Data were presented as a mean of three replicates. Since it is essential to compare whether different forms of nitrogen are statistically significant, the results were statistically analyzed using SPSS v16.0 for Windows software (SPSS v16.0 IBM Corporation, Somers,NY, USA). The statistical differences were determined using a oneway analysis of variance (ANOVA) followed by a Tukey’s comparison test at p < 0.05.