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Phase 5 Nutrient Land Calibration. Jing Wu 04/04/2006 Modeling Subcommittee. Calibration Targets – 8 for each land use. NH 3 NO 3 Labile ORGN Refractory ORGN. }. SURFACE. INTERFLOW. (“slow” surface flow). lower soil layer. NH 3 NO 3 Labile ORGN Refractory ORGN. Groundwater.

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phase 5 nutrient land calibration

Phase 5 Nutrient Land Calibration

Jing Wu

04/04/2006

Modeling Subcommittee

calibration targets 8 for each land use
Calibration Targets – 8 for each land use

NH3

NO3

Labile ORGN

Refractory ORGN

}

SURFACE

INTERFLOW

(“slow” surface flow)

lower soil layer

NH3

NO3

Labile ORGN

Refractory ORGN

Groundwater

slide3

Calibration Strategy

  • Decision rules developed to relate each target to relevant parameters

- Parameters in the first two layers affected

surface loading

- Parameters in the 3rd and 4th layer affected

below surface loading

slide4

Status at last meeting:

  • Only two land uses tested
  • Most EoF targets not reached
  • Suggested changes on application data, EoF targets, and different decision rules
slide5

Changes made since last meeting:

  • Application data (timing, plant uptake curve, etc..)
  • EoF targets

TN remains same, changes in break-up between different species

Surface: NH3/NO3 = 1:10

Subsurface: NH3/NO3 = 1:5

  • Calibration strategy – decision rules different for different land uses

- forest

- crop, hay

forest calibration
Forest Calibration
  • Targets changed based on literature values and P4.3 results

TN = 1.7(lbs/acre/yr), same targets everywhere

  • Same decision rules as applied before
crop calibration
Crop calibration

Three goals need to be accomplished:

1.EoF loads within reasonable range of targets

2. Plant N uptake simulated correctly, within

reasonable range of observed data (critical,

account for most of N loss)

3. Stable N storage over time

calibration strategy
Calibration Strategy
  • Optimize parameters as did for Forest

- to reach EoF targets

  • Optimize initial storages for labile and refractory organic nitrogen

- to eliminate huge spike at the first year due to

high initial storage

- to stabilize storage over time

slide10

Related initial storage to organic N

export at the first three years

calibration strategy cont
Calibration Strategy (cont.)
  • Improve simulation on crop uptake

- Change the timing of application data

- Return 60% plant N to refractory organic N

. act as a way to harvest plant

(will increase refractory organic N export,

though)

slide12

Old data

Application timing

closer to uptake

After fixed storage

and plant N return

comparison of regular crop and nutrient management crop
Comparison of regular crop and nutrient management crop
  • Test model’s capacity of simulating management actions
  • Use the calibrated land parameters to run nutrient management land
  • TN and plant uptake compared
comparison of hom and nho
Comparison of hom and nho

On average,

32% lower

On average,

11% lower

preliminary observations
Preliminary observations:
  • New results promising
  • Majority of EoF loadings within reasonable range of targets
  • Plant N uptake within the range of observed data
  • Further refinement needed