University of Thessaly
Department of Agriculture, Crop Production &
Agricultural Environment
Laboratory of Agronomy and Applied Crop Physiology
(UTH) Greece
BioKenaF:
A crop growth simulation model for kenaf
September “27-30” 2006
Madrid, Spain
“A Crop Growth Dynamic Simulation Model for Kenaf”
Model structure
 Leaf Photosynthesis
 Canopy Photosynthesis
 Respiration
 Dry Matter distribution
 Water balance routine
Leaf Photosynthesis
The relation between available radiation and
CO2 gross assimilation by a single leaf is
described by an asymptotic exponential relation
FG = AMAX * ( 1 − EXP(− EFF*PAR/AMAX) )
FG: assimilation in kg(CO2)ha-1(leaf)h-1
PAR: photosynthetically active radiation(J m-2s-1)
EFF: is the light use efficiency in
kg ha-1h-1/J m-2s-1
AMAX: maximum rate of CO2 assimilation in
kg(CO2)ha-1(leaf)h-1.
Canopy Photosynthesis
EXTRA
TERRESTIAL
IRRADIANCE
GLOBAL
RADIATION
As. Rate of
sunlit
leaves
PARDIR
VIS
PAR
PARDIF
As. Rate of
shaded
leaves
Integration
Total
Assimilation
Rate
Respiration
Maintenance respiration (MRR): Energy consumed to
meet maintenance requirements.
MRRorg=Rorg*Sorg
Growth respiration (EC): Respiration providing energy for
the conversion of primary photosynthesis into structural plant
materials like, proteins, cellulose, fats, lignin.
DWIorg=DailyGainorg*EC
Dry matter distribution (Daily basis)
Total
Assimilation
Rate
DVS
DWI LEAF - ECleaf
DWI STEM - ECStem
Carbohydrate
As. Rate
(FGASS)
Maintenance
Respiration
Rate of
NET Potential
As.
* FRorg
DWI SHEATH - ECSheath
DWI ROOTS - ECRoot
DWI S. ORGANS -ECSO
BioKenaF: Relation diagram
Light
LAI
SLA
Photosynthesis
LEAVES
Development
rate
Partitioning
coefficients
Development
stage
STEMS
ST. ORGANS
Assimilate
pool
Maintenance
respiration
BIOMASS
Growth
Temp
PETIOLES
CONV.
EFF.
ROOTS
BioKenaF: Relation Diagram
Application
HARDWARE
• Processor:
AMD ATHLON XP 2800+
• Motherboard:
Gigabyte 7N400-Pro
• RAM:
1 GB 400 Mhz
• Hard disk:
W.Digital 160 GB
• Graphics:
GA 6600 GT 128 MB Ram
SOFTWARE
SIMULATION TIME
• Microsoft Visual Basic 6
4 sec
• Microsoft Excel 2000
13 sec including exportation to MS Excel
• Helexis Icon Catcher v3.0
• Microsoft Paint for windows XP
BioKenaF application
Interface
Input Form
BioKenaF application
Soil Type
Input Form
BioKenaF application
Irrigation
Data
Manager
BioKenaF application
Editor of
Meteorological
Data Files
Results
total
stem
leaves
petioles
Palamas- Karditsa (Greece) Year 2003, 100% Irrigation
Results
25000
Kgr / ha
20000
total
15000
stem
10000
5000
leaves
petioles
0
150
200
250
J. Day
300
350
Palamas- Karditsa (Greece) Year 2003, 50% Irrigation
Results
25000
Kgr / ha
20000
total
15000
stem
10000
5000
leaves
petioles
0
150
200
250
300
350
J. Day
Palamas- Karditsa (Greece) Year 2003, 25% Irrigation
Results
25000
Sowing date 19/6/2003
Sowing date 19/5/2003
25000
20000
20000
15000
Kgr / ha
Kgr / ha
15000
10000
5000
5000
0
150
10000
200
250
J. Day
300
350
0
150
200
250
J. Day
Italy Bolognia Year 2003, potential productivity
300
350
Results
2004 S2
25000
25000
20000
20000
Kgr / ha
Kgr / ha
2004 S1
15000
10000
15000
10000
5000
5000
0
0
150
200
250
300
J. Day
350
400
150
200
250
300
J. Day
Italy Bolognia Year 2004, potential productivity
350
400
Results
25000,00
Kgr / ha
20000,00
15000,00
10000,00
total
stem
5000,00
leaves
petioles
0,00
150
200
250
300
350
J. Day
France- Nicae Year 2005, potential productivity
Results
Greece Year 2003
Results
Greece Year 2004
Results
Greece Year 2005
Results
Bolognia Year 2003
Results
Bolognia Year 2003
Results
France Year 2004
Results
Summary
Missing Data
Wheather
Location
Year
TMAX
TMIN
Radiation
Precipitation
Wind
RH
Day of Emer.
Harvests
Irrigation
Soil Type
G. Water
Portugal
2003
X
X
X
X
X
X
X
X
X
X
X
2004
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
2005
Catania
2003
X
X
2004
Problem
2005
Spain
2003
X
X
X
X
X
X
2004
X
X
X
X
X
X
2005
X
X
X
X
X
X
Greece
2003
?
X
X
X
X
CETA
2004
?
X
X
X
X
X
X
X
France
X
2005
X
X
?
X
X
X
X
2003
X
X
X
X
X
X
X
X
X
X
2004
X
X
X
X
X
X
X
X
X
X
Thank you for your attention !