Soil Degradation-Induced Decline in Productivity of Sub-Saharan African Soils: The Prospects of Looking Downwards the Lowlands with the Sawah EcotechnologyReport as inadecuate




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Applied and Environmental Soil ScienceVolume 2012 2012, Article ID 673926, 10 pages

Review Article

School of Agriculture, Kinki University, Nara 631-8505, Japan

Department of Soil Science, University of Nigeria, Nsukka 410001, Nigeria

CSIR—Soil Research Institute, Academy Post Office, Kwadaso, Kumasi, Ghana

Department of Crop Production Technology, Federal College of Agriculture, P.M.B. 7008, Ishiagu, Nigeria

Department of Soil Science, Faculty of Agriculture, Andalas University, Limau Manis, Padang 25163, Indonesia

Received 4 November 2011; Revised 13 January 2012; Accepted 16 January 2012

Academic Editor: Rosario García Moreno

Copyright © 2012 Sunday E. Obalum et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The paper provides an insight into the problem of land degradation in Sub-Saharan Africa, with emphasis on soil erosion and its effect on soil quality and productivity, and proposes a lowland-based rice-production technology for coping with the situation. Crop yields are, in addition to the degree of past and current erosion, determined by a number of interacting variables. This, coupled with the generally weak database on erosion-induced losses in crop yield in spite of the region’s high vulnerability to erosion, makes it difficult to attain a reliable inference on the cause-effect relationship between soil loss and productivity. Available data suggest, however, that the region is at risk of not meeting up with the challenges of agriculture in this 21st century. Based on the few studies reviewed, methodology appears to have an overwhelming influence on the erosion-productivity response, whereas issues bordering on physical environment and soil affect the shape of the response curve. We argue that the sawah ecotechnology has the potential of countering the negative agronomic and environmental impacts of land degradation in Sub-Saharan Africa. This is a farmer-oriented, low-cost system of managing soil, water, and nutrient resources for enhancing lowland rice productivity and realizing Green Revolution in the region.





Author: Sunday E. Obalum, Mohammed M. Buri, John C. Nwite,  Hermansah, Yoshinori Watanabe, Charles A. Igwe, and Toshiyuki Wakatsuki

Source: https://www.hindawi.com/



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