AUTHORS 



Charles W. Philpot is a Research Forester 

 in the Fire Physics research work unit at Mis- 

 soula, Montana. His B. S. and M. S. degrees in 

 Forestry were obtained in 1961 and 1962, 

 respectively, from the University of California 

 at Berkeley. He received his Ph.D. in Plant 

 Science-Forestry in 1970 from the University 

 of Montana. He was assigned to the Pacific 

 Southwest Forest and Range Experiment 

 Station at Berkeley from 1961 to 1963 and to 

 the Riverside Forest Fire Laboratory in River- 

 side, California, from 1963 to 1966. In 1966 

 he transferred to Intermountain Station's 

 Northern Forest Fire Laboratory at Missoula, 

 where he initiated the first fuel chemistry 

 studies. He has shown the chemical composi- 

 tion of plant materials, pyrolytic reactions, 

 and the behavior of the extractives to be im- 

 portant in fire spread, intensity, and fuel ecol- 

 ogy. 



Gregg M. Johnson is a Physical Science 

 Technician in the Fire Management research 

 work unit at Missoula, Montana. He received a 

 B. S. degree in Chemistry at the University of 

 Montana in 1969. He joined the Northern 

 Forest Fire Laboratory in 1969 where he has 



been working in fire retardant chemical re- 

 search. 



Charles W. George was graduated from the 

 University of Montana in 1967 in Forest En- 

 gineering. He received his master's degree at 

 the University of Montana in 1969. In 1965, 

 he joined the Northern Forest Fire Labora- 

 tory staff in Missoula, Montana, where he is 

 now responsible for research dealing with for- 

 est fire retardant chemicals. 



Walter H. Wallace, Jr., is a Physical Science 

 Technician in the Fire Physics research work 

 unit at Missoula, Montana. He is currently 

 working on his B. S. degree in Chemistry at 

 the University of Montana. He came to the 

 Northern Forest Fire Laboratory in 1967 and 

 has worked primarily on fuel chemistry 

 studies. 



A. David Blakely was graduated from the 

 University of Montana in 1960 in Forestry. 

 He received his master's degree at the Univer- 

 sity of Montana in 1970. In 1967, he joined 

 the Northern Forest Fire Laboratory Fire 

 Management unit where he is involved in fire 

 retardant chemical research. 



ABSTRACT 



The benefits from fire use — including haz- 

 ard reduction, silvicultural manipulation, 

 pathogen control, and nutrient recycling — 

 might be forfeited by public reaction to 

 smoke, whether harmful or not. Generally, 

 the public desires alternatives to burning, but 

 might accept fire if direct control of emissions 

 were possible. The effects of diammonium 

 phosphate (DAP) and ammonium sulfate (AS) 



on particulate emission and fire intensity were 

 investigated. Particulate emission rate and to- 

 tal quantity were increased by DAP to several 

 times those produced from the control. In- 

 versely, very little increase was observed for 

 AS. Since burning rate for AS-treated fuels 

 was also decreased, this retardant might be 

 useful in smoke control through extension of 

 burning periods. 



