Precision management of agricultural systems,aiming at optimizing profitability,productivity and sustainability,comprises a set of technologies including sensors,information systems,and informed management,etc.Expert systems are expected to aid farmers in plant management or environment control,but they are mostly based on the offline and static information,deviated from the actual situation.Parallel management,achieved by virtual/artificial agricultural system,computational experiment and parallel execution,provides a generic framework of solution for online decision support.In this paper,we present the three steps toward the parallel management of plant:growth description (the crop model),prediction,and prescription.This approach can update the expert system by adding leing ability and the adaption of knowledge database according to the descriptive and predictive model.The possibilities of passing the knowledge of experienced farmers to younger generation,as well as the application to the parallel breeding of plant through such system,are discussed.