Dear Users,

I was using WeatherMan for creating the weather data files for DSSAT. But,
some issues brought some questions up  for me:



1) WeatherMan uses the unit KM/day (=M/Sec*86.4) for wind speed. In this
case, when I use Penmann24 method for ET calculation, the simulation results
seem ok. But, when I use FAO56, the yields become near zero. When I changed
the values of wind speed into M/Sec, the results seemed more acceptable and
very similar to Penmann24. What is the correct unit for Wind?

2) Why WeatherMan doesn't export Relative Humidity data into DSSAT weather
files? I had to write an algorithm in MATLAB to create DSSAT weather files
for all weather variables.

3) What are the exact meaning of TAV and AMP in weather data files? Is these
correct:

                TAV : Mean value for Average Temperature through the whole
data series.

                AMP : ?