8. Edit Crop2ML ModelComposite

You can edit a ModelComposite by changing its meta-information or removing some links or adding other links.

8.1. How

To edit a Crop2ML ModelComposite in CropMStudio:

1. On the home interface click on “Model Edition”

2. Select the package that contains this model. The list of all ModelUnits and ModelComposite appear

3. Select the ModelComposite.

4. Edit what part you want.

8.2. Exercise:

Consider the PriestlyTaylor model unit. Based on the meta-information below, create the Crop2ML ModelUnit and link it with the two others ModelUnits of the ModelComposite.

• Model equations in CyML

evapoTranspirationPriestlyTaylor = max((Alpha * hslope * (netRadiationEquivalentEvaporation) / (hslope + psychrometricConstant)), 0.0)

• Model meta-information

Parameters meta-information

name	description	default	min	max	unit
psychrometricConstant	psychrometric Constant	0.66	0.0	1.0
Alpha	Priestley-Taylor evapotranspiration proportionality constant	1.5	0.0	100.0

Variables meta-information

name	description	default	min	max	unit
netRadiationEquivalentEvaporation	net Radiation in Equivalent Evaporation	638.142	0.0	5000.0	g/(m**2*d)
hslope	the slope of saturated vapor pressure temperature curve at a given temperature	7.2	-30.0	45.0	hPa/degC
evapoTranspirationPriestlyTaylor	evapoTranspiration of Priestly Taylor		0.0	10000.0	g/(m**2*d)