

SoilPro and MaxSil: Complementary Mineral Systems

SoilPro is designed as a complementary product to MaxSil, Hudson Agri’s mineral soil buffering system. Where MaxSil operates primarily in the soil chemistry domain — providing high surface-area aluminosilicate mineral buffering and cation exchange capacity improvement — SoilPro addresses both the physical structure and the mineral chemistry of the root zone simultaneously through its dual-mineral blend.

Growers using both SoilPro and MaxSil benefit from:

  • MaxSil establishing the base mineral buffering and CEC improvement layer
  • SoilPro adding the physical structure improvement (aggregate stability, bulk density reduction) on top of the chemical foundation
  • Combined system delivering simultaneous improvement across soil physics and soil chemistry — aligned with integrated soil management science (Lal, 2015)

4.3 DeCide: Integrated Pest Pressure Support in Mouse Plague Conditions

DeCide is Hudson Agri’s integrated pest pressure support system, positioned as a component of a broader on-farm pest management strategy in environments where rodent pressure is impacting crop establishment and grain retention.

In the context of the 2026 mouse plague, DeCide addresses the core challenge of establishment protection:

  • Supporting integrated pest management (IPM) frameworks where baiting, crop monitoring, and product application are coordinated
  • Positioned for use in high-pressure seeding environments where seed placement into furrows creates concentrated, high-risk mouse foraging zones
  • Complementing on-farm baiting programmes (aerial and ground-based) as an additional layer of establishment protection
  • Reducing the risk of patchy establishment that would otherwise require a re-seeding pass — a fuel-intensive operation that many growers cannot currently afford
💡 The DeCide Positioning in 2026 In a season where re-seeding patchy paddocks may not be financially or logistically possible due to fuel constraints, protecting first-pass establishment becomes the primary priority. DeCide, used as part of an integrated mouse management programme, supports growers in maximising the probability that each seed sown becomes a plant counted at harvest.

🔗 5. The Integrated System: Why All Three Products Work Together

5.1 The Compounding Crisis Demands a System Response

The 2026 challenge for WA grain farmers is not three separate problems requiring three separate solutions. It is one interconnected system failure:

  • Mouse pressure reduces establishment success — fewer plants per hectare
  • Fertiliser scarcity means less nutrient applied per hectare
  • Fertiliser inefficiency in sandy soils means less of that reduced supply reaches the crop
  • Fuel constraints prevent remediation of underperforming paddocks
  • The result: compounding yield reduction with no operational pathway to compensate

A system response that addresses the soil efficiency at the foundation — retaining more of the available nutrient, protecting establishment success, and improving root-zone conditions to extract maximum value from whatever inputs are applied — directly addresses the compounding nature of the crisis.

5.2 How the Three Products Interact

Product CombinationCombined BenefitCrisis Addressed
AgriFix + SoilProAgriFix stabilises nutrients in the root zone; SoilPro ensures the root zone has the CEC and structure to retain themFertiliser shortage + soil efficiency
SoilPro + DeCideSoilPro improves seedbed conditions for establishment; DeCide protects that establishment investment from mouse predationMouse plague + fuel (re-seeding prevention)
AgriFix + DeCideDeCide protects the seed that carries seed-placed fertiliser; AgriFix ensures that fertiliser is efficiently used when the protected plant emergesMouse plague + fertiliser efficiency
All Three — Full SystemMaximum protection across establishment, nutrient efficiency, and soil physical function — every seed, every kilogram, every litre of fuel delivers maximum returnAll three crises simultaneously

