WINSORG Latest Results
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BARCHART.gif (13804 bytes)WINSORG Latest Results

Using the latest data from the contract partners of the European Sorghum Network, the model was tested against data for a sorghum crop grown in Vagia, Greece; Guadiano, Italy and Podenza, Italy, in 1997. The data was supplied by the contract partners at: the Centre for Renewable Energy Sources, Greece; Dipartimento di Produzione Vegetale, Univ. della Basilicata, Italy and Ist. Botanica e Genetica veg., Univ. Cattolica del Sacro Cuore, Italy, respectively. Parameter values listed in Table 1.

Table 1: Input parameter values to simulate the growth of each sorghum crop grown in Vagia, Greece; Guadiano, Italy and Podenza, Italy in 1997.

Parameter

Value

Units

Vagia, Greece

Guadiano, Italy

Podenza, Italy
Latitude

38.21

41.03

44.58

oN
Growth dates:

Harvest day

Planting day

 

-

136

assumed 300

141

assumed 300

148

JD

JD
Planting density

10

10

20

Plants m-2
Soil type

Sandy loam

Sandy loam

(assumed)

Clay loam
Soil depth

1.8

-

-

m
Field capacity

0.32

-

-
Wilting point

0.15

-

-
Mean daily temperatures

Data supplied

Data supplied

Data supplied

oC
Rainfall / irrigation

Supplied

Drip irrigation 502

assumed 2.5mm day-1

Supplied

Drip irrigation 502

assumed 2.5mm day-1

Rainfall data supplied. No irrigation

required

mm
Volumetric water content

-

.703

.703

.715

.715

.724

.724

.652

.652

.662

.662

-

m3 m-3 for each of 10 layers

 

Default model values were used where not otherwise supplied.

The results of model simulations are compared with observed data in Figures 1, 2 and 3c.

Model simulation correlates with observed stem and above ground dry matter production, with r2 values of 0.91 and 0.87, respectively (Figs. 3b and 3c. Rut21b.spw; Rut21r2.spw).

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Figure 2. Simulated and measured dry matter production and LAI of sorghum crop grown at Guadiano, Italy in 1997. Regression analysis results in r2 values of 0.95, 0.94, 0.88 and 0.77 for above ground, stem and leaf dry weights and LAI, respectively.

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Figure 3. Simulated and measured dry matter production and LAI of sorghum crop grown at Podenza, Italy in 1997. Regression analysis results in r2 values of 0.95, 0.91, 0.86 and 0.76 for above ground, stem and leaf dry weights and LAI, respectively.

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Last modified: August 19, 1997