Reclaiming Subsidized Land: An Evaluation of Coal Gangue Interlayers

Table 1

Selected chemical and physical properties of topsoil, subsoil, and coal gangue.

Properties	Texture			Total potassium (g/kg)	Total nitrogen (g/kg)	Total phosphorus (g/kg)	Organic matter (g/kg)	Available phosphorus (mg/kg)	Alkali- hydrolysable nitrogen (mg/kg)	Available potassium (mg/kg)	pH
	Sand (%)	Silk (%)	Clay (%)
Topsoil	8.35	73.98	17.67	12.56	0.71	0.16	6.99	0.88	27.93	241.1	7.62
Subsoil	9.11	74.14	16.75	13.21	0.60	0.15	5.08	1.46	46.31	247.28	7.67
Coal gangue	Gravel			8.47	1.25	0.04	82.71	0.42	13.23	352.32	10.04