net.simplace.sim.components.experimental.amei.Vernalisation

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)

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

Applying Vernalisation

Before anthesis:

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

After anthesis:

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

cApplyPhotoresponse and cApplyVernalisation control whether photoresponse, vernalisation or both are applied. If the control variables are false, the coresponding factor is always 1, meaning that the effect is not applied.

The state sVernalDays has to be reset on each sowing. Therefore the input iDoSow has to be provided.

References

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

Component Variables

Content Type	Name	Description	Data Type	Unit	Min Value	Max Value	Default Value
constant	cApplyVernalisation	Flag to activate vernalisation (True: crops requiring vernalisation for flower initialisation	BOOLEAN	1	-	-	true
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	1	0	400	70
constant	cVernalDaysMin	Crop specific minimum number of days required for vernalisation	INT	1	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	iDevStageBaseShoot	Development stage for base shoot	DOUBLE	1	0.0	10000.0	0.5
input	iDoSow	true if sowing day	BOOLEAN	1	-	-	false
input	iPhotoPeriodFactor	PhotoPeriodFactor	DOUBLE	1	0.0	1.0	-
input	iTSumBaseAnt	Daily effective temperature before anthesis	DOUBLE	°C	0.0	10000.0	-
input	iTSumBaseMat	Daily effective temperature after anthesis	DOUBLE	°C	0.0	10000.0	-
input	iTSumBaseShoot	Daily effective temperature after shooting - if given	DOUBLE	°C	0.0	10000.0	-
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	RTSUM	Daily effective temperature used to calculate the temperature sum and development stage at a given day	DOUBLE	°C	0.0	50.0	-
out	VernalisationFactor	daily vernalisation factor	DOUBLE	1	0.0	1.0	0.0

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

// Public Instance Methods

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

Create the FWSimVariables as interface for this SimComponent

// Protected Instance Methods

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

protected void reset();

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

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

}

Hierarchy: java.lang.Object - net.simplace.sim.model.FWSimComponent (net.simplace.sim.util.FWSimFieldContainer) - Vernalisation