|
Table
1. Representative soil particle size distribution
of major horizons before plot
construction.
|
|
Depth
|
Sand
|
Silt
|
Clay
|
Texture
|
|
inches
|
-----------------%-----------------
|
|
0-10
|
10.4
|
25.7
|
63.9
|
clay
|
|
10-24
|
20.1
|
27.0
|
52.9
|
clay
|
|
24-53
|
9.2
|
34.6
|
56.2
|
clay
|
|
53-75
|
13.4
|
40.1
|
46.5
|
silty
clay
|
|
75-120
|
63.0
|
25.3
|
11.7
|
sandy
loam
|
|
Table
2. Representative chemical properties of major
horizons before plot construction.
|
|
Depth
|
pH
|
Organic
Matter
|
Exchangeable
Cations
|
Base
Sat.
|
|
Ca
|
Mg
|
K
|
Na
|
H+
|
Total
|
|---|
|
inches
|
|
%
|
---------cmolckg-1
|
%
|
|
0-10
|
4.7
|
2.46
|
14.41
|
6.97
|
0.63
|
0.23
|
14.23
|
36.47
|
60.98
|
|
10-24
|
4.9
|
0.67
|
16.65
|
11.66
|
0.59
|
1.07
|
7.32
|
37.29
|
80.37
|
|
24-53
|
6.8
|
0.27
|
26.17
|
18.09
|
0.52
|
3.52
|
2.24
|
50.54
|
95.57
|
|
53-75
|
7.7
|
0.12
|
14.33
|
7.17
|
0.32
|
1.02
|
1.56
|
24.40
|
93.61
|
|
75-120
|
7.8
|
0.10
|
10.82
|
3.52
|
0.27
|
0.29
|
0.87
|
15.77
|
94.50
|
|
Table
3. Representative particle size distribution of
surface horizons (0 to 6 inches) of constructed
subplots January 1981.
|
|
Treatment
|
Sand
|
Silt
|
Clay
|
Texture
|
|
|
-----%-----
|
|
|
T1
|
12.2
|
28.1
|
59.7
|
clay
|
|
T2
|
13.7
|
28.2
|
58.1
|
clay
|
|
T3
|
13.3
|
28.7
|
58.0
|
clay
|
|
T4
|
62.4
|
20.4
|
17.2
|
sandy
loam
|
|
T5
|
20.3
|
31.5
|
48.2
|
clay
|
|
Control
|
9.1
|
27.9
|
63.0
|
clay
|
|
Table
4. Representative chemical properties of surface
horizons (0 to 6 inches) of constructed subplots,
January 1981, before liming and
fertilization.
|
|
Treatment
|
pH
|
Organic
Matter
|
Exchangeable
Cations
|
Base
Sat.
|
|
Ca
|
Mg
|
K
|
Na
|
H+
|
Total
|
|---|
|
|
|
%
|
---------------cmolckg-1--------------
|
%
|
|
T1
|
5.1
|
1.6
|
16.17
|
9.51
|
0.67
|
0.50
|
13.69
|
40.54
|
66
|
|
T2
|
5.5
|
1.7
|
19.96
|
8.76
|
0.63
|
0.42
|
12.98
|
42.75
|
69
|
|
T3
|
5.9
|
1.2
|
22.77
|
10.43
|
0.66
|
0.64
|
9.81
|
44.31
|
78
|
|
T4
|
8.1
|
0.1
|
16.74
|
8.11
|
0.31
|
0.49
|
0.68
|
26.33
|
97
|
|
T5
|
5.4
|
0.6
|
13.33
|
11.35
|
0.62
|
0.75
|
9.23
|
35.28
|
74
|
|
Control
|
5.5
|
2.8
|
17.09
|
7.23
|
0.68
|
0.24
|
12.25
|
37.49
|
67
|
|
Table
5. Soil bulk density of the surface horizon (0 to 6
inches) for 3 years after plot
construction.
