net.simplace.sim.model.FWSimComponent

net.simplace.sim.components.experimental.grassland.lintul.LintulPhenology

All Implemented Interfaces:: net.simplace.sim.util.FWSimFieldContainer

public class LintulPhenology extends net.simplace.sim.model.FWSimComponent

LintulPhenology.java calculates the development stage (DevStage) of a crop based on the ratio between accumulated degree days and the a user-defined, crop and cultivar specific temperature sum requirement . In addition, based on the development stage, the date and the day of the year (DOY) when certain phenology events occur (e.g. anthesis, physiological maturity) are determined .

anthesis

The phenological development of the crop starts with the emergence day. This day is either determined by increasing the day of the year (DOY) when sowing occurs by a user-specified number of days. The sowing date (DOY when sowing occurs) is specified in the SimComponent "Management". Crop development between emergence and anthesis is triggered by the accumulated temperature sum (TSUM). TSUM is increased daily by the rate of effective temperature until anthesis (RTEFFAnt), which is an input either from the simComponent WeatherTransformer or from the SimComponent VernalisationAndPhotoresponse (if effective temperature depends on photoperiod and/or vernalisation requirements). The effective temperature in the WeatherTransformer is calculated as the difference between the average daily air temperature (AirTemperatureMean) and the base temperature of the crop before anthesis (BaseTempBeforeAnt as defined in the crop property file). Only days where AirTemperatureMean > BaseTempBeforeAnt are accounted for. The ratio between actual TSUM at a given day and the air temperature sum to anthesis (AirTemperatureSumAnthesis) is added daily to the development stage index (DevStage) as

\[ \begin{eqnarray} DevStage & = & TSUM / AirTemperatureSumAnthesis \end{eqnarray} \]

maturity

Similarly, crop development between anthesis and maturity is triggered by the accumulated temperature sum (TSUM). From anthesis to maturity the daily rate of effective temperature (RTEFFMat) is an input from the SimComponent WeatherTransformer where RTEFFMat is depends on the difference between the average daily air temperature (AirTemperatureMean) and the base temperature of the crop after anthesis (BaseTempBeforeMat as defined in the crop property file). Only days where AirTemperatureMean > BaseTempBeforeMat are accounted for. Again, the ratio between actual TSUM at a given day and the air temperature sum from anthesis to maturity (AirTemperatureSumMaturity) is added daily to the development stage index (DevStage) as

\[ \begin{eqnarray} DevStage & = & 1 + TSUM / AirTemperatureSumAnthesis \end{eqnarray} \]

References: Goudriaan, H.H. Van Laar, 1994. Modelling Potential Crop Growth Processes, Kluwer Academic Publishers, Dordrecht (1994) 238 pp

Content Type	Name	Description	Data Type	Unit	Min Value	Max Value	Default Value
constant	cAirTemperatureSumAnthesis	Temperature sum after energence when anthesis of plant is reached	DOUBLE	°C d	0.0	5000.0	650.0
constant	cAirTemperatureSumMaturity	Temperature sum after emergency when maturity of plant is reached	DOUBLE	°C d	0.0	10000.0	1350.0
constant	cAirTemperatureSumMilkripeness	Temperature sum when milk ripeness of plant is reached	DOUBLE	°C d	0.0	7000.0	-
input	cRelativeDayOfEmergence	Days between sowing and emergence	INT	d	0	366	11
input	iDoGrazen	Percentage of the AboveGroundBiomass that is grazed or cut on enduring plants	DOUBLE	1	0.0	1.0	1.0
input	iDoHarvest	true at the day of harvest	BOOLEAN	1	-	-	false
input	iDoSow	true at the day of sowing	BOOLEAN	1	-	-	false
input	iRTEFFAnt	Daily effective temperature before anthesis	DOUBLE	°C	0.0	40.0	0.0
input	iRTEFFMat	Daily effective temperature after anthesis	DOUBLE	°C	0.0	40.0	0.0
state	sDevStage	Development stage of the crop (1.0=anthesis, 2.0=physiological maturity	DOUBLE	1	0.0	-	0.0
state	sTSUM	Temperature sum as accumulated effective temperature after emergence	DOUBLE	°C d	0.0	10000.0	0.0
rate	rDevStageRate	increment of the dev stage	DOUBLE	d-1	0.0	-	0.0
out	AnthesisDOY	DOY of Anthesis	INT	1	-	-	0
out	AnthesisDate	Date of Anthesis	DATE	1	-	-	-
out	CropCycleCount	Number of growth periods, starting with 0 and incremented on harvest. Used for crop rotation.	INT	1	0	100	0
out	EmergenceDOY	DOY of Emergence	INT	1	-	-	0
out	EmergenceDate	Date of Emergence	DATE	1	-	-	-
out	IsAnthesis	true at the anthesis date	BOOLEAN	1	-	-	false
out	IsEmergence	true at the emergence date	BOOLEAN	1	-	-	false
out	IsMaturity	true at the maturity date	BOOLEAN	1	-	-	false
out	IsMilkripeness	true at the milkripeness date	BOOLEAN	1	-	-	false
out	IsPhenologyEvent	true if either sowing/emergence/anthesis/maturity date occured	BOOLEAN	1	-	-	false
out	IsSowing	true at the sowing date	BOOLEAN	1	-	-	false
out	MaturityDOY	DOY of Maturity	INT	1	-	-	0
out	MaturityDate	Date of Maturity	DATE	1	-	-	-
out	MilkripenessDOY	DOY of Milkripeness	INT	1	-	-	0
out	MilkripenessDate	Date of Milkripeness	DATE	1	-	-	-
out	RTEFF	Daily effective temperature used to calculate the temperature sum and development stage at a given day	DOUBLE	°C	0.0	40.0	0.0
out	SowingDOY	DOY of Sowing	INT	1	-	-	0
out	SowingDate	Date of Sowing	DATE	1	-	-	-

Class LintulPhenology

anthesis

maturity

Component Variables

Nested Class Summary

Nested classes/interfaces inherited from class net.simplace.sim.model.FWSimComponent

Field Summary

Fields inherited from class net.simplace.sim.model.FWSimComponent

Constructor Summary

Method Summary

Methods inherited from class net.simplace.sim.model.FWSimComponent

Methods inherited from class java.lang.Object

Constructor Details

LintulPhenology

Method Details

createVariables

init

process

fillTestVariables

clone