Figure 6. --The weight - 

 loss rate for guava 

 from the small-scale 

 burning tests . 



10 20 30 40 50 60 70 80 90 100 



Time in seconds 



2. The higher ash content of treated leaves affected the TGA curves, reducing the 

 weight-loss rate and increasing the residue at 450° C. This means less volatiles were 

 produced by the treated fuels. The DTA of treated leaves showed a reduction in 

 endotherm and exotherm intensity. 



3. The increase in ash and/or the decrease in extractives reduces the burning 

 rate of guava. 



4. This study gives support to the possibility of using TGA to replace the more 

 complicated and time-consuming burning tests. 



5. Treatment of guava with 2,4-D and 2,4,5-T does not increase flammability with 

 respect to naturally killed foliage, environmental conditions being equal. The herbi- 

 cides kill the leaves and reduce their moisture content, making them more flammable 

 than living leaves; however, no pyrolytic advantage is gained because of induced 



7 



