dairy feedbase stategies to offset rising pumping costs pat daley, mark callow
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Dairy feedbase stategies to offset rising pumping costs
Pat Daley, Mark Callow
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Presentation Northern Australian Dairy Industry
Objective of Study
Methodology
Results
Summary
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Northern Australian Dairy Industry
Milk production occurs all year round
Subtropical environment; high evapotranspiration, variable rainfall
>60% of farms irrigate pastures and crops
Irrigated ryegrass pasture important source of feed during winter
Milk price has remained stable but energy costs are rising
Installation of new irrigation systems
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Objective of study
1. Analyse energy consumption used for irrigation on dairy and lucerne farms
2. Evaluate the effect of increasing ryegrass production and water use efficiency on pumping costs
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Methodology Compare calculated pumping costs within irrigation systems;
Low pressure (<35 psi; centre pivots and lateral moves)
Medium pressure (60 psi; solid set, side roll, fixed boom soft hose)
High pressure (>95 psi; big gun soft and hard hose)
WUE increased linearly by 0.25 t DM/ML for every 2 t DM/ha increase
Pumping costs ($/ML) were calculated assuming;
Power cost $/Kwh = $0.20
Energy consumption to pump 1 ML to 1 m of head (Kwh/ML/m) = 6.7
Kwh/ML/psi = 6.7/1.42 = 4.71
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6Acknowledgement to Southern Cross Pumps for this performance chart
5.8L/S @114Mh
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Results
KWh/ML/Mor
Units of energy/ Water volume/PressureThe average for the state is 6.7 KWh/ML/M
@ $0.20 per KWh this is $1.34/ML/MThe top 10% for the state is 4.5 KWh/ML/M
@ $0.20 per KWh this is $0.90/ML/M
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Results
1. Analyse energy consumption used for irrigation on dairy and lucerne farms
0
20
40
60
80
100
120
140
Pu
mp
ing
co
st
($/M
L @
$0
.20
/kw
h)
Top 10%
Average
Lowest 10%
Low pressure (<35 psi)
Medium pressure (60 psi)
High pressure (>95 psi)
Centre pivot & lateral
Solid set, side roll & boom soft
hose
Big gun soft & hard hose
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Results
2. Evaluate the effect of increasing ryegrass production and water use efficiency on pumping costs
0
20
40
60
80
100
120
140
4 6 8 10 12 14 16
Ryegrass yield (t DM/ha)
Pu
mp
ing
co
sts
($/t
DM
) Low
High
Medium
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Summary
Energy costs can be reduced by,Improved irrigation hardware design and
installation
Improved agronomic management
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Thank YouKMSI is the Knowledge Management System for Irrigation, developed by the National Centre for Engineering in Agriculture with funds provided by the Queensland Government
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Pumping Energy App 6.7 4.5
•Centre Pivot 95% $46.90 $27.00•Lateral Move 90% $67.00 $36.00 •Solid Set 85% $69.00 $36.00•Side Roll 75% $74.15 $40.50•Hand shift 65% $78.40 $49.50 •Boom Soft hose 75% $78.56 $40.50•Big Gun soft hose 60% $98.50 $58.50•Big Gun Hard hose 55% $116.58 $81.00•Flood (Control) 50% $26.80 $18.00•Micro spray 75% $40.20 $27.00
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Fuel/Energy
• Electricity 3.6 MJ = 1 Kwh 85 to 95%eff• Diesel 40 MJ = 11.1 Kwh 30 to 33%eff• Bio Diesel 35.1 MJ = 9.75 Kwh 30 to 33%eff• Ngas 39 MJ = 10.8 Kwh 40 to 48%eff• Ethanol 23.5MJ = 6.52Kwh 25 to 35%eff
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