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net.simplace.client.simulation.lap.lintul.LintulRoot

Root depth growth calculation (only root depth, no root biomass)

LintulRoot.java The SimComponent LintulRoot.java calculates the daily increase in root depth (RROOTD in m d-1) depending on the crop development stage (DevStage) and the actual volumetric soil water content (WC). Vertical root growth only occurs when (1) the development of the crop has not reached anthesis (DevStage <1) and (2) the actual rooting depth (ROOTD in m) is below the user defined maximum rooting depth (ROOTDM in m). In this case, daily root growth rate depends on the crop specific maximum daily root growth rate (RRDMAX in m d-1) and the volumetric soil water content (WC in m3 m-3) in relation to the volumetric soil water content at wilting point (WCWP in m3 m-3):

\[ \begin{eqnarray} if & & ROOTD > ROOTDM & & and & & DevStage < 1: RROOTD = RRDMAX \cdot INSW(WC-WCWP) \end{eqnarray} \]

If crop developemnt has passed beyond anthesis or if ROOTD has reached ROOTDM, the daily increase in rrot depth is zero.

References: van Oijen, M. and P. Lefelaar. 2008. Lintul-2: water limited crop growth: A simple general crop growth model for water-limited growing conditions. Waageningen University, The Netherlands.

Component Variables

Content Type	Name	Description	Data Type	Unit	Min Value	Max Value	Default Value
constant	cInitRootDepth	Initial rooting depth (at crop emergence)	DOUBLE	m	0.0	5.0	0.1
constant	cMaxRootDepth	Maximum rooting depth	DOUBLE	m	0.0	5.0	1.2
constant	cMaxRootGrowthRate	Maximum rate of increase in rooting depth	DOUBLE	m/d	0.0	2.0	0.012
constant	cWaterContentWiltingPoint	Soil water content at wilting point	DOUBLE	m3/m3	0.0	1.0	0.075
input	iDevStage	Development stage of the plant	DOUBLE	1	0.0	20.0	0.0
input	iDoHarvest	If plant is harvested on this day	BOOLEAN	1	-	-	false
input	iDoSow	If plant is sown on this day	BOOLEAN	1	-	-	false
input	iGlobalWaterContent	Actual amount of water in the soil (WA)	DOUBLE	mm	0.0	1000.0	-
state	sRootDepth	Root Depth	DOUBLE	m	0.0	20.0	0.0
rate	rRateRootDepth	Rate of Root Depth	DOUBLE	m/d	0.0	2.0	0.0

public class LintulRoot extends net.simplace.simulation.model.FWSimComponent {
// Public Constructors
public LintulRoot();

// 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

initializes the fields by getting input and output FWSimVariables from VarMap

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

process the algorithm and write the results back to VarMap

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

creates a clone from this SimComponent for use in other threads

}

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