5.3 Recommended Application Strategy for 2026 Seeding

ProductTimingApplication MethodPriority Level
Agri SoilProPre-plant incorporationBroadcast + tillage incorporation OR banded with seederHigh — especially sandy paddocks with history of leaching
AgriFixWith fertiliser application (seeding or topdress)Mixed with liquid fertiliser, coated on granular, or applied concurrentlyVery High — all fertiliser applications in 2026
DeCideAt or around seedingAs per product label and IPM programmeVery High — all paddocks in plague-affected zones
MaxSilPre-plant (ahead of SoilPro where possible)Broadcast + incorporationHigh — low CEC soils prioritised
🌱 Soil Performance Keywords: What Australian Growers Are Searching For attapulgite clay soil conditioner WA • diatomaceous earth soil amendment Australia • nitrogen use efficiency sandy soils • fertiliser efficiency enhancer WA grain • soil CEC improvement broadacre • mouse plague WA 2026 crop protection • urea volatilisation inhibitor Australia • soil structural conditioner wheatbelt • SoilPro AgriFix DeCide MaxSil • WA fertiliser shortage seeding 2026 • nutrient retention sandy soils • broadacre soil conditioner Australia

📋 6. Conclusion: The Efficiency Imperative

The 2026 WA seeding season has delivered a compounding set of challenges unprecedented in their simultaneous severity. Mouse populations at plague proportions are threatening crop establishment in the critical seeding window. Global supply chain disruption is reducing fertiliser access and driving prices higher. Diesel shortages are constraining operational flexibility across the Wheatbelt and Mid West.

In this environment, the strategic priority is unambiguous: every seed, every kilogram of fertiliser, and every litre of diesel must deliver maximum return. Soil system inefficiency — nutrients lost to leaching, crops lost to mice, inputs wasted on poorly structured root zones — is the enemy of farm profitability in 2026.

The Hudson Agri Soil Performance System ✅  AgriFix — Make every kilogram of fertiliser work harder. Reduce nitrogen losses in WA’s sandy soils through volatilisation inhibition, nitrification management, and nutrient synchronisation with crop demand. ✅  Agri SoilPro — Improve the soil system that holds everything together. Attapulgite clay and diatomaceous earth improve CEC, moisture retention, and root-zone structure — delivering multi-season benefit from a single application. ✅  DeCide — Protect the investment at establishment. In plague-level mouse pressure, protecting the seed-to-plant conversion is the most important agronomic action of the 2026 season.

For agronomists advising WA grain clients heading into a constrained 2026 season, the integrated SoilPro + AgriFix + DeCide system represents a direct response to the efficiency imperative: do more with less, protect every input invested, and build soil performance that compounds over time.

Hudson Agri — Australian-owned, Australian-made. Soil performance systems for real farming conditions.

References

Brady, N.C., & Weil, R.R. (2016). The Nature and Properties of Soils. Pearson.

Fageria, N.K., & Baligar, V.C. (2005). Enhancing nitrogen use efficiency in crop plants. Advances in Agronomy, 88, 97–185.

GRDC (2026). Formal mouse management warning for WA grain growers. March 2026. Grains Research and Development Corporation.

Hamza, M.A., & Anderson, W.K. (2005). Soil compaction in cropping systems. Soil & Tillage Research, 82(2), 121–145.

Henry, S. (2026). CSIRO rodent expert media statements on WA mouse plague, April 2026. CSIRO Agriculture & Food.

Hillel, D. (2004). Introduction to Environmental Soil Physics. Elsevier.

Hunter, L. (2026). Diesel and Fertiliser: The Two Essentials Powering Western Australia’s Economy. WA Opposition media release, March 2026.

Hunter, L. (2026). Hunter calls for fertiliser vessels to be prioritised at WA ports. WA Opposition media release, April 22, 2026.

Kragt, M. (2026). Winter crops need to be sown – but Australia’s farmers are worried about fertilisers and fuel. The Conversation / UWA, April 2026.

Lal, R. (2015). Restoring soil quality to mitigate soil degradation. Sustainability, 7(5), 5875–5895.

Raun, W.R., & Johnson, G.V. (1999). Improving nitrogen use efficiency. Agronomy Journal, 91(3), 357–363.

Six, J., et al. (2004). The role of soil structure in carbon stabilization. SSSAJ, 68(6), 1935–1945.

Sposito, G. (2008). The Chemistry of Soils. Oxford University Press.

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