soil. Thus, indicating that changes in moisture content of
soils depended on factors (e.g. temperature) other than
the treatments (Table 2). All the herbicides used for
treatment (both the recommended and 0.5x
recommended rates) in this study resulted in significant
reduction in soil bacterial population, diversity and
distribution (Figure 1).
Discussion
From the ANOVA result at 10 cm depth, the differences
on the number of viable bacterial counts by the
treatments are highly significant since the computed F
value (14.7**) is greater than the tabular F value (4.89) at
1% level of significance. Analysis of variance at 20 cm
depth also showed a high significant effect on bacterial
count. At recommended rates, maximum mean bacterial
counts were observed at the 8th week of post treatment
in the two herbicide treated soils; G1 = 1.8 x 106
cfu/ml, M1
= 2.2 x 106
cfu/ml. These counts were lower compared to
the control soil which was 2.9 x106
cfu/ml. Treatments at
x0.5 recommended rates resulted in much higher
bacterial counts compared to soils treated at
recommended rates; G2 = 2.6 x106
cfu/ml, M2 = 2.7 x
106
cfu/ml. The bacterial populations for all soil samples
dropped at week 4 of post treatment, but increased
progressively at the 6th and 8th weeks (Figure 1).
Ayansina and Oso (2006) discovered that higher
soil. Thus, indicating that changes in moisture content ofsoils depended on factors (e.g. temperature) other thanthe treatments (Table 2). All the herbicides used fortreatment (both the recommended and 0.5xrecommended rates) in this study resulted in significantreduction in soil bacterial population, diversity anddistribution (Figure 1).DiscussionFrom the ANOVA result at 10 cm depth, the differenceson the number of viable bacterial counts by thetreatments are highly significant since the computed Fvalue (14.7**) is greater than the tabular F value (4.89) at1% level of significance. Analysis of variance at 20 cmdepth also showed a high significant effect on bacterialcount. At recommended rates, maximum mean bacterialcounts were observed at the 8th week of post treatmentin the two herbicide treated soils; G1 = 1.8 x 106cfu/ml, M1= 2.2 x 106cfu/ml. These counts were lower compared tothe control soil which was 2.9 x106cfu/ml. Treatments atx0.5 recommended rates resulted in much higherbacterial counts compared to soils treated atrecommended rates; G2 = 2.6 x106cfu/ml, M2 = 2.7 x106cfu/ml. The bacterial populations for all soil samplesdropped at week 4 of post treatment, but increasedprogressively at the 6th and 8th weeks (Figure 1). Ayansina and Oso (2006) discovered that higher
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