Table 1.

Physical properties of the soil at each oak tree study site.

	Depth (cm)	Textural Analysis^{^a}				Bulk		Restrictive
Site		Sand	Silt	Clay	Classification^{^b}	Density^{^c}	R.L.D.^{^d}	B.D.^{^e}
1	10-15	40	36	24	Loam	1.49		1.50-1.60
	25-30	18	49	33	Sil. CI. Loam	1.36		1.40-1.45
	90-100	17	54	29	Sil. CI. Loam	1.33		1.40-1.45
2	10-15	39	46	15	Loam	1.51		1.50-1.60
	25-30	70	20	10	Sndy. Loam	1.29		1.60-1.70
	90-100	61	29	10	Sndy. Loam	1.30		1.60-1.70
3	10-15	62	14	24	Sndy. CI. Loam	1.40	5.24	1.55-1.75
	25-30	46	26	28	Clay Loam	1.35	3.29	1.45-1.55
	90-100	33	25	42	Clay	1.32	1.22	1.40-1.55
4	10-15	52	26	22	Sndy. CI. Loam	1.57		1.55-1.75
	25-30	57	25	18	Sndy. Loam	1.55		1.60-1.70
	90-100	29	43	28	Loam	1.48		1.50-1.60
5	10-15	26	39	35	Clay Loam	1.56	0.68	1.45-1.55
	25-30	37	33	40	Clay Loam	1.72	0.28	1.45-1.55
	90-100	25	35	40	Clay/Cl. Loam	1.30	0.11	1.45-1.55
6	10-15	23	43	34	Clay Loam	1.54		1.45-1.55
	25-30	22	43	35	Clay Loam	1.60		1.45-1.55
	90-100	21	38	41	Clay	1.19		1.40-1.55

↵^{^a} Percent sand, silt and clay, by weight.
↵^{^b} Textural classification. Sil.=silty, CI.=clay, Sndy.=sandy.
↵^{^c} Bulk density in g/cm³
↵^{^d} Root length density in cm root/cm³ soil.
↵^{^e} The bulk density at which a soil of this textural classification would be predicted to inhibit root growth (see Morris and Lowery, 1988).