		Levene’s Test for Equality of Variances		t-Test for Equality of Means
		t	df	Sig. (p = 0.05)	Mean Difference	Std. Error Difference
		Lower	Upper	Lower	Upper	Lower
Soil organic carbon	Equal variances assumed	−0.204	23	0.840	−0.85641	4.20116
Soil organic carbon	Equal variances not assumed	−0.208	19.991	0.837	−0.85641	4.12080
Nitrogen	Equal variances assumed	0.012	23	0.991	0.00295	0.24740
Nitrogen	Equal variances not assumed	0.012	17.342	0.990	0.00295	0.24090
Potassium	Equal variances assumed	2.999	23	0.006	4.45385	1.48495
Potassium	Equal variances not assumed	3.057	20.108	0.006	4.45385	1.45705
Phosphorus	Equal variances assumed	−1.533	23	0.139	−0.47545	0.31005
Phosphorus	Equal variances not assumed	−1.541	22.975	0.137	−0.47545	0.30855