0.7 



otO.6- 



en 

 30.5] 



£o.4 



> 



o0.3^ 



< 



UJ 



<£0. 2r 



i±j 

 S 



=>0. H 



0.0 



a ae 



a 53 



0.50 



a 87 



5 10 20 



GYPSUM LEVEL (Mg/ha) 



Figure 5. Effect of gypsum addition of urease activity of brackish marsh soil. 



\ 

 en 



~o.&| 



^0.4 



< 



UJ 



to 



uj0.2 

 a: 



0.Q 



a 82 



0.1 



0.77 



a 5e 



a 53 



0. 4 0. 8 



SALINITY LEVEL (S/m) 



Figure 6. Effect of salinity on urease activity of brackish marsh soil. 



95 



