Nitrogen Management in a Maize-Groundnut Crop Rotation of Humid Tropics: Effect on N2O Emission
Development of appropriate land management techniques to attain sustainability and increase the N use efficiency of crops in the tropics has been gaining momentum. The nitrous oxides (N2Os) affect global climate change and its contribution from N and C management systems is of great significance. Th...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2001-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1100/tsw.2001.453 |
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| Summary: | Development of appropriate land management
techniques to attain sustainability and increase
the N use efficiency of crops in the tropics has
been gaining momentum. The nitrous oxides
(N2Os) affect global climate change and its contribution
from N and C management systems is
of great significance. Thus, N transformations and
N2O emission during maize-groundnut crop rotation
managed with various N sources were studied.
Accumulation of nitrate (NO3
–) and its disappearance
happened immediately after addition of
various N sources, showing liming effect. The mineral
N retained for 2–4 weeks depending on the
type and amount of N application. The chicken
manure showed rapid nitrification in the first week
after application during the fallow period, leading
to a maximum N2O flux of 9889 μg N2O-N m–2 day–
1. The same plots showed a residual effect by
emitting the highest N2O (4053 μg N2O-N m–2 day–
1) during maize cultivation supplied with a halfrate
of N fertilizer. Application of N fertilizer only
or in combination with crop residues exhibited
either lowered fluxes or caused a sink during the
groundnut and fallow periods due to small availability
of substrates and/or low water-filled pore
space (<40%). The annual N2O emission ranged
from 1.41 to 3.94 kg N2O-N ha–1; the highest was estimated from the chicken manure plus crop residues
and half-rate of inorganic N-amended plots.
Results indicates a greater influence of chicken
manure on the N transformations and thereby N2O
emission. |
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| ISSN: | 1537-744X |