The lack of such effect in our study may be explained by the fact that the experimental plots in ZM were highly degraded at the start of the experiments and may need relatively long time or high OM inputs before soil improvement can be detected.
The lack of such effect in our study maybe explained by the fact that the experimental plots in ZM werehighly degraded at the start of the experiments and may need relativelylong time or high OM inputs before soil improvement canbe detected.