Providing evidence to improve practice

Individual study: Soil erosion on Alfisols in Western Nigeria, I. Effects of slope, crop rotation and residue management

Published source details

Lal R. (1976) Soil erosion on Alfisols in Western Nigeria, I. Effects of slope, crop rotation and residue management. Geoderma, 16, 363-375


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Change tillage practices Soil Fertility

A replicated experiment in 1970-1974 on sandy-clay to clay soil in Nigeria (Lal, 1976) found lower runoff under no-till maize Zea mays-cowpea Vigna unguiculata treatments (2% of total annual rainfall) compared to conventionally ploughed bare fallow (36%). Soil loss was lower under no-till (0.1 t/ha) compared to conventionally ploughed continuous maize (41 t/ha), cowpea-maize (43 t/ha) and bare fallow (230 t/ha) treatments. Slopes of 1, 5, 10 and 15% received the following treatments: bare fallow (conventionally ploughed); continuous maize (conventionally ploughed, mulched); continuous maize (conventionally ploughed, no mulch); maize-cowpea rotation (zero-tillage); and cowpeas-maize rotation (conventionally ploughed). Plots were 25 x 4 m and were replicated five times on each slope. Soil and runoff water was collected from each plot after every rainstorm using a water collection system below ground level downslope of the plots.

 

Add mulch to crops Soil Fertility

A replicated experiment in 1970-1974 on sandy-clay to clay soil in Nigeria (Lal, 1976) found that mulched continuous maize Zea mays after ploughing had the lowest soil loss (0 t/ha) compared to continuous maize without mulch (41 t/ha) and bare fallow plots (230 t/ha). Runoff was also lower in the mulched treatment (2% of total annual rainfall) compared to bare fallow (36%). Slopes of 1, 5, 10 and 15% received the following treatments: bare fallow (conventionally ploughed); continuous maize (conventionally ploughed, mulched); continuous maize (conventionally ploughed, no mulch); maize-cowpea Vigna unguiculata rotation (zero-tillage); and cowpeas-maize rotation (conventionally ploughed). Plots were 25 x 4 m and were replicated five times on each slope. Soil and runoff water was collected from each plot after every rainstorm using a water collection system below ground level downslope of the plots.