Table 1. Selected characteristics of the dominant soils in MLRA 131 that relate to water and solute transport.
Great group		Approximate	Drainage		Slope	Hydrologic
/Series	Family	Area	Class	Permeability	Range	Group
		acres			%
Haplaquepts
Perry	Very-fine, montmorillonite, nonacid, thermic Vertic	995,066	poor	very slow	0 - 3	D
Portland	Very-fine, mixed, nonacid, thermic Vertic	296,158	somewhat poor	very slow	0 - 3	D
Sharkey	Very-fine, montmorillonitic, nonacid, thermic Vertic	4,663,454	poor	very slow	0 - 5	D
Tunica	Clayey over loamy, montmorillonitic, nonacid, thermic Vertic	432,227	poor	very slow	0 - 5	D
Dystraquerts
Alligator	Very-fine, montmorillonitic, thermic Alic	1,308,099	poor	very slow	0 - 5	D
Hapludolls
Desha	Very-fine, montmorillonitic, thermic Vertic	121,295	somewhat poor	very slow	0 - 3	D
Bowdre	Clayey over loamy, montmorillonitic, thermic Fluvaquentic	137,464	somewhat poor	slow	0 - 8	C
Moreland	Fine, mixed, thermic Vertic	556,828	somewhat poor	very slow	0 - 3	D
Hapludalfs
Dubbs	Fine-silty, mixed, thermic Typic	355,409	well	moderate	0 - 8	B
Bosket	Fine-loamy, mixed, thermic Typic	236,572	well	moderate	0 - 14	B
Rilla	Fine-silty, mixed, thermic Typic	367,876	well	moderate	0 - 5	B
Hydroquents
Barbary	Very-fine, montmorillonitic, nonacid, thermic Typic	357,694	very poor	very slow	0 - 1	D
Fluvaquents
Commerce	Fine-silty, mixed, nonacid, thermic Aeric	1,318,265	somewhat poor	moderately slow	0 - 5	C
Mhoon	Fine-silty, mixed, nonacid, thermic Typic	134,160	poor	slow	0 - 5	D
Convent	Coarse-silty, mixed, nonacid, thermic Aeric	259,246	somewhat poor	moderate	0 - 3	C
Fausse	Very-fine, montmorillonitic, nonacid, thermic Typic	551,057	very poor	very slow	0 - 1	D
Natraqualfs
Foley	Fine-silty, mixed, thermic Albic Glossic	214,546	poor	very slow	0 - 3	D
Endoaqualfs
Amagon	Fine-silty, mixed, thermic Typic	274,282	poor	slow	0 - 3	D
Dundee	Fine-silty, mixed, thermic Typic	1,153,618	somewhat poor	moderately slow	0 - 8	C
Forestdale	Fine, montmorillonitic, thermic Typic	615,774	poor	very slow	0 - 8	D
Ochraqualfs
Hebert	Fine-silty, mixed, thermic Aeric	391,261	somewhat poor	moderately slow	0 - 5	C
Tensas	Fine, montmorillonitic, thermic Aeric	318,343	somewhat  poor	very slow	0 - 8	D
Epiaqualfs
Jackport	Very-fine, montmorillonitic, themic Chromic Vertic	223,142	poor	very slow	0 - 3	D
Glossaqualfs
Calhoun	Fine-silty, mixed, thermic Typic	210,779	poor	slow	0 - 1	D
Udifluvents
Robinsonville	Coarse-loamy, mixed, nonacid, thermic Typic	153,551	well	moderate/ rapid	0 - 5	B

 

Table 2. Selected physical and chemical properties of the two soils used in the sorption study of Goetz (1990).
Soil series	pH	Sand	Silt	Clay	O.M.	CEC
		---------- % ----------			%	meq/100g
Sharkey	6.7	9	40	51	2.4	38.3
Gallion	5.6	33	56	11	1.4	5.9

 

Table 3. Selected physical and chemical properties of the soils used in the sorption study of Johnson (1989).
Soil Series	County	Sand	Silt	Clay	pH	CEC	Total C
		----------- % -----------				meq/100 g	%
Beulah	Crittenden	89.7	7.7	2.6	5.7	3.2	0.15
Roxana	Crawford	32.1	55.8	12.1	6.4	6.8	0.34
Bosket	Jackson	77.5	16.6	5.9	6.2	3.6	0.44
Commerce	Crittenden	43	44.2	12.8	5.7	10.4	0.55
Herbert	Desha	34.9	51.1	14	5.8	8.4	0.66
Forestdale	Crittenden	54.5	23.3	22.2	5.8	20.8	0.78
Dundee	Crittenden	24.6	65.9	9.5	6.6	7.2	0.96
Dubbs	Crittenden	23.4	66.6	10	4.5	12.8	0.98
Sharkey	Mississippi	9.3	37.3	53.4	7.1	37.2	1.28
Sharkey	Crittenden	6.1	28.8	65.1	4	43.2	1.88
Sharkey	Crittenden	5.6	55.9	38.5	5.1	25.6	1.89
Sharkey	Desha	1.4	35.1	63.5	7.2	50	1.96
Sharkey	Crittenden	3.7	23.1	73.2	6.6	55.2	2.08
Sharkey	Crittenden	14.9	28.8	46.3	6.7	34.8	2.31

