../images/WERU1.jpg (520546 bytes)

Wind Erosion:
An International Symposium/Workshop

wpe1.jpg (23363 bytes)   ../images/ars.jpg (19015 bytes)   ../images/weru.gif (1894 bytes)  ander3.gif (9862 bytes)


bar.bmp (45462 bytes)

Participant Information
Photograph of Participants
Breakout Sessions
Tour Reports
WERU History

../images/bar.bmp (45462 bytes)


Evaluation of Soil Losses by Wind Erosion under Different Soil and Residue Management Practices in Niger, West Africa

C. Bielders, K. Michels, and J.L. Rajot


In spite of the general recognition that wind erosion is a major land degradation process in the Sahel, little quantitative information is available for that region on soil losses by wind erosion under different management practices. An on-farm field experiment was therefore setup in order to assess the effect of two types of residue management and ridging on soil loss and millet productivity. Millet stover at a rate of 2 t ha-1 was either broadcast or placed in strips 30 cm wide. Both ridges and residue strips were oriented perpendicular to the most erosive winds. Mass balance calculations based on incoming and outgoing soil fluxes measured with BSNE sand traps indicated soil losses of at least 36.1 t ha-1 on bare plots over a two year period. Strip residue plots trapped at least 30.6 t soil ha-1 over the same period. Broadcast residue trapped 66% less sediment than banded residue. Ridging reduced soil losses by an average of 41% over two years compared to the bare control. On bare plots, millet yields declined from 328 to 78 kg grain ha-1 in two years, whereas on strip residue plots yields remained stable at around 500 kg grain ha-1. Wind erosion is a major hazard in the Sahelian zone. Millet stover mulches at a rate of 2 t ha-1 can be used effectively to prevent soil erosion.