net.simplace.client.simulation.lap.VernalisationAndPhotoresponse

Reduces daily temperature increment by vernalisation and photoresponse.

Vernalisation

Vernalisation days

The daily increment of vernalisation days is determined by daily average temperature iDAVTEMP

\[ \begin{eqnarray} VDI(iDAVTEMP) & = & \left\{ \begin{array}{l} 0 & \text{if} \quad iDAVTEMP \lt cTlowCritical\\ \frac{iDAVTEMP - cTlowCritical}{cTlow - cTlowCritical} & \text{if} \quad cTlowCritical \le iDAVTEMP \lt cTlow \\ 1 & \text{if} \quad cTlow \le iDAVTEMP \lt cThigh \\ \frac{cThighCritical - iDAVTEMP}{cThighCritical - cThigh} & \text{if} \quad cThigh \le iDAVTEMP \lt cThighCritical \\ 0 & \text{if} \quad cThighCritical \le iDAVTEMP\\ \end{array} \right. \end{eqnarray} \]

And sVernalDays is incremented by VDI(iDAVTEMP).

Vernalisation factor

VernalisationFactor (VF) is determined by the sVernalDays (VD)

\[ \begin{eqnarray} VF(VD) & = & \left\{ \begin{array}{l} 0 & \text{if} \quad VD \lt cVernalDaysMin\\ \frac{VD - cVernalDaysMin}{cVernalDaysMax - cVernalDaysMin} & \text{if} \quad cVernalDaysMin \le VD \lt cVernalDaysMax \\ 1 & \text{if} \quad cVernalDaysMax \le VD \\ \end{array} \right. \end{eqnarray} \]

Potoresponse Factor

DayLength is calculated from current DOY and cLatitude

Photoresponse curve is interpolated from cPhotoresponseTable, which is a double array, holding the duration (in hours) in the even entries and the coresponding factors in the odd entries.

The PhotoresponseFactor is then chosen from the interpolated curve according to the Daylength.

After anthesis, no daylength effects are taken into account (PhotoresponseFactor = 1).

Applying Vernalisation and Photoresponse

Before anthesis:

\[ \begin{eqnarray} RTSUM & = & iTSumBaseAnt \cdot Min(PhotoresponseFactor, VernalisationFactor) \end{eqnarray} \]

After anthesis:

\[ \begin{eqnarray} RTSUM & = & iTSumBaseMat \cdot Min(PhotoresponseFactor, VernalisationFactor) \end{eqnarray} \]

References:

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

Class is stateful by keeping the vernalDays in the instance.

Component Variables

Content Type	Name	Description	Data Type	Unit	Min Value	Max Value	Default Value
constant	cApplyPhotoresponse	Flag to activate photo response (True: daylength sensitive crops)	BOOLEAN	1	-	-	true
constant	cApplyVernalisation	Flag to activate vernalisation (True: crops requiring vernalisation for flower initialisation	BOOLEAN	1	-	-	true
constant	cLatitude	Latitude of the simulated location	DOUBLE	°	0.0	90.0	60.0
constant	cPhotoresponseTable	Crop specific photo response table as function of daylength in hours	DOUBLEARRAY	1	-	-	[Ljava.lang.Double;@d969452
constant	cThigh	Upper temperature threshold for vernalisation; days with higher mean air temperature are not fully considered as a vernalisation day	DOUBLE	°C	-40.0	50.0	10.0
constant	cThighCritical	Upper temperature threshold for vernalisation; days with higher mean air temperature don't contribute at all for vernalisation day	DOUBLE	°C	-40.0	50.0	17.0
constant	cTlow	Lower temperature threshold for vernalisation, days with lower mean air temperature are not fully considered as a vernalisation day	DOUBLE	°C	-40.0	50.0	3.0
constant	cTlowCritical	Lower critical temperature threshold for vernalisation, days with lower mean air temperature don't contribute at all for vernalisation day	DOUBLE	°C	-40.0	50.0	-4.0
constant	cVernalDaysMax	Crop specific maximum number of days required for vernalisation	INT	K	0	400	70
constant	cVernalDaysMin	Crop specific minimum number of days required for vernalisation	INT	K	0	100	10
input	iDAVTMP	Daily mean air temperature	DOUBLE	°C	0.0	50.0	-
input	iDevStage	Development stage of the crop (1.0=anthesis, 2.0=physiological maturity)	DOUBLE	1	0.0	3.0	-
input	iDoSow	true if sowing day	BOOLEAN	1	-	-	false
input	iTSumBaseAnt	Daily effective temperature before anthesis	DOUBLE	K	0.0	10000.0	-
input	iTSumBaseMat	Daily effective temperature after anthesis	DOUBLE	K	0.0	10000.0	-
state	sPhotoresponseArray	Photo response array as function of daylength in minutes	DOUBLEARRAY	1	0.0	20.0	-
state	sVernalDays	actual Vernal Days	DOUBLE	1	0.0	400.0	0.0
out	DayLength	Day Length in minutes	INT	min	0	1441	0
out	PhotoresponseFactor	daily photoresponse factor	DOUBLE	1	0.0	1.0	0.0
out	RTSUM	Daily effective temperature used to calculate the temperature sum and development stage at a given day	DOUBLE	K	0.0	50.0	-
out	VernalisationFactor	daily vernalisation factor	DOUBLE	1	0.0	1.0	0.0

public class VernalisationAndPhotoresponse extends
net.simplace.simulation.model.FWSimComponent {
// Public Constructors
public VernalisationAndPhotoresponse(String aName, HashMap aFieldMap,
HashMap aInputMap, Element aSimComponentElement, FWSimVarMap aVarMap,
int aOrderNumber);
public VernalisationAndPhotoresponse();

// Class Methods

public static Double[] PhotoResponseToArray(Double[] TAB);

Stores the photo response factors for a duration in minutes in an array

TAB table for linear interpolation

returns the array with minutes as key and Photo response as value

// Public Instance Methods

public HashMap createVariables(); // Defines
net.simplace.simulation.model.FWSimComponent

Create the FWSimVariables as interface for this SimComponent

// Protected Instance Methods

protected void init(); // Defines
net.simplace.simulation.model.FWSimComponent

protected void reset();

protected void process(); // Defines
net.simplace.simulation.model.FWSimComponent

protected FWSimComponent clone(FWSimVarMap aVarMap);
// Defines net.simplace.simulation.model.FWSimComponent

}

Hierarchy: java.lang.Object - net.simplace.simulation.model.FWSimComponent (net.simplace.simulation.util.FWSimFieldContainer) - VernalisationAndPhotoresponse