 

Table 4. Sorption distribution coefficients (Kd) for three herbicides as a function of soil in MLRA 131. The results are those of Johnson (1989).
Soil series	Metribuzin	Fluometuron	Imazaquin
Beulah	0.25	0.15	0.04
Roxana	0.28	0.72	0.18
Bosket	0.31	0.76	0.15
Commerce	0.41	0.93	0.38
Herbert	0.46	0.87	0.32
Forestdale	0.86	1.9	0.54
Dundee	0.45	0.73	0.28
Dubbs	1.2	3.1	1.1
Sharkey	1.2	2.7	0.28
Sharkey	2.7	3.8	6
Sharkey	1.6	3	1.1
Sharkey	1.1	2.6	0.46
Sharkey	1.8	3.6	0.68
Sharkey	1.7	3.6	0.49

 

Table 5. Selected physical and chemical properties of the soils used in the sorption study of Strebe (1995).
	Soil	Depth	Textural	Organic
State	series	Interval	Class	Carbon	Kd	Koc
		cm		%
Arkansas
	Bosket	0 - 15	loam	0.59	0.42	72
Louisiana
	Mhoon	0 - 15	silty clay loam	1.4	0.69	48.6
		30 - 46	clay loam	0.65	0.48	73.7
Mississippi
	Dundee	0 - 15	silty clay loam	0.88	0.28	31.5
		30 - 46	silt loam	0.47	0.5	106.4

 

Table 6. General information and morphological description of the Dundee soil at the bromide transport site (H.D. Scott, unpublished data).
Site location:	University of Arkansas Agricultural Experiment Station at Clarkedale, Arkansas
Coordinates:	750271E, 3913209N or 90o 14'47''W, 35o 19'57''N
Position:	Flood plain protected by a levee.
Slope:	level to nearly level, 0 - 1%
Classification:	fine-silty, mixed, thermic Aeric Endoaqualf
Profile description:
Horizon	Depth	Description
	cm
Ap1	0 - 11	Dark brown (10YR 3/3) silt loam, few fine distinct strong brown (7.5YR 5/6) mottles; weak very fine subangular blocky structure; very friable; few fine Fe-Mn concretions; few fine discontinuous pores; few fine roots; abrupt boundary.
Ap2	11-21	Dark brown (10YR 3/3) silt loam; few fine distinct strong brown (7.5YR 5/6) mottles; weak medium subangular blocky parting to weak medium platy structure; firm and compact; very few white (10YR 8/1) skeletans on ped surfaces and on vertical platy surfaces; few fine Fe-Mn concretions; few fine discontinuous pores; clear smooth boundary.
BEg1	21-30	Dark grayish brown (10YR 4/2) silt loam; common medium faint gray (10YR 5/1) and few fine distinct strong brown (7.5YR 4/6) mottles; moderate fine subangular blocky structure; friable; few white (10YR 8/1) skeletans on ped surfaces; common fine Fe-Mn concretions, few red (2.5YR 4/6) soft Fe masses, and red (2.5YR 4/6) linings around some pores; few fine and few very fine discontinuous pores; clear smooth boundary.
BEg2	30-52	Mottled dark grayish brown (10YR 4/2) and brown to dark brown (7.5YR 4/3) silt loam; few fine prominent yellowish red (5YR 4/6) mottles; few fine Fe-Mn concretions; few distinct dark brown (10YR 3/3) masses from horizon above; common fine and common medium continuous pores; gradual smooth boundary.
BEg3	52-78	Dark grayish brown (10YR 4/2) silt loam; many fine distinct strong brown (7.5YR 4/6) mottles; weak very fine subangular blocky structure; friable; common fine Fe-Mn concretions; common fine and common medium continuous pores; clear smooth boundary.
Btg	78-104	Dark gray (10YR 4/1) silty clay loam; common fine distinct brown to dark brown (7.5YR 4/4), few fine prominent yellowish red (5YR 4/6) and few fine faint gray (10YR 5/1) mottles; weak fine subangular blocky structure; firm; few faint clay films on ped surfaces; common fine Fe-Mn concretions and few brown to dark brown (7.5 YR 4/4) soft Fe masses; many very fine and common fine continuous pores; clear smooth boundary.

