Tillage Effects on Selected Soil Physical Properties in a Maize-Bean Intercropping System in Mwala District, Kenya
Table 3
Effect of tillage on soil surface roughness ( seasons).
Tillage
Long rains (LR 2012)
Short rains (SR 2012)
Long rains (LR 2013)
Short rains (SR 2013)
At ploughing
Before planting
3 WAP
At ploughing
Before planting
3 WAP
At ploughing
Before planting
3 WAP
At ploughing
Before planting
3 WAP
H
36.8ab
31.8b
27.1b
30.7a
23.0a
16.2a
34.5a
25.5a
13.2a
39.0a
31.3ab
26.8bc
HTR
75.0d
72.5d
65.2d
67.8d
64.9d
58.6c
71.6d
62.6d
55.6c
72.4c
63.9d
56.0d
DP
53.7c
48.5c
40.7c
33.0ab
26.6ab
22.5a
36.8ab
27.8ab
19.5a
57.1b
49.8c
37.6c
DPH
29.8a
17.9a
13.5a
36.9b
33.7b
21.2a
40.7b
31.7b
18.2a
41.2a
28.7a
24.0ab
OX
48.1bc
38.7b
32.1bc
46.7c
32.0b
17.0a
50.5c
41.5c
14.0a
51.1b
42.1bc
14.7a
SSR
—
—
—
50.8c
47.2c
36.6b
54.6c
45.6c
33.6b
55.2b
45.1c
34.3bc
Mean
48.7
41.9
35.7
44.32
37.88
28.7
48.1
39.1
25.7
52.7
43.5
32.2
LSD (5%)
12.09
7.69
10.75
5.212
6.85
8.12
5.2
5.2
8.1
9.05
12.55
11.33
CV %
9.4
6.5
7.7
4.8
6.3
7.8
4.4
5.4
8.7
4.4
3.1
5.7
Tillage: H: hand hoeing only, HTR: hand hoeing with tied ridges, DP: disc ploughing, DPH: disc ploughing + harrowing, OX: ox-ploughing, SSR: subsoiling-ripping, and (—): not measured in that season. Different letters within the columns indicate significant difference at 5% probability level.