Tillage however exposes the soil to all forms of degradation and
structural destruction. Soil tillage by use of heavy duty equipment
and implements, and even farm animals often result to soil
compaction, which hardens the soil and deplete the infiltration
characteristics, reduces the fertility of the soil, increase soil bulk
density and penetration resistance, and reduces yield in root crops
such as cassava, yam and sweet potato. The continuous use of soil
in tropical areas without recourse to conservation practices often
constrained the soil ecosystems beyond their natural capacity,
consequently leading to reduction in soil productivity and
sustainability (Jongruaysup et al., 2003).
Therefore, no-till in which weeds are controlled by herbicides
and crops planted directly into an untilled seedbed without any
Tillage however exposes the soil to all forms of degradation andstructural destruction. Soil tillage by use of heavy duty equipmentand implements, and even farm animals often result to soilcompaction, which hardens the soil and deplete the infiltrationcharacteristics, reduces the fertility of the soil, increase soil bulkdensity and penetration resistance, and reduces yield in root cropssuch as cassava, yam and sweet potato. The continuous use of soilin tropical areas without recourse to conservation practices oftenconstrained the soil ecosystems beyond their natural capacity,consequently leading to reduction in soil productivity andsustainability (Jongruaysup et al., 2003).Therefore, no-till in which weeds are controlled by herbicidesand crops planted directly into an untilled seedbed without any
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