The effects of levels of N and K fertilizer on soluble
oxalate content are presented in Table 2. Soluble oxalate
content in the first-cut napiergrass was affected (p0.05) by the N treatments.
This is in agreement with the results of Rahman et al.
(2008a) who observed that N fertilization with urea either
had no effect on the accumulation or even reduced the level
of soluble oxalate. However, in a nutrient solution study,
Rahman (2009) has shown that nitrate treated napiergrass
contained significantly higher soluble oxalate content than
ammonium treated napiergrass. It seems that oxalate
accumulation in napiergrass may be affected by form of N
application.