Table 2 Comparison of the variances and Cochran’s C test results for soil MBC and MBN concentrations and MBC:MBN under three N fertilization treatments (i.e. NN, LN and HN) in SG and GG cropland soils in a three-year long fertilization experimental site at the Tennessee State University (TSU) Agricultural Research Center in Nashville, TN, USA.

Crop	Fertilization	Plot	MBC	MBN	MBC:MBN
SG	NN	P1	816.06	24.91	15.45
	NN	P2	448.07	23.87	14.06
	LN	P1	1736.60	41.59	13.54
	LN	P2	948.26	53.11	8.69
	HN	P1	2073.30	19.30	14.62
	HN	P2	1129.91	111.19	22.32
Cochran’s test		C value	0.29	0.41	0.25
Cochran’s test		p-value	0.04	0.00	0.23
GG	NN	P1	1089.91	65.59	6.35
	NN	P2	618.26	54.00	13.28
	LN	P1	1007.95	43.80	8.07
	LN	P2	809.07	47.35	9.83
	HN	P1	1248.54	51.56	14.75
	HN	P2	769.38	26.78	3.00
Cochran^,s test		C value	0.23	0.23	0.27
Cochran^,s test		p-value	0.61	0.58	0.12
Total Cochran^,s test		C value	0.16	0.20	0.16
Total Cochran^,s test		p-value	0.03	0.00	0.06

Bold numbers in each column denote the first three largest variances than eleven, ten or nine plots, respectively at p-value < 0.05 (N = 24). The abbreviations are referred to Table 1.

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