I'm Trying to model the impact of climate change on maize production in the Southern Highlands of Tanzania (8.55S and 33.31 E)using DSSAT3 (as my MSc. dissertation topic). I'm using a cultivar H6302; which is a hybrid variety mainly growm in that area.It is a high altitude variety (around 1500m plus) yielding about 6tons/ha (on experimental plots).The rainfall in the area is about 900mm annually and the max.and min. temperature are around 25 and 15 degrees Celcius respectively. Unfortunaterly I do not have the details of its genetic coefficients: ECO#; P1; P2; P5; G2; G3; and PHNT as they are defined in the DSSAT3 guiding mannual vol.2 pg 201. Can any body please assist me in defining these variables for this cultivr; or can anybody suggest a cultivar within dssat3 which has similar variables and can be used in case I dont get the right information!. Please assist Richard