Validasi
model SUCSOY.INS dilakukan dengan cara membandingkan hasil simulasi
hasil Soybean (WSO) dengan model SUCSOY.CSM sebagai acuan, pada time step 2
hari memakai metode Integrasi RKSFX.
Input data iklim (Suhu maksimum, minimum dan Radiasi surya) memakai data Keulen, et. al.(1982), sementara data partisi tanaman kedelai memakai data Penning
de Vries and van Laar (1982).
Hasil simulasi
potensi hasil Soybean (WSO) pada tingkat Latitude (LAT) = -15,
menunjukkan bahwa pada umur panen 420 hari diperoleh hasil
masing-masing sebesar 2.150,14 kg/ha (SUCSOY.INS), dan 2.150,20
(SUCSOY.CSM); dengan Koefisien determinasi (R2) = 1, Root Mean Square Error (RMSE) = 0,02.
Kesimpulannya
SUCSOY.INS mempunyai prospek dikembangkan untuk simulasi potensi hasil
kedelai beberapa varietas unggul kedelai di Indonesia; dengan mengganti
input data partisi dan parameter tanaman Soybean dengan partisi dan parameter tanaman varietas unggul Kedelai di Indonesia.
I K Tastra
iktastra@yahoo.com
===================================
Lampiran 1. Keterangan peubah dan parameter model
simulasi SUCSOY.INS (Penning
de Vries and van Laar (1982)).
Name
Description
Unit
AMAX
CO2 assimilation rate of leaf at light
saturation
kg(CO2)/ha(Leaf)/h
AVRAD
Actual daily radiation (400-700 nm)
J/m2/d
AVRADT
Table measured global radiation (cal/Cm2/d)
vs day number
-
CVF
Conversion efficiency for growth of plant dry matter
(DM)
kg(DM)/kg (CH2O)
CVFSO
Conversion efficiency for formation of storage organs
kg (DM)/kg (CH2O)
DAY
Number of day in the year from 1st January
day
DEC
Declination of sun with respect to the equator
Degree
DGAC
Daily gross CO2 assimilation -standard
clear sky-
kg (CO2)/ha/d
DGAO
Daily gross CO2 assimilation -standard
overcast sky-
kg (CO2)/ha/d
DL
Astronomical day length
h
DLE
Effective day length
h
DLP
Photoperiodic day length
h
DLV
Death rate of the leaves
kg/ ha/d
DRC
Photo synthetically active radiation -standard clear
sky-
J/m2/d
DRO
Photo synthetically active radiation -standard overcast
sky-
J/m2/d
DTGA
Actual daily gross co2 assimilation
kg (CO2)/ha/d
DVRDTB
Relation between rate of development and day length
-
DVRR
Rate of development in reproductive phase in relation
to temperature
1/d
DVRRTB
Table of DVRR as function of temperature
-
DVRTTB
Relation between rate of development and temperature
-
DVRV
Rate of development in vegetative phase in relation to
temperature
And day length
1/d
DVS
Development stage of the crop
Fraction
EFF
Efficiency of use of absorbed visible radiation for CO2
assimilation at low light level
kg(CO2)/J/ha/h m2 s
EFFE
EFF based on incident radiation
kg(CO2)/J/ha/h m2 s
FLV
Fraction of leaves in shoot biomass
-
FLVTB
Table FLV vs development stage
-
FOV
Fraction of time that sky is overcast
-
FSH
Fraction of shoot in total plant biomass
-
FSHTB
Table FSH vs development stage
-
FSO
Fraction of storage organs in shoot biomass
-
FSOTB
Table FSO vs development stage
-
FST
Fraction of stems in shoot biomass
-
FSTTB
Table FST vs development stage
-
GLV
Growth rate of the leaves
kg (DM)/ha/d
GPHOT
Daily gross CO2 assimilation
kg (CH2O)/ha/d
GRT
Growth rate of the roots
kg (DM)/ha/d
GSH
Growth rate of the shoot
kg (DM)/ha/d
GSO
Growth rate of the storage biomass
kg (DM)/ha/d
GST
Growth rate of the stems
kg (DM)/ha/d
GTW
Growth rate of total plant biomass
kg (DM)/ha/d
LAI
Leaf area index
m2/m2
LAT
Latitude
Degree
MAINT
Maintenance respiration of the vegetation
kg (CH2O)/ha/d
MAINTS
Maintenance respiration at standard temperature (25 C)
kg (CH2O)/ha/d
NWRT
Negative weight of roots (output variable)
kg (DM)/ha
PI
Circumference of a circle, divided by its diameter
-
O10
Increase in rate of maintenance processes per 10 degree
C
-
RDN
Average level incoming photosynthetic active radiation
J/m2/S
RDR
Relative death rate of the leaves
1/d
RDRTB
Table RDR vs development stage
-
REFLC
Reflection coefficient of the canopy
Fraction
SLFA
Specific leaf area
ha(Leaf)/kg(Leaf)
TADRW
Total above-ground biomass
kg /ha
TEFF
Effect of temperature on rate of maintenance
respiration
-
TIME
Simulated time
day
TMAXT
Table maximum temperature vs day number
-
TMINT
Table minimum temperature vs day number
-
TMPA
Average air temperature
Degree C
WLV
Weight of the green leaves
kg /ha
WLVD
Weight of the dead leaves
kg /ha
WLVI
Initial weight of the leaves
kg /ha
WLVT
Weight of the green plus dead leaves (output variable)
kg /ha
WRT
Weight of the dead leaves
kg /ha
WRTI
Initial weight of the roots
kg /ha
WSO
Weight of the storage organs
kg /ha
WST
Weight of the stems
kg /ha
WVEG
Weight of the vegetative parts (output variable)
kg /ha