22-feb-2013 - clinnick - deniliquin effluent disosal project
DESCRIPTION
Presentation made by Peter Clinnick to the Riverina branch of the Australian Society of Soil Science at a workshop held at 'Old Coree', Jerliderie, NSW on 22 February 2013. Presentation outlined how recommendations for effluent disposal on a sodic heavy clay were determined.TRANSCRIPT
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DeniliquinDeniliquin
Effluent Disposal Project Effluent Disposal Project
Land Resource, Irrigation Land Resource, Irrigation
and Enterprise Options and Enterprise Options
Peter ClinnickPeter Clinnick
Advanced Environmental Systems Pty LtdAdvanced Environmental Systems Pty LtdCreating a Sustainable FutureCreating a Sustainable Future
Tel (03) 5482 5882 Email: Tel (03) 5482 5882 Email: [email protected]@Echuca.net.au
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The key management considerations were:• Flooding• Soil sodicity• Nutrient loading• Soil and wastewater salinity impacts• Leaching and drainage management• Hydraulic loading and watertable impacts• Winter storage volumes and seasonal water use
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•A landlocked depression dominates the centre of the site
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Methods
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SOILSRed brown earth and (Sodosol) Deniboota sandy loam/loam
-Highest elevations and midslopes.Transitional Red brown earth (Sodosol) Marah clay loam
- Mid and lower slopes. Non self mulching clay (Vertosol) Riverina clay
-Drainage depressions.
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Site No 62 64 65 66 69 78 80.0 84.0 85 ECe (dS/m)
(0-10 cm) 5.46 0.90 0.74 1.67 1.98 1.41 1.04 0.52 0.58 ECe (dS/m)
(10-40 cm) 5.67 6.01 3.08 10.26 6.05 13.50 0.31 1.06 7.65
Salinity
0.668 dS/m wastewater
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Sodicity in the root zone
Site No 62 64 65 66 69 78 80.0 84.0 85 ESP % 0-10cm 17.40 8.30 0.70 18.70 0.71 16.40 6.50 11.20 8.40 ESP %
~10-40cm 25.80 21.60 3.08 36.30 3.04 22.80 5.90 7.95 33.10
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Effects of sodicity and compaction
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Controlled traffic
• Lasered furrow irrigation is the preferred option in this instance
• Some land (laser) grading may be required before furrows can be constructed
• It is important for plant productivity that the extent of land grading be minimised
The system advantage : • It is compatible with controlled traffic management • Less capital intensive than dripper or sprinkler systems
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Economic: High establishment costs and low returns c. f. irrigated crops. Unsecured sales. Social: Non identified. Environmental: Low fire risk Insect attack. Carbon emissions in harvesting.
Economic: Substitute for agricultural production. Social: Flow-on employment with value adding. Environmental: Expensive set-up cost (`$8,000 per ha) Rapid growth rates.
Estab $6-10,000GM $700-1,000
ha/yr
Farm forestry
(Irrigated)
Economic:
Waterlogging losses in wet years. Social: Non identified.Environmental: Carbon emissions in harvesting.
Economic: Opportunities for value adding, summer feed possibilities. Good markets close-by.Social: Employment in value adding activities Assists in maintaining demographics.Environmental: Almost full use of applied water.
Estab 800-3,000(Crop only$ 250-300)
GM~ $2,450/ha
Lucerne
(Irrigated)
Other costs and
disadvantages
Benefits and advantagesEstablishment
cost and gross
margin (per ha)
Enterprise Option
Enterprise Options
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Economic: None identified.Social: Low labour
requirement.Environmental: Fire
damage/loss. Insect attack. Carbon emissions in harvesting.
Economic: Excellent gross margins.Social: Flow-on employment.
Maintains demographics. Environmental: Periodic labour
inputs.
Estab $3,000GM ~$3-30,000Years 4-51-2 kg/ha =>$2-3,000Years 10=> 10 kg/ha
$2-3,000/kg=$30,000/ha
Forestry / horticultural
seed orchard
(Irrigated)
Economic: Skills need to be acquired or purchased.
Social: Non identified.Environmental: Risk of fire
or insect attack.
Economic: Good GM’s if well managed and marketed.
Social: Flow-on employment Maintains demographics.
Environmental: Improves water balance.
Estab $6-10,000GM $10-20,000
Cut foliage
(predominantly
eucalypts
Irrigated)
Other costs and
disadvantages
Benefits and advantagesEstablishment cost
and gross margin
(per ha)
Enterprise Option
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Other crops considered• Plums - Soil too sodic waterlogging in
winter, irrigation problems unless soil is well managed
• Olives – Could grow, but not likely to be an economic yield
• Grapes - ditto
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Rec 11. Root zone sodicity requires close monitoring some leaching,
balance with watertable.
Rec 12. Irrigation control in line with associated drainage requirements
Rec 13. Deep ripping and mounding and substantial gypsum application 30T/ha
Rec 14. Nitrogen (N) (0-10 cm) depleted: Requirement for N of 20kg/ha.
Similarly, phosphorus requirements from 10-18 kg/ha.
Rec 15. Essential micronutrients depleted
Cu 0.5-1.5 kg/ha, Zn 3.75 kg/ha, Mo 0.025 kg/ha, Mn 0.5-1.5 kg/ha.
Rec 16. Subsurface drainage and serial biological disposal systems required
in the future if salinity / watertable levels increase
Rec 17. Green manure crops for several years to build up soil organic matter
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Soil Mapping & Land Capability
Water & Wastewater (EPA Approvals)
Flora and Fauna Surveys
Environmental Impact Assessments
Cultural Heritage Management Plans
Energy Assessments & Carbon Accounting
(03) 5482 [email protected]