March 16 2017 A Fredeen P Havard Y Papadopoulos T Bouman S Kulshreshtha E Yiridoe C Madramootoo Dalhousie University Truro NS AAFC Troro NS University of Cape Breton Sydney ID: 633060
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Sub- irrigation of perennial forage Based Dairy systemMarch 16, 2017
A. Fredeen, P. Havard, Y. Papadopoulos, T. Bouman, S. Kulshreshtha, E. Yiridoe, C. Madramootoo Dalhousie University, Truro, NS; AAFC, Troro, NS;University of Cape Breton, Sydney; University of Saskatchewan, SK; Macdonald College, McGill St. Anne de Bellevue, QU.,
1Slide2
Sub- recycling irrigation/ drainage under perennial forage - Harvested by mob- grazing (5x/season).
- GHG flux measured on the field (manure only). - Plant and animal productivityExperiment 2012- 20152Figure 1. Field layoutd-2 sid-2 d-1 Sid-1none- 2 none-1Reservoir
PumpSlide3
Natural
b
Natural
a
Non-Irrigated 4
b
Non-Irrigated
2 a
Irrigated 3
b
Irrigated 1
a
Permantent Electric Fencing
Temporary Fencing
Water line
Water bin
Gate
Instruments/fencing
3Slide4
Table 1.
effect of irrigation and day; Probability
Source of variation
Milk yield
Kg/ d
ECM
Kg/ d
N
2
O
g/ d
CH
4
g/ d
CO
2
g/ d
Irrigation
0.30
0.94
0.06
0.81
0.25
Day
0.001
0.001
0.001
0.001
Day*Irrigation
0.001
0.999
0.94
0.15
0.04
4
ResultsSlide5
5
Figure 3. Treatment effect on N2O emissionSlide6
15.5t CH
41tN2O
Up to 80t C
1
73t milk
GHG Balance, CO
2
equiv
/ 4
mo
& milk yield on 41ha field
4.1 ha
6
1
Ghimiro, 2014Slide7
Gaps
Perennial forage can completely offset GHG production in dairy ystems1 but the effects of irrigation on SOC storage are unknown. Heightened irrigation/ severity of flooding neededRate of SOC accumulation ?Extent of fertigation?Socio-economic impact? 1Soussanna et al.1Soussana7Slide8
Objective AGGPII
To evaluate the profitability of SID & effects on GHG offset from perennial forage.… effects on: Soil C accumulationAgronomic productivity, Socio-economics8Slide9
3 trt
x 2 rep: - Continual SID - Drainage - Neither Repeated variables: - Forage yield - Forage quality - Potential milk yield SOC Method9Slide10
SOC Measurement
Rhizosphere level and surface3x/ y10