 

Table 7. Selected properties of the Dundee profile at Clarkedale, Arkansas.
Depth	Particle size			Dry bulk	Geometric		Organic
Interval	Sand	Silt	Clay	Density	Mean Ksat	pH	Carbon
cm	------------------%--------------------			Mg m-3	cm h-1
00 - 5	10.9	76.9	12.2	1.26	0.225	5.3	0.80
10 - 15	9.3	76	14.7	1.52	0.050	5.3	0.63
20 - 25	9.3	78.1	12.6	1.56	0.021	5.4	0.52
30 - 35	7.2	74.7	18.1	1.63	0.033	5.0	0.41
40 - 45	13.5	70.2	16.3	1.44	0.058	5.1	0.30
50 - 55	13.6	66	20.4	1.40	0.274	5.3	0.33
60 - 65	24.2	61.9	13.9	1.34	1.829	5.7	0.25
70 - 75	9.3	75	15.7	1.38	0.594	5.9	0.24
80 - 85	2.1	63.8	34.1	1.35	0.023	5.7	0.35
90 - 95	1.8	66.4	31.8	1.38	0.040	5.8	0.32

Table 8. Brief description of the Sharkey soil at the Arkansas study site.
Taxonomic class:	very fine, smectitic, thermic Typic Epiaquert
Location:	Northeast Research and Extension Center at Keiser, Arkansas.
Horizon	Depth	Description of textural class and structure
Ap1	0-10	silt loam; moderate fine subangular blocky
Ap2	10-15	silt loam; moderate medium platy parting to moderate medium angular blocky
Bg1	15-35	silty clay; weak medium platy parting to moderate coarse angular blocky
Bg2	35-71	clay; weak medium angular blocky
Bgss1	71-117	clay; moderate fine angular blocky
Bgss2	117-152+	clay; weak medium angular blocky

 

Table 9. Selected physical and chemical properties of the Sharkey profile near Keiser, Arkansas (H. D. Scott, unpublished data).
Depth	Particle Size			Dry Bulk	Geometric		Organic
Interval	Sand	Silt	Clay	Density	Mean Ksat	pH	Carbon
cm	------ %--------			Mg m-3	cm h-1		%
0 - 10	20.4	57.9	21.7	1.42	0	6	1.41
10 - 20	20.2	59.1	20.7	1.69	0	6.3	0.93
20 - 30	8.9	46	45.1	1.59	0	6.3	1.37
30 - 40	11.7	44.8	43.6	1.37	0	6.7	0.97
40 - 50	10.9	43.6	45.5	1.35	0	5.6	1.07
50 - 60	6.8	39.9	53.4	1.37	0	6.5	0.99
60 - 70	13.3	40	46.7	1.36	0	6.6	1.24
70 - 80	13.7	40.6	45.7	1.34	0	6.7	1.06
80 - 90	12.8	37.1	50.1	1.37	0	6.5	0.88
90 - 100	5.6	38.3	56.1	1.42	0	6.7	0

 

Table 10. Description of the Sharkey soil at the Louisiana study site.
Site	Profile 95
Horizon	Depth (cm)	Description
Ap	0 - 7	Very dark grayish-brown clay; strong fine and medium granular structure
A1	7 - 17	Dark gray clay with many fine, distinct, dark yellowish-brown mottles, medium and fine angular blocky structure; plastic, smooth boundary
C1	31- 42	Gray clay with many fine distinct dark brown and very dark grayish-brown mottles; fine and medium angular blocky structure
C2	42-60	Gray clay; brown mottles; sub-angular blocky structure; plastic; mildly alkaline

 

Table 11. The description of the Olivier soil profile at the Louisiana site (data of H. M. Selim).
Horizon	Depth (cm)	Description
Ap	0 - 10	Grayish-brown silt loam, weak, medium, granular structure.
A2	10 - 25	Light grayish-brown silt loam with weak, medium subangular blocky structure
B2t	25 - 40	Yellowish-brown, heavy silt loam, moderate, medium subangular blocky structure
Bx2	40 - 58	Yellowish-brown, heavy silt loam with common fine distinct grayish-brown and gay silt seams (discontinuous); moderate, coarse, prismatic and blocky structure.
Bx3	58 - 98	Yellowish-brown, medium silt with common fine distinct grayish-brown, gray silt seams, moderate, coarse prismatic blocky structure; diffuse wavy boundary.
B3	98 - 150	Weak, coarse prismatic structure, gray clay veins between prisms.

