Fragipan Horizon Fragmentation in Slaking Experiments with Amendment Materials and Ryegrass Root Tissue Extracts

Table 1

Selected physical, chemical, and mineralogical properties of the Zanesville soil used in the study.

Horizon	Depth (cm)	Sand (%)	Silt (%)	Clay (%)	Texture	pH (1 : 1 H2O)	Ca	Mg	K	Na	CEC	O M (%)	Clay mineralogy^†
							meq/100 g
Ap	0–20	8.7	70.1	21.2	Silt loam	7.52	4.98	1.07	0.13	0.05	9.0	3.94	V/HIV44 K26 Mi9 Q10 Gi8 F3
Bt1	20–42	5.3	75.4	19.3	Silt loam	5.05	3.12	1.58	0.16	0.08	12.7	2.10	V/HIV52 K23 Mi9 Q9 Gi3 F4
Bt2	42–65	4.2	72.4	23.4	Silt loam	4.52	1.42	2.38	0.17	0.15	13.0	0.33	Sm23 V/HIV31 K24 Mi11Q7 F4
Btx1	65–127	10.5	65.3	24.2	Silt loam	4.28	0.80	2.96	0.13	0.18	11.8	0.19	Sm23 V/HIV40 K28 Q5 F4
Btx2	127–140+	13.9	55.4	30.7	Silty clay loam	4.23	1.05	4.21	0.10	0.30	13.3	0.19	Sm23 V/HIV18 K39 Q9 Gi4 F3 Go4

Sm: smectite; V/HIV: hydroxy-interlayered vermiculite; K: kaolinite; Mi: mica; Q: quartz; Gi: gibbsite; F: feldspar; Go: goethite.