Conservation Farming and Changing Climate: More Beneficial than Conventional Methods for Degraded Ugandan Soils
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Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
Sustainability
Abstract
The extent of land affected by degradation in Uganda ranges from 20% in relatively flat
and vegetation-covered areas to 90% in the eastern and southwestern highlands. Land degradation
has adversely affected smallholder agro-ecosystems including direct damage and loss of critical
ecosystem services such as agricultural land/soil and biodiversity. This study evaluated the extent
of bare grounds in Nakasongola, one of the districts in the Cattle Corridor of Uganda and the yield
responses of maize (Zea mays) and common bean (Phaseolus vulgaris L.) to different tillage methods in
the district. Bare ground was determined by a supervised multi-band satellite image classification
using the Maximum Likelihood Classifier (MLC). Field trials on maize and bean grain yield responses
to tillage practices used a randomized complete block design with three replications, evaluating
conventional farmer practice (CFP); permanent planting basins (PPB); and rip lines, with or without
fertilizer in maize and bean rotations. Bare ground coverage in the Nakasongola District was 187 km2
(11%) of the 1741 km2 of arable land due to extreme cases of soil compaction. All practices, whether
conventional or