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Modeling biomass, nitrogen and water dynamics in rice-wheat rotations

Published on Sep 1, 2010in Agricultural Systems4.131
· DOI :10.1016/j.agsy.2010.04.001
Qi Jing3
Estimated H-index: 3
(NAU: Nanjing Agricultural University),
Herman van Keulen20
Estimated H-index: 20
(WUR: Wageningen University and Research Centre),
Huib Hengsdijk24
Estimated H-index: 24
(WUR: Wageningen University and Research Centre)
Sources
Abstract
Rice-wheat cropping systems occupy between 24 and 26Â Mha in Asia. A main feature of RW rotations is the alternation of aerobic and anaerobic soil conditions. This alternation of flooded and non-flooded soil conditions is conducive to N emissions, especially with the current high N rates in RW systems. To design alternative management systems, better understanding of the processes underlying emissions is required. For that purpose, the RIce WhEat Rotation model (RIWER) was developed, on the basis of existing crop, water and soil organic matter models, describing the relevant soil processes under both anaerobic and aerobic conditions. RIWER is evaluated using data from RW experiments in China. Assessment of model performance, on the basis of graphical comparison and goodness-of-fit parameters, showed that RIWER performs well in simulating total aboveground biomass, N uptake of cops and soil inorganic N content. The RIWER modeling framework needs further testing, but offers a promising operational tool to support the design of sustainable RW systems, combining environmentally-friendly production methods and high yields.
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