Interaction between soil and fertiliser nitrogen drives plant nitrogen uptake and nitrous oxide (N2O) emissions in tropical sugarcane systems
Aims High nitrogen (N) fertiliser inputs in intensive sugarcane systems drive productivity but also significant emissions of nitrous oxide (N 2 O), a potent greenhouse gas. Fertiliser and soil N availability for both plant N uptake and N 2 O emissions across different N rates remain unknown, hinderi...
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Published in: | Plant and soil Vol. 477; no. 1-2; pp. 647 - 663 |
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Main Authors: | , , , , , , |
Format: | Journal Article |
Language: | English |
Published: |
Cham
Springer International Publishing
01-08-2022
Springer Springer Nature B.V |
Subjects: | |
Online Access: | Get full text |
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Summary: | Aims
High nitrogen (N) fertiliser inputs in intensive sugarcane systems drive productivity but also significant emissions of nitrous oxide (N
2
O), a potent greenhouse gas. Fertiliser and soil N availability for both plant N uptake and N
2
O emissions across different N rates remain unknown, hindering efficient N management. This study investigated the contribution of fertiliser and soil N and their interaction to plant N uptake and N
2
O emissions in two intensively managed tropical sugarcane systems.
Methods
High temporal resolution N
2
O measurements were combined with
15
N recoveries across four N fertiliser rates, (100, 150, 200 and 250 kg N ha
− 1
) in soil, plant and N
2
O emissions.
Results
Cumulative N
2
O emissions ranged from 0.3 to 4.1 kg N ha
− 1
, corresponding to emission factors ranging from 0.7 to 2.4%. Native soil N accounted for > 60% of cumulative N
2
O emissions and total plant N uptake. Fertiliser N addition increased N
2
O emissions from native soil N compared to the unfertilised control, highlighting the interaction between fertiliser and soil N, which determined the overall magnitude but also the response of total N
2
O emissions to N rates dependent on the site conditions. Overall fertiliser
15
N loss responded exponentially to N rates with 50% of applied N fertiliser permanently lost even at the recommended N rate.
Conclusions
The interaction between fertiliser and soil N and its contribution to N uptake and N
2
O emissions demonstrate the importance of integrating soil fertility management with N fertiliser rate recommendations for sugarcane systems to maintain crop productivity and reduce environmental impacts. |
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ISSN: | 0032-079X 1573-5036 |
DOI: | 10.1007/s11104-022-05458-6 |