RESULTS 



A total of 133 treated and untreated fuel beds were burned during the study. Of 

 these, 73 were composed of ponderosa pine needles and the remaining were aspen 

 excelsior. The treated beds received applications of (NHi + ) 2 SOi + or (NH^) 2^0^ . Data 

 for the untreated fuel beds are given in table 4 of the appendix. A summary of the 

 test data for (NH^^HPO^ and (NHi+^SO^ treated ponderosa pine needle fuel beds is 

 presented in tables 5 and 6 of the appendix. A summary of the test data for treated 

 aspen excelsior fuel beds is given in tables 7 and 8 of the appendix. 



The relationship between the amount of chemical applied per square foot of fuel 

 bed and the rate of fire spread through the pine needle and excelsior fuel beds is 

 shown in figures 6, 7, 8, and 9. The rate of weight loss and equivalent energy release 

 rate (assuming the energy released is equal to heat content of the fuel times the weight 

 loss rate) as a function of the amount of chemical for the two types of fuel beds are 

 shown in figures 10, 11, and 12. The percent increase in residue over the average 

 residue for untreated was calculated for each fire. This percent increase in residue 

 as related to the amount of chemical applied is shown in figures 13 and 14. 



10 