|
|
Treatment
|
Years
After Construction
|
|
1
|
2
|
3
|
|---|
|
|
----------mg/m3----------
|
|
T1
|
1.10
|
1.15
|
1.32
|
|
T2
|
1.20
|
1.17
|
1.24
|
|
T3
|
1.15
|
1.15
|
1.35
|
|
T4
|
1.29
|
1.24
|
1.43
|
|
T5
|
1.23
|
1.29
|
1.43
|
|
Control
|
1.13
|
1.20
|
1.28
|
|
Table
6. Mean soybean yields and statistical
relationships for soil-handling treatments, 1981
season.
|
|
Treatment
|
Mean
Yields (bu/A)
|
|
T1
|
32.1a
|
|
T2
|
33.8
a
|
|
T3
|
34.8a
|
|
T4
|
38.6a
|
|
T5
|
33.9a
|
|
Control
|
17.5b
|
|
Means
not having a letter in common differ significantly
at the 5% (P=0.05) level according to the Least
Significance Difference Criterion.
|
|
Table
7. Mean soybean yields of flat and hipped
treatments and statistical relationships, 1981
season.
|
|
Land
Preparation Method
|
Mean
Yields (bu/A)
|
|
Flat
|
33.4
a
|
|
Hipped
|
30.2a
|
|
Means
not having a letter in common differ significantly
at the 5% (P=0.05) level according to the Least
Significance Difference Criterion.
|
|
Table
8. Mean soybean yields and statistical
relationships for soil-handling treatments, 1982
season.
|
|
Treatment
|
Mean
Yields (bu/A)
|
|
T1
|
41.2a
|
|
T2
|
39.8a
|
|
T3
|
41.0a
|
|
T4
|
40.2a
|
|
T5
|
43.2a
|
|
Control
|
34.9b
|
|
Means
not having a letter in common differ significantly
at the 5% (P=0.05) level according to the Least
Significance Difference Criterion.
|
|
Table
9. Mean soybean yields of flat and hipped
treatments and statistical relationships, 1982
season.
|
|
Land
Preparation Method
|
Mean
Yields (bu/A)
|
|
Flat
|
40.8a
|
|
Hipped
|
39.3a
|
|
Means
not having a letter in common differ significantly
at the 5% (P=0.05) level according to the Least
Significance Difference Criterion.
|
|
Table
10. Mean soybean yields and statistical
relationships for soil-handling treatments, 1983
season.
|
|
Treatment
|
Mean
Yields (bu/A)
|
|
T1
|
18.1a
|
|
T2
|
17.5a
|
|
T3
|
17.4a
|
|
T4
|
19.9a
|
|
T5
|
18.2a
|
|
Control
|
8.0b
|
|
Means
not having a letter in common differ significantly
at the 5% (P=0.05) level according to the Least
Significance Difference Criterion.
|
|
Table
11. Mean soybean yields of flat and hipped
treatments and statistical relationships, 1983
season.
|
|
Land
Preparation Method
|
Mean
Yields (bu/A
|
|
Flat
|
16.9a
|
|
Hipped
|
16.1a
|
|
Means
not having a letter in common differ significantly
at the 5% (P=0.05) level according to the Least
Significance Difference Criterion.
|
|
Table
12. Mean soybean yields for the 3-year study and
the statistical relationships.
|
|
Treatment
|
Yields
|
Std.
Dev. Of the Mean
|
|
|
bu/A
|
|
|
T1
|
30.4a
|
0.91
|
|
T2
|
30.3a
|
0.91
|
|
T3
|
31.1a
|
0.94
|
|
T4
|
33.0a
|
1.00
|
|
T5
|
31.7a
|
0.94
|
|
Control
|
20.1b
|
0.91
|
|
Means
not having a letter in common differ significantly
at the 5% (P=0.05) level according to the Least
Significance Difference Criterion.
|
|
Table
13. Mean soybean yields of flat and hipped land
preparation treatments for the 3-year
study.
|
|
Treatment
|
Yield
|
Std.
Dev. Of the Mean
|
|
|
bu/A
|
|
|
Flat
|
30.9
|
0.95
|
|
Hipped
|
28.5
|
1.01
|
|
Means
not having a letter in common differ significantly
at the 5% (P=0.05) level according to the Least
Significance Difference Criterion.
|
|