This greenhouse research was carried out to study
the effects of water and tillage erosion on agricultural productivity
and soil quality in soil samples from a semiarid region of Iran.
A factorial experiment of complete randomized block design was
used to compare the effects of soil erosion (eroded and non-eroded
soils), slope position, water stress and fertilizer (N-P-K) on yield
and yield components of wheat as soil productivity index. The
results showed that erosion ie water and tillage erosion has a significant
effect (p<0.01) in decreasing soil productivity due to its
negative impact on soil organic matter, nutrients (N and K) and
hydraulic conductivity. Complete N-P-K fertilization and water
stress had significant effects on increasing and decreasing of wheat
yield, respectively. The effect of water stress in particular was so
high that it could eclipse the erosion impact on yield reduction.
Wheat dry matter and grain mass on foot and mid slopes were
significantly higher than that on upslope positions where total N
and available K were the lowest and equivalent calcium carbonate
the highest. Saturated hydraulic conductivity and total nitrogen
were found to be the most important soil properties as far as their
correlations to wheat yield are concerned.
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