Download CROP GROWTH MODEL WOFOST lecture

CROP GROWTH MODEL WOFOST
lecture
AGRIDEMA – Vienna
2005
Miroslav Trnka
Contributions from: Martin Dubrovský, Joseph
Eitzinger, Jan Haberle, Zdenek Žalud
History
First version Wolf et al. 1986
Originally intended for use at the Centre for World Food
Studies
Used for assessment of potential yield of annual crops in
tropical countries
Later versions used for
yield risk assessment & interannual yield variability
effect of agriculture management strategies
effect of climate change
quantitative land evaluation
as a part of other models (e.g. Detail hydrological model SWAP)
Present status:
Model philosophy:
1) Process oriented model
2) Three levels of production
1) Potential
2) Water-limited
3) Nutrient-limited
3) Limited input datasets
4) „Friendly“ for use in the spatialized assessments
Model structure:
Timer
Weather
Crop growth
Water
balance
Model structure:
Model evaluation:
Under different soil conditons
At multiple sites for two crops
On the regional and country level
Various soil conditons
TESTED MODELS
EXPERIMENTAL DATA
CERES-Barley (USA, 1991/1999)
Site: Marchfeld seasons: 2000&2001
WOFOST (The Netherlands, 1988/2001)
SWAP (The Netherlands, 1997/2001)
COMPARED PARAMETERS
Reproduction of the soil water dynamics
in the whole profile
Reproduction of the soil water dynamics
in the individual layers
Grain yields
Deviations of the measured
simulated evapotranspiration
and
Soil
types:
Chernozem,
chernozem, fluvisoil
Sandy
Various soils – water content
Various soils –root growth
Various soils - grain yield
Multiple locations
EXPERIMENTAL DATA
TESTED MODEL
WOFOST (The Netherlands, 1988/2001)
Sites: 10 experimental stations
across the CR
Modified by Dubrovský et al. (2002)
Build into the PERUN decision support
systém (Dubrovský et al. version 2005).
COMPARED PARAMETERS
Onset of the key phenological stages
Reproduction of the interannual yield
variability
Deviations of the
simulated grain yields
measured
and
Differences between individual cultivars
Sensitivity analysis
Soil types: Chernozem, Cambisoils
(various subtypes)
Multiple locations:
Multiple locations barley anthesis:
Multiple locations barley maturity:
Multiple locations barley yield:
Multiple locations wheat anthesis:
Multiple locations wheat maturity:
Multiple locations wheat yield:
Multiple locations ANTHESIS:
Spring barley
Winter wheat
Multiple locations MATURITY:
Spring barley
Winter wheat
Multiple locations GRAIN YIELD:
Spring barley
Winter wheat
Spatial assessment – regional level:
Spatial assessment – regional level :
Spatial assessment – regional level :
Mean number of
Mean spring barley
drought stress
yield 1965-1994
days 1965-1994
Spatial assessment – National level:
Weather stations
Soil types
Spatial assessment – National level:
Spatial assessment EU scale:
confused?
WOFOST based applications:
WOFOST – stand alone model
seasonal analysis (1 location, 1 crop)
multiple analysis at one location
PERUN – decision support system
the same capabilities as WOFOST
+
multiple season, multiple location
analysis
spatial analysis
sensitivity analysis
yield forecasting
climate change impact analysis
CGMS – MARS project
multiple indicator – paneuropean monitoring scheme
THANK YOU
and see you in the afternoon