International Scholarly Research Notices

Research Article

Tillage Effects on Selected Soil Physical Properties in a Maize-Bean Intercropping System in Mwala District, Kenya

Table 4

Soil crust strength as influenced by time of measurement, tillage practices, and the cropping systems ( seasons).


Soil crust strength (MPa)
	Short rains 2012				Long rains 2013				Short rains 2013
	3 WAP	7 WAP	10 WAP	15 WAP	4 WAP	6 WAP	10 WAP	16 WAP	4 WAP	8 WAP	12 WAP	17 WAP

Tillage
H	1.034^a	1.001	1.272	1.269	1.187^a	1.553	1.574	1.469	1.187^a	1.350	1.468	0.747^ab
HTR	0.905^b	1.007	1.088	1.124	1.133^a	1.494	1.680	1.526	1.133^b	1.282	1.462	0.672^c
DP	1.111^a	1.055	1.208	1.193	1.188^a	1.475	1.708	1.472	1.188^a	1.341	1.415	0.728^bc
DPH	1.094^a	1.023	1.255	1.217	1.136^a	1.460	1.671	1.451	1.136^b	1.301	1.417	0.769^ab
OX	1.136^a	1.025	1.256	1.234	1.175^a	1.561	1.673	1.478	1.175^ab	1.355	1.453	0.807^a
SSR	1.111^a	1.067	1.230	1.296	1.209^a	1.568	1.705	1.519	1.209^a	1.357	1.480	0.815^a
LSD 5%	0.111	0.106	0.162	0.088	0.047	0.105	0.108	0.069	0.047	0.067	0.053	0.072
Cropping system
Sole bean	1.026	1.032	1.221	1.241	1.177	1.529	1.617^b	1.479	1.177	1.314	1.441	0.756
Sole maize	1.086	1.006	1.208	1.204	1.161	1.530	1.713^a	1.482	1.161	1.338	1.462	0.749
Intercrop	1.085	1.051	1.225	1.222	1.176	1.496	1.675^a	1.496	1.176	1.340	1.445	0.765
LSD 5%	0.072	0.064	0.052	0.036	0.051	0.046	0.047	0.036	0.051	0.041	0.029	0.048
Significance levels
Tillage	0.005	0.741	0.218	0.012	0.018	0.165	0.160	0.193	0.018	0.129	0.085	0.007
Cropping system	0.171	0.369	0.794	0.131	0.773	0.245	<0.001	0.571	0.773	0.374	0.272	0.798
Tillage × cropping system	0.466	0.493	0.406	0.043	0.672	0.151	0.789	0.576	0.672	0.266	0.278	0.935
CV%	3.2	6.9	5.2	4.2	1.6	5.0	1.7	2.8	1.6	1.5	0.9	10.2

Tillage: H: hand hoeing only, HTR: hand hoeing with tied ridges, DP: disc ploughing, DPH: disc ploughing + harrowing, OX: ox-ploughing, and SSR: subsoiling-ripping.
Different letters within the columns indicate significant difference at 5% probability level.