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Seasonal pattern o observed and simulated minimum/maximum temperature f comparisons of Sakaeo province, 1981 (TMAXOB = maximum temperature of observation, TMINOB = minimum temperature of observation, TMAXSI = maximum temperature of simulation, TMINSI = minimum temperature of simulation) 17 Amount of rainfall (mm) 500 RainOB RainSI 400 300 200 100 0 1 2 3 4 5 6 7 8 9 10 11 12 month Figure 13.Simulated and observed amount of monthly rain fall comparisons of Sakaeo province, 1981 (RainOB = observation rain fall, RainSI = Simulation rain fall) Temperature (mm) 40 30 Maximum temperature 20 Average temperature Minimum temperature 10 0 Observation Simulation Figure 14.Maximum/minimum and average temperature of observation and simulation weather data comparison of Sakaeo province, 1981 ( I = standard deviation) 18 Annual rainfall (mm) Maximum rainfall/day (mm) Number of rainfall day (day/year) 2000 300 250 1600 200 Annual rainfall 1200 150 Maximum rainfall/day 800 100 Number of rainfall day 400 50 0 0 Observation Simulation Figure 15. Comparison of simulated rice yields under observation and generated weather data on base year line (1981-89) of Chiang Rai, Sakonnakorn and Sakaeo province Simulated rice yield (kg ha-1 ) 4000 3000 2000 1000 RMSE = 337.2 0 0 1000 2000 3000 Observed rice yield (kg ha -1) A 4000 21 Simulated rice yield (kg ha-1 ) 4000 Simulated rice yield (kg ha-1 ) 4000 3000 3000 2000 2000 1000 1000 RMSE = 351.8 RMSE = 295.2 0 0 0 1000 2000 3000 4000 Observed rice yield (kg ha-1 ) B 0 1000 2000 3000 4000 Observed rice yield (kg ha-1 ) C Figure 18.