A field study on the impactof the nitrification inhibitorDMPP on N2O emissionsfrom a pasture in southwestern VictoriaHelen...
Nitrification and inhibitorsUrea                                   N2O  hydrolysis                                        ...
Experimental methodologyTreatments    • Control    • Urea    • Urea with Entec® = Urea + DMPP ( Dimethyl pyrazole phosphat...
Experimental methodology• Location : Murroon, south west Victoria• Average annual rainfall : 660 mm• Pasture : 2 year old ...
Experimental methodology : Data Collectiono Gas – N2O, CO2, CH4    • 3 samples (0, 30, 60 mins)/chamber    • weekly and ev...
Results: Daily N2O emissions (April-Oct)                              45                                   control       f...
35                                                                control   fertiliser application at 40 kg N/ha          ...
35                                                    control   fertiliser application at 40 kg N/ha                      ...
Results: Cumulative Net-N2O emissions                                       450                                       400 ...
Results : soil nitrate levels                18                16                14                12                     ...
18                                     16                                     14                                     12   ...
18                                           16                                           14                              ...
Results : Dry Matter (DM) production (kg/ha)                                                                              ...
Results : Dry Matter (DM) production (kg/ha)                                                                              ...
Conclusions : DMPP impact on N2O emissions from a               pastureCompared to urea, DMPP :• delayed formation of NO3-...
AcknowledgementsDebra Turner, Yuntong Liu, Xing Chen, RobertEdis, David Hopkins, Peter and Mary-JaneGanon, Chen Li, Marion...
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A field study on the impact of the nitrification inhibitor DMPP on nitrous oxide emissions from pasture - Helen Suter

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A field study on the impact of the nitrification inhibitor DMPP on nitrous oxide emissions from pasture - Helen Suter

  1. 1. A field study on the impactof the nitrification inhibitorDMPP on N2O emissionsfrom a pasture in southwestern VictoriaHelen Suter, Humaira Sultanaand Deli Chen(The University of Melbourne)Rohan Davies and Matthew Mahoney(Incitec Pivot)
  2. 2. Nitrification and inhibitorsUrea N2O hydrolysis denitrification nitrificationNH4 + NO3- N2 (eg. Nitrosomonas) N2ONitrification inhibitor eg. Dimethylpyrazole phosphate (DMPP)
  3. 3. Experimental methodologyTreatments • Control • Urea • Urea with Entec® = Urea + DMPP ( Dimethyl pyrazole phosphate) 5 replicates/treatment
  4. 4. Experimental methodology• Location : Murroon, south west Victoria• Average annual rainfall : 660 mm• Pasture : 2 year old ryegrass seed pasture• Soil : duplex, silty loam topsoil, pHW 5.5• Grazing : sheep grazing (prior to trial)• Plot size : 2 m x 1 m• Application rate: 40 kg N/ha Source: Google maps• Start date: 12 April 2010• End date: 23 December 2010• Fertilisation events: 7• Gas collection: manual chambers (23 x 20 cm)
  5. 5. Experimental methodology : Data Collectiono Gas – N2O, CO2, CH4 • 3 samples (0, 30, 60 mins)/chamber • weekly and event driven • analysed in labo Soil • fortnightly • NH4+ and NO3-o Biomass production and N content • monthlyo Additional data • climate data • soil moisture and temperature
  6. 6. Results: Daily N2O emissions (April-Oct) 45 control fertiliser application at 40 kg N/ha 40 urea DMPP 35Calculated daily N2O (g/ha) 30 25 20 site waterlogged, no sampling 15 10 5 0
  7. 7. 35 control fertiliser application at 40 kg N/ha 30 urea DMPP 25 Calculated daily N 2O (g/ha) 20 site waterlogged, no samplingResults: 15Daily N2O 10emissions andrainfall (April-Oct) 5 0 40 35 30 Rainfall (mm) 25 20 15 10 5 0(Total rainfall 522 mm)
  8. 8. 35 control fertiliser application at 40 kg N/ha 30 urea DMPP 25 Calculated daily N 2O (g/ha) 20 site waterlogged, no samplingResults: 15Daily N2O 10emissions anddaily mean 5maximum 0temperature(April-Oct) 30 25 Temperature (oC) 20 15 10 5 0
  9. 9. Results: Cumulative Net-N2O emissions 450 400 350 Urea fertiliser application at 40 kg N/haCalculated cumulative Net-N2O (g/ha) 300 DMPP 250 200 73% reduction 150 100 50 0
  10. 10. Results : soil nitrate levels 18 16 14 12 ControlNitrate -N (kg/ha) DMPP 10 Urea 8 6 4 2 0
  11. 11. 18 16 14 12 Control Nitrate -N (kg/ha) DMPP 10 Urea 8Results : soil 6nitrate levels and 4potential for 2leaching loss 0 40 35 30 Rainfall (mm) 25 20 15 10 5 0
  12. 12. 18 16 14 12 Control Nitrate -N (kg/ha) DMPP 10 Urea 8 Results : soil 6 nitrate levels and 4 potential for 2 leaching loss 0 40Potential for leaching 35losses reduced with DMPP 30 Rainfall (mm) 25 20 15 10 5 0
  13. 13. Results : Dry Matter (DM) production (kg/ha) Cumulative Treatment 10-May 7-Jun* 19-Jul 3-Sep 27-Sep 21-Oct (240 kg N applied) Control 428 ± 68 106 ± 24 232 ± 45 259 ± 35 256 ± 29 454 ± 46 1736 Urea 699 ± 70 159 ± 9 569 ± 11 876 ± 82 818 ± 33 1027 ± 41 4149Urea + DMPP 748 ± 97 207 ± 36 618 ± 71 949 ± 74 754 ± 60 1030 ± 78 4307% increase innet DM with 18 89 14 12 -11 1 6 DMPP (Value is average of 5 reps ± standard error) * 7 June sampling comes 2 months after fertilisation on 12 April
  14. 14. Results : Dry Matter (DM) production (kg/ha) Cumulative Treatment 10-May 7-Jun* 19-Jul 3-Sep 27-Sep 21-Oct (240 kg N applied) Control 428 ± 68 106 ± 24 232 ± 45 259 ± 35 256 ± 29 454 ± 46 1736 Urea 699 ± 70 159 ± 9 569 ± 11 876 ± 82 818 ± 33 1027 ± 41 4149Urea + DMPP 748 ± 97 207 ± 36 618 ± 71 949 ± 74 754 ± 60 1030 ± 78 4307% increase innet DM with 18 89 14 12 -11 1 6 DMPP * 7 June sampling comes 2 months after fertilisation on 12 April
  15. 15. Conclusions : DMPP impact on N2O emissions from a pastureCompared to urea, DMPP :• delayed formation of NO3--N at some times of the year with greatest impact during high rainfall periods – April, June, August• reduced Net-N2O emissions: – over a 6 month period by 73% – at particular times of the year (high temp/rainfall) but not always• increased the longevity of supply of N for plant growth for 60 days leading to an 87% increase in DM production (June sampling) compared to urea
  16. 16. AcknowledgementsDebra Turner, Yuntong Liu, Xing Chen, RobertEdis, David Hopkins, Peter and Mary-JaneGanon, Chen Li, Marion Benfell, Jagrati Singh
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