International Scholarly Research Notices

Research Article

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

36.8^ab

31.8^b

27.1^b

30.7^a

23.0^a

16.2^a

34.5^a

25.5^a

13.2^a

39.0^a

31.3^ab

26.8^bc

HTR

75.0^d

72.5^d

65.2^d

67.8^d

64.9^d

58.6^c

71.6^d

62.6^d

55.6^c

72.4^c

63.9^d

56.0^d

53.7^c

48.5^c

40.7^c

33.0^ab

26.6^ab

22.5^a

36.8^ab

27.8^ab

19.5^a

57.1^b

49.8^c

37.6^c

DPH

29.8^a

17.9^a

13.5^a

36.9^b

33.7^b

21.2^a

40.7^b

31.7^b

18.2^a

41.2^a

28.7^a

24.0^ab

48.1^bc

38.7^b

32.1^bc

46.7^c

32.0^b

17.0^a

50.5^c

41.5^c

14.0^a

51.1^b

42.1^bc

14.7^a

SSR

—

50.8^c

47.2^c

36.6^b

54.6^c

45.6^c

33.6^b

55.2^b

45.1^c

34.3^bc

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

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.