Skyspec Regen Ag
Biome Driven Agriculture
Soil Health Checklist – Horticulture (Bowen–Gumlu Region, QLD)
Target crops: tomatoes, capsicums, melons, cucurbits
Primary soils: sandy loams, duplex soils (Sodosols), occasionally Vertosols
Climate context: dry tropics, high irrigation input, Reef proximity
Goal: Enhance productivity while reducing nutrient runoff, particularly dissolved inorganic nitrogen (DIN)
🧾 Section 1: Physical & Chemical Health
| Indicator | Target / Action |
|---|---|
| [ ] Soil pH (CaCl₂) | 5.5–6.5; lime if <5.2 |
| [ ] CEC | >8 cmol/kg; low CEC soils need split fertigation |
| [ ] PBI (Phosphorus Buffer Index) | Moderate; risk of leaching — monitor soil + leaf P |
| [ ] Infiltration rate | ≥25 mm/hr; test with ring infiltrometer |
| [ ] Surface crusting / sealing | Address via compost, mulch, biology |
| [ ] Subsoil constraints | Sodicity (ESP >6%), salinity, hard pans — gypsum if needed |
🧬 Section 2: BeCrop® Soil Biome Assessment
| Focus Area | Target / Management Insight |
|---|---|
| [ ] Fungal:Bacterial Ratio | Aim ≥0.3 for crop resilience; boost fungi with cover + inputs |
| [ ] Nitrifier/Denitrifier Balance | High denitrifier presence = lower nitrate risk; check pathways |
| [ ] PGPR (Plant Growth-Promoting Rhizobacteria) | Look for Bacillus, Pseudomonas, Azospirillum |
| [ ] Pathogen Risk | Track relative abundance of Fusarium, Pythium, etc. |
| [ ] Microbial Diversity Index | Target >3.5 (Shannon Index); higher = more functional redundancy |
🌿 Section 3: Management Checklist
| Strategy | Notes |
|---|---|
| [ ] Split fertigation of N | Reduce nitrate pulses and leaching risk |
| [ ] Use of biostimulants or biologicals | Compost extract, microbial inoculants (on seed/soil) |
| [ ] Mulch or cover crop residues | Reduce evaporation, buffer soil temp, feed biology |
| [ ] Avoid wet/dry extremes | Moisture fluctuation stresses microbes and roots |
| [ ] Rotation with legumes or biofumigants | Improve soil structure and reduce disease pressure |
📊 Section 4: Monitoring & Reef Reporting Relevance
| Indicator | Purpose |
|---|---|
| [ ] DIN loss risk | Correlates with nitrate-N in leachate, BeCrop nitrifier spike |
| [ ] NUE improvements | Match N use with uptake (Soil + tissue + yield) |
| [ ] Visual Soil Assessment (quarterly) | Compaction, structure, porosity |
| [ ] BeCrop test (annually) | Track changes in function, diversity, pathogen pressure |
| [ ] Paddock-scale leaching potential mapping | Match BeCrop zones to fertigation plans |
✅ Recommended Soil Health Practices – Bowen–Gumlu Horticulture
1. Compost + Carbon-Rich Amendments
Apply mature compost or vermicompost pre-plant to feed microbes and buffer nutrient leaching.
Use carbon-based fertiliser carriers to improve CEC in sandy soils and support microbial nutrient cycling.
2. Cover Cropping Between Cash Crops
Plant short-cycle cover crops (e.g. millet, cowpea, buckwheat, lablab) between veggie plantings.
Use multispecies mixes to build soil structure, reduce compaction, and feed diverse microbes.
Integrate legumes to increase natural nitrogen fixation and improve microbial balance post-intensive fertigation.
3. Biological Inoculants & BeCrop® Testing
Trial microbial inoculants (e.g. Bacillus spp., Trichoderma, mycorrhizae) to:
Promote root growth
Suppress pathogens (e.g. Pythium, Fusarium)
Improve phosphorus solubilisation and nutrient efficiency
Use BeCrop® to identify biological bottlenecks — especially in:
Microbial nitrogen cycling
Organic matter breakdown
Anaerobic zone detection (post-irrigation/flood)
4. Reduced Tillage + Permanent Beds
Adopt minimum till or shallow rotary hoeing where possible to preserve microbial networks.
Shift to semi-permanent bed systems to reduce compaction and allow microbial memory to build between rotations.
5. Living Mulches + BioMulch Applications
Use crop residues or purchased mulch between rows for weed suppression and moisture retention.
Where possible, integrate low-growing living ground covers between planting cycles to suppress weeds and enhance soil life.
6. Gypsum & Biological Support for Sodicity
In duplex or sodic subsoils, apply gypsum with biological stimulants to improve infiltration and microbial access to nutrients.
Deep rip only when sodicity is corrected and microbial support is in place.
7. Split Fertigation + Microbial Compatibility
Break nitrogen applications into small fertigation pulses aligned with crop uptake.
Avoid biocidal tank mixes where microbes or biofertilisers are applied.
Trial co-applications of microbial biostimulants with drip irrigation (e.g., bacterial or fungal mixes in low-chlorine water).
8. Pathogen Suppression via Biology
Support competitive exclusion and disease suppression (soil-borne and foliar) with biology-first strategies.
Use BeCrop® to monitor microbial community structure over time and adjust compost/cover species accordingly.
Downloadable Checklist