 

Table 12. Soil Characteristics of the Olivier soil series.
			----- Sand Size Fractions (%) -----
		Depth	2 - 1	1-.5	.5-.25	.25-.125	.125-.05	Sand	Silt	Clay2	Bd1	Ksat1
Plot	Horizon	cm	mm	mm	mm	mm	mm	%	%	%	g cm-3	m h-1
OILA-
1,2,3	Ap	0-10	4.5	6.0	8.0	9.0	12.0	39	58	3	1.32	0.248
	A2	10-25	1.5	1.7	1.8	2.5	7.0	14	72	14	1.39	0.174
	B2t	25-41	1.0	1.0	2.0	2.3	6.7	13	72	15	1.44	0.231
	Bx2	41-58	0.5	0.2	0.5	1.5	5.8	9	61	30	1.43	0.140
	Bx3	58-97	0.7	0.8	0.5	0.8	3.4	6	63	31	1.50	0.002
	B3	97-160	0.0	0.0	0.0	0.0	1.0	1	74	25	1.51	0.036
1Bd = Bulk Density; Ksat = Saturated Hydraulic Conductivity.
2 The lower-than-expected clay content of horizon B2t suggests that the profiles were Taxadjuncts to the Olivier series.

 

Table 13. Statistical properties of measured soil parameters along an 80 m transect of an Olivier soil.
Parameter	Mean	Variance	CV	Skewness	Kurtosis	Sample Size
			%
Sat. Hydraulic Conductivity
Ksat (cm day-1 )	7.3	54.24	100.7	2.52	8.34	280
Sand (%)	9.59	7.63	28.8	-0.06	1.05	281
Silt (%)	81.73	11.15	4.1	-0.26	0.84	281
Clay (%)	8.68	7.06	30.6	0.91	0.37	281
Water Content (cm3 cm-3)
at saturation	0.54	0.0022	8.7	0.97	1.10	268
at 0.005 MPa	0.49	0.0017	8.4	1.76	5.14	269
at 0.01 MPa	0.47	0.0015	8.3	1.02	5.61	268
at 0.03 MPa	0.43	0.0017	9.6	-0.39	4.00	268
at 0.10 MPa	0.27	0.0023	17.7	1.23	2.73	264
at 1.5 MPa	0.14	0.0086	20.5	1.97	4.30	262
Field Capacity (cm3 cm-3)	0.43	0.0013	8.4	-0.59	0.32	262
Bulk Density (Mg m-3)	1.35	0.0032	4.2	-0.78	1.02	280

 

Table 14. Statistical properties of soil mechanical impedance with soil depth for Olivier soil (data of H. M. Selim).
Horizon	Depth	Mean1	Maximum	Minimum	Variance	C.V.	K-S2	Sample size
	(cm)	------------(MPa)------------				(%)
Ap	0-17	3.23a	5.24	1.1	0.54	22.7	NN	250
B/E	17-30	3.38a	5.52	0.97	0.9	28.1	N	250
Btx1	30-45	2.95b	5.79	0.1	1.35	39.5	NN	249
Btx2	45-60	2.89b	5.79	0.83	0.97	34.1	NN	248
Btx2	60-75	3.25a	5.93	1.24	1.12	32.6	N	243
Btx3	75-92	4.00c	6.21	0.69	1.59	31.6	NN	235
1Mean mechanical impedances are significantly different for different horizons unless followed by the same letter.
2K-S=Kolmogorov-Smirnov D test for normality. NN=not normal; N=normal

 

Table 15. Statistical properties of soil moisture content and soil bulk density with depth (data of H. M. Selim).
Parameter	Depth	Range	Mean	S. D.	C.V.	K-S1	Sample Size
	(cm)				(%)
Water	0 -15	0.06	0.14	0.011	8.5	NN	66
content	15 - 30	0.15	0.21	0.027	13.0	N	66
(cm3 cm-3 )	30 - 45	0.03	0.27	0.006	2.3	NN	66
	45 - 60	0.03	0.27	0.007	2.5	N	65
	60 - 75	0.28	0.28	0.006	2.2	N	66
	75 - 90	0.02	0.28	0.005	0.8	N	65
Bulk	0 - 15	0.69	1.54	0.11	7.6	N	33
density	15 - 30	0.59	1.63	0.12	7.3	N	34
(Mg m-3 )	30 - 45	0.53	1.61	0.11	6.9	N	34
	45 - 60	0.63	1.64	0.12	7.6	N	34
	60 - 75	0.50	1.70	0.12	7.4	N	34
	75 - 90	0.60	1.74	0.10	5.8	N	34
1K-S=Kolmogorov-Smirnov D test for normality. NN=not normal; N=normal