Dear DSSAT Users I am new user of DSSAT. Working in Isalambad, Pakistan. Can anybody tell me which web site can give me the detail of extra terrestial solar radition (What is it?). Morover, how can i get the values of other constants used in the formula, to calculate the solar radiation. Thanks Muhammad Asif Scientific Officer Wheat Programme National Agricultural Researc Center Islamabad Pakistan _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com