The PARAM program

A special program is available to compute crop parameters from the measured leaf area index and weights of crop organs provided in the experimental data file: PARAM.EXE. This program runs in the same way as DRATES in the previous exercise. PARAM should always be run after the program DRATES and after the appropriate development rates have been entered in the crop data file that is specified under FILEI1 in the control file PARAM.IN (in our case, the file JD305.DAT). Remember that PARAM uses the same control file PARAM.IN as the DRATES program. As DRATES, PARAM uses the measured data provided in the experimental data file (in our example MANAGE.TST as specified under FILEIT in PARAM.IN) to compute crop parameter values.

• Leaf area

Exercise objective:

·   Calibrating parameters that determine the growth of leaf area.

Suggested reading:

Chapters 3.2.9, 7.3 and 8.2 of the book ORYZA2000: Modeling lowland rice.

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• Partitioning

Exercise objective:

·   Calibrating the parameters that determine the partitioning of assimilates to crop organs.

Suggested reading:

Chapters 3.2.3, 7.3 and 8.2 of the book ORYZA2000: Modeling lowland rice.

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• Calibrating the loss rate of green leaves

Exercise objective:

·   Calibrating the fraction stem reserves.

·   Loss of green leaves and stem reserves.

Suggested reading:

Chapters 3.2.4 and 8.2 of the book ORYZA2000: Modeling lowland rice.

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