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Abstract
This paper describes a dynamic simulation model that has been developed to provide a
comprehensive assessment of integrated weed management programmes for the control of annual barnyardgrass
(Echinochloa crus-galli complex) in Philippine rice farming systems. The main outputs of the model include
weed seed and plant densities and seasonal and annualised profit over the simulated planning horizon. Model
output emphasises the substantial economic benefits associated with effective long-term weed management
strategies. In addition, a mixture of chemical and non-chemical treatments provides good weed control in rice
crops, and maximises long-term profit for systems where the main weed is annual barnyardgrass. However, the
performance of this strategy is influenced by crop establishment method and weed density level. These results
illustrate the value of the model for guiding the efficient control of annual barnyardgrass in rice crops in the
Philippines.