TABLE 5.

Statistical evaluation of gene abundance by multifactorial ANOVA

Factor	Pa
	nifH	amoA (AOB)	amoA (AOA)	nirS	nirK
Total
EC	0.00016*	0.00187*	0.00000*	0.00000*	0.00000*
Organic	0.00584*	0.00010*	0.00663*	0.01226*	0.00110*
Urea	0.86490	0.00000*	0.76170	0.03195*	0.00897*
EC × organic	0.01611*	0.06726	0.75901	0.00226*	0.02470*
EC × urea	0.97056	0.01246*	0.94151	0.77689	0.26311
Organic × urea	0.88557	0.91020	0.40479	0.48152	0.67149
EC × organic × urea	0.96940	0.34970	0.70371	0.11885	0.20102
EC30
Organic	0.21544	0.01357*	0.01120*	0.00461*	0.00226*
Urea	0.90946	0.00011*	0.92578	0.08370	0.03994*
Organic × urea	0.95764	0.50181	0.41531	0.54840	0.31779
EC60
Organic	0.00028*	0.01036*	0.44637	0.00033*	0.12915
Urea	0.91401	0.00004*	0.76804	0.44207	0.79858
Organic × urea	0.75057	0.43477	0.69985	0.98800	0.68548
EC90
Organic	0.78713	0.06200	0.12951	0.48282	0.72698
Urea	0.62794	0.000109*	0.74827	0.19272	0.01398*
Organic × urea	0.71996	0.30539	0.19268	0.08998	0.07509

^aThe P values describe the impact of plant development stages and nitrogen fertilizing treatments on functional genes involved in nitrogen turnover. Asterisks indicate significant effects of plant development stages or fertilizing treatments, respectively, on the functional genes, after analysis by Tukey's test with SPSS 13.0.