Research School for Socio-Economic and
Natural Sciences of the Environment
Research School for Socio-Economic and
Natural Sciences of the Environment
Agenda

Nurul Khairudin

Date: 15 March 2017
Time: 16:00 - 17:30
Location: Aula, building 362, Gen. Foulkesweg 1, Wageningen

Dissertation title: 

Modelling of ammonia volatilisation in fertilised and flooded rice systems

Group: Wageningen University, Biorefinary and Process Dynamics
Promotor: prof. dr ir PC Struik
Co-promotors: dr ir KJ Keesman and Prof. dr MP Zakaria

Abstract:

Ammonia volatilisation is a main pathway of nitrogen losses in flooded rice systems, and has negative effects on production cost and environment. Models for estimating ammonia volatilisation were developed for scientific insights, and are valuable for making management recommendations. However, the interactive processes in these systems resulted in ammonia volatilisation models of different complexities. The overall aim of this thesis is to determine the appropriate concept and structure of a model for estimating NH3 volatilisation in fertilised and flooded rice fields, given limited availability of observational data sets. Concepts in existing models were evaluated, tested by simulations, and re-structured, in order to propose an alternative model of complexity appropriate for small observational data sets. The proposed model was evaluated using a set-membership approach. The systematic approach in this study revealed limitations and advantages of different model structures for the estimation of ammonia volatilisation in fertilised and flooded rice systems.