TABLE 2.

The average contents and ratios of C and N in soils and microbial residues.

Treatments			SOC (g kg–1)	TN (g kg–1)	BRC (g kg–1)	BRN (g kg–1)	FRC (g kg–1)	FRN (g kg–1)	BRC/SOC	BRN/TN	FRC/SOC	FRN/TN
Original soil			14.2	1.84	0.92	0.14	5.15	0.8	6.5	7.4	36.3	43.5
Rice season	0–10 cm	NoF	12.3	1.85	1.64	0.25	4.76	0.74	13.4	13.8	38.7	41.5
		NPK	15.9	1.95	2.14	0.32	4.99	0.77	13.5	16.3	31.5	39.7
		M	15.9	2.01	2.06	0.3	5.9	0.92	13.2	15.2	37.6	45.8
		NPKM	19.7	2.41	2.13	0.32	6.31	0.98	10.9	13.3	32.1	40.6
	10–20 cm	NoF	11.6	1.62	1.36	0.2	3.39	0.53	11.8	12.4	29.5	32.5
		NPK	13.1	1.63	1.19	0.18	3.1	0.48	9.1	10.9	23.7	30.0
		M	12.6	1.69	1.68	0.25	4.03	0.63	13.6	14.8	32.2	37.6
		NPKM	21.8	1.76	2.07	0.31	4.84	0.75	9.5	17.6	22.3	42.5
Wheat season	0–10 cm	NoF	10.9	1.64	1.92	0.29	5.52	0.86	18.3	17.9	51.8	53.1
		NPK	16.0	2.04	1.93	0.29	5.42	0.84	12.1	14.4	33.8	41.6
		M	16.3	2	2.15	0.32	5.69	0.89	13.2	16.0	34.8	44.3
		NPKM	19.3	2.35	2.16	0.32	6.28	0.98	11.3	13.9	32.7	41.9
	10–20 cm	NoF	12.9	1.78	1.97	0.29	4.95	0.77	15.6	16.7	38.6	43.3
		NPK	13.8	1.87	2.16	0.32	6.53	1.02	15.7	17.1	47.4	55.0
		M	23.4	2.83	2.42	0.36	7.37	1.15	10.4	12.8	31.5	40.4
		NPKM	21.9	2.6	2.96	0.44	7.89	1.23	13.5	17.0	36.0	47.2
p-value	Crop rotation		ns	**	***	***	***	***	*	ns	***	***
	Soil depth		ns	ns	ns	ns	ns	ns	*	ns	***	***
	Fertilization regimes		***	**	**	**	**	**	ns	ns	ns	ns
NoF			c	c	b	b	b	b
NPK			b	bc	b	b	ab	ab
M			b	ab	ab	ab	ab	ab
NPKM			a	a	a	a	a	a

Significant effects were tested by LSD t-test. Asterisk indicates significance, * p < 0.05, ** p < 0.01, *** p < 0.001.