*RICE CULTIVAR COEFFICIENTS: RICER048 MODEL
!
! COEFF DEFINITIONS
! ======== ===========
! VAR# Identification code or number for a specific cultivar.
! VAR-NAME Name of cultivar.
! EXPNO Number of experiments used to estimate cultivar parameters
! ECO# Ecotype code for this cultivar points to the Ecotype in the ECO
! file (currently not used).
! P1 Time period (expressed as growing degree days [GDD] in oC-d above a
! base temperature of 9oC) from seedling emergence during which the
! rice plant is not responsive to changes in photoperiod. This period
! is also referred to as the basic vegetative phase of the plant.
! Range: 150-800 oC-d.
! Calibration: flexible, compare with observed panicle initiation
! and flowering dates.
! P2O Critical photoperiod or the longest day length (in hours) at
! which the development occurs at a maximum rate. At values higher
! than P2O developmental rate is slowed, hence there is delay due
! to longer day lengths.
! Range 11-13 h. Default 12 h.
! Calibration: Do not go below 11 unless data are available.
! P2R Extent to which phasic development leading to panicle initiation
! is delayed (expressed as GDD in oC-d) for each hour increase in
! photoperiod above P2O.
! Range 5-300 oC-d.
! Calibration: Modern rice varieties will have values in
! the lower range.
! P5 Time period in GDD oC-d) from beginning of grain filling (3 to
! 4 days after flowering) to physiological maturity with a base
! temperature of 9oC.
! Range 150-850 oC-d.
! Calibration: Ensure P1, P2O and P2R are correctly calibrated for
! anthesis data. Then calibrate P5 for observed maturity date.
! G1 Potential spikelet number coefficient as estimated from the
! number of spikelets per g of main culm dry weight (less leaf
! blades and sheaths plus spikes) at anthesis.
! Range 50-75 #/g. A typical value is 55 #/g.
! G2 Single grain weight (g) under ideal growing conditions, i.e.
! nonlimiting light, water, nutrients, and absence of pests
! and diseases.
! Range 0.015-0.030 g. Default 0.025 g.
! Calibration: Very low flexibility.
! G3 Tillering coefficient (scalar value) relative to IR64 cultivar
! under ideal conditions.
! Range 0.7-1.3.
! Calibration: A higher tillering cultivar would have a coefficient
! greater than 1.0.
! PHINT Phyllochron Interval (oC-d). Time interval in degree-days for each
! leaf-tip to appear under non-stressed conditions.
! Range 55-90 oC-d. Default 83 oC-d.
! Calibration: Recommend to not change unless field data on leaf
! numbers are available.
! THOT Temperature (oC) above which spikelet sterility is affected by
! high temperature.
! Range 25-34 oC. Default 28oC.
! Calibration: recommended to not change unless hot environment
! data are available. Convert old cultivars THOT = 28./G4.
! TCLDP Temperature (oC) below which panicle initiation is further delayed
! (other than P1, P2O and P2R) by low temperature.
! Range 12-18 oC. Default 15oC.
! Calibration: recommended to not change unless cold environment
! data are available. Convert old cultivars TCLDP = 15.*G5.
! TCLDF Temperature (oC) below which spikelet sterility is affected by
! low temperature.
! Range 10-20 oC. Default 15oC.
! Calibration: recommended to not change unless cold environment
! data are available. Convert old cultivars TCLDF = 15.*G5.
!
! The cultivar coefficient G5 was added to DSSAT Version 4.7.5
! The cultivar coefficients G4 and G5 were removed - DSSAT Version 4.8
! The cultivar coefficients THOT, TCLDP, and TCLDF were added to DSSAT Version 4.8
!
! P/G/N:Phenology/Growth/Not used for calbration
!
@VAR# VAR-NAME........ EXPNO ECO# P1 P2R P5 P2O G1 G2 G3 PHINT THOT TCLDP TCLDF
!Coeffient # 1 2 3 4 5 6 7 8 9 10 11
!Calibration P P P P G G G N G N N
999991 MINIMA . DFAULT 150.0 5.0 150.0 11.0 50.0 .0150 0.70 55.0 25.0 12.0 10.0
999992 MAXIMA . DFAULT 800.0 300.0 850.0 13.0 70.0 .0300 1.30 90.0 34.0 18.0 20.0
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