Tell: +260 211 281013
Cell: +260 955 359727, +260 955 359728
Preliminary Results on Measuring Soil-Loss at the University of Zambia Farm,
by J.S. Lenvain, P.L. Pauwelyn and V.R.N. Chinene, Zambia Journal of Science *
Tecnology, Vol.8, no.1, September 1989,
A few years ago, the countries participating in the Southern African Development
Co-ordination Conference (SADCC) started a regional programme on soil and water
conservation. It was observed that soil-loss even on small slopes was
considerable and that this process was the starting point of an irreversible
decline in crop productivity. Zambia recently initiated some research to
understand and ultimately control water erosion. Activities currently being
undertaken include: production of an erosivity map, the preparation of a
tentative erosion hazard map, conducting field tests and an assessment of
soil-loss for land evaluation purpose.
This paper reports and evaluates a first set of results obtained from field
tests. The run-off plot technique and the universal soil-loss equation (U.S.L.E)
have been used. Movement of materials has been studied studied under four
different treatment: no vegetation, maize, sunflower and soyabean. Finally,
improvements on the technique of soil-loss and run-off harvesting are proposed.
On the bare plot, having a slop of 2.5%, soil-loss was found to be 12.7 ton/ha
per year. Under a maize cover, soil-loss was still as high as 7.8 ton/ha per
year. Therefore, it is felt that under the given circumstances, careful
management should be considered.
Keywords: Soil-loss, USLE, runoff-plot technique, erosivity, crop
factors, Oxic Paleustalf, UNZA-farm.
Click here for the full article