| PS 123 |
| PS 123 is a biophysical crop growth simulation model which predicts yields under several production levels based on basic plant physiology and soil process. Simulation could start with simple models of control production situation (high confidence on model result) and then increase the complexity for less controlled situation having less confidence in the outcome. The sub model (PS2) has ability to simulate the dry matter yield with different degrees of salinity having effect on osmotic potential Therefore, it is used to simulate the crop growth and yield. The three production situation of the model such as biophysical production potential (temperature and radiation limited), water limited production potential and nutrient limited production potential,explained by Dressen and Konijn (1992). |
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| Figure 1 : Flow diagram of the production simulation of model at three levels |
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| References |
 Rossiter, D.G., Biophysical Models in Land Evaluation. 2003, International Institute for Geo- Information Science and Earth Observation (ITC), Enschede, the Netherlands: Enschede.
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| Farshad, A., Analysis of integrated soil and water management practices within Different agricultural systems under semi - arid conditions of Iran and evaluation of their sustainability, in Earth Sciences. 1997, Publication No.57,: Enschede. p. 395. |
| Driessen P.M. and Konijn N.T., Land-use systems analysis. 1992, Wageningen: Wageningen Agricultural University. 230. |
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Development of Methodologies for
Land Degradation Assessment Applied to
Land Use Planning in Thailand |
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