350 



+ - DAP 

 o - M-MAP 



1 2 3 4 5 6 7 8 9 10 11 



P2O5 Cg/ft sq:» 



Figure 8.— Effect of DAP, M-MAP, and S-MAP on weight loss rate of pine needles. 



2 r 



e 



1 2 3 4 5 6 7 



P2O5 Co/ft eq) 



Figure 9.— Effect of DAP, M-MAP, and S-MAP on spread rate of pine needles. 



S-MAP 

 M-MAP 



16 



