E.M. Shibu: “Modeling long-term dynamics of carbon and nitrogen in intensive rice-based cropping systems in the Indo-Gangetic Plains (India)”

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11 Jun 2007 13:30
Unit: Wageningen University
Location: Aula, building 362, Gen. Foulkesweg 1, Wageningen
Organisation: Wageningen University
Co Promotor: Prof.dr.ir. H. van Keulen (Promotor)Dr.ir. P.A. Leffelaar, Dr. P.K. Aggarwal (Indian Agricultural Research Institute, New Delhi, India)

 The main objective of the PhD study Modeling long-term dynamics of carbon and nitrogen in intensive rice-based cropping systems in the Indo-Gangetic Plains (India) was assessing the impact of intensive cropping on the sustainability of rice-based systems in the Indo-Gangetic Plains (IGP), producing about 40% of the total national food grain supply in India, with special emphasis on soil carbon and nitrogen. Recent reports show yield declines in some parts of the IGP. One of the suggested reasons is a decline in soil organic matter (SOM) quality and quantity. A model, developed in this study, describing the relation between SOM and crop yield was calibrated and validated with long-term experimental data collected from different regions in the IGP. Model results show a yield decline in only two sites out of nine studied, and an increase in SOM is not always associated with higher yields. Thus, the observed yield decline in intensive systems can only partly be explained by SOM dynamics.
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