chapter 1 Current.Status.and.Future.Needs.in.Modeling.Plant.Nitrogen / chapter 2 Modeling.Nitrogen.Fixation.and.Its.Relationship.to.Nitrogen. Uptake.in.the.CROPGRO.Model -- chapter 3 Modeling.Nitrate.Uptake.and.Nitrogen.Dynamics.in.Winter. Oilseed.Rape.(Brassica napus.L.) -- chapter 4 Control.of.Plant.Nitrogen.Uptake.in.Native.Ecosystems.by. Rhizospheric.Processes -- chapter 5 Dissolved.Organic.Nitrogen.and.Mechanisms.of.Its.Uptake.by. Plants.in.Agricultural.Systems -- chapter 6 Water.and.Nitrogen.Uptake.and.Responses.in.Models.of.Wheat,. Potatoes,.and.Maize -- chapter 7 Modeling.Grain.Protein.Formation.in.Relation.to.Nitrogen. Uptake.and.Remobilization.in.Rice -- chapter 8 Modeling Water and Nitrogen Uptake Using a Single-Root Concept: Exemplified by the Use in the Daisy Model -- chapter 9 Modeling.Plant.Nitrogen.Uptake.Using.Three-Dimensional.and. One-Dimensional.Root.Architecture -- chapter 10 Simulation.of.Nitrogen.Demand.and.Uptake.in.Potato.Using.a. Carbon-Assimilation.Approach -- chapter 11 Roots.below.One-Meter.Depth.Are.Important.for.Uptake.of. Nitrate.by.Annual.Crops -- chapter 12 Nitrogen-Uptake.Effects.on.Nitrogen.Loss.in.Tile.Drainage.as. Estimated.by.RZWQM -- chapter 13 Simulated.Soil.Water.Content.Effect.on.Plant.Nitrogen.Uptake. and.Export.for.Watershed.Management.