A model of the cost of delay in spraying weeds in cereals

application date australia australia meridional australie barley cebada cereales cereals chemical control crop yield date de traitement economia economics economie fecha de tratamiento herbicidas herbicide herbicides lutte chimique macollamiento malezas mauvaise herbe methode methods modele modelos models orge rendement des cultures rendimiento de cultivos south australia spraying tallage tillering treatment date trigo weeds wheats