ABSTRACT
To develop basis for strategic or arranged decision
making towards crop yield improvement in Thailand, a new method in which crop
models could be used is essential. Therefore, the objective of this study was
to measure cultivar specific parameters by using DSSAT (v4.7) Cropping
Simulation Model (CSM) with five upland rice genotypes namely Dawk Pa-yawm, Mai
Tahk, Bow Leb Nahng, Dawk Kha 50 and Dawk Kahm. Experiment was laid out in a
Completely Randomized Design (CRD) with split plot design. Results showed that five
upland rice genotypes had significantly affected each other by different
temperature treatments (28°C, 30°C, 32°C) with grain yield, tops weight,
harvest index, flowering, and maturity date. At the same time, all the
phenological traits had highly significant variation with the genotypes. The
cultivar specific parameters obtained by using a temperature tolerant cultivar
(Basmati 385) with five upland genotypes involved in the DSSAT4.7-CSM. Model
evaluation results indicated that utilizing the estimated cultivar coefficient
parameters, model simulated well with varying temperature treatments as
indicated by the agreement index (d-statistic) closer to unity. Hence, it was
estimated that model calibration and evaluation was realistic in the limits of
test cropping seasons and that CSM fitted with cultivar specific parameters can
be used in simulation studies for investigation, farm managing or decision
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