Nitrate-Nitrogen Leaching and Modeling in Intensive Agriculture Farmland in China

Table 1

Selected physical properties and background values of soil samples.

Soil type	Depth; (cm)	Bulk density; (g·cm^−3)	Soil porosity; (%)	Organic matter content; (%)	Soil texture (%)
					Clay	Silt	Sand
Silt loam; (Huangtu town)	0–20	1.16	55.56	2.48	22	46	2
	20–40	1.42	47.26	1.92	24	44	4
	40–60	1.49	44.79	0.58	24	44	4
	60–80	1.43	44.75	0.45	24	44	4
	80–100	1.40	44.74	0.33	18	50	4
Silt loam; (Shengang town)	0–20	1.28	51.22	1.11	41	52	6
	20–40	1.30	51.88	2.11	43	49	6
	40–60	1.47	45.33	1.46	39	57	3
	60–80	1.49	44.79	0.36	26	67	5
	80–100	1.57	42.10	0.23	26	67	5
Silt loam; (Xishiqiao town)	0–20	1.08	58.20	2.88	48	50	3
	20–40	1.37	48.91	2.43	50	48	3
	40–60	1.41	47.59	0.78	48	44	8
	60–80	1.41	47.49	1.50	46	43	10
	80–100	1.42	47.09	1.66	44	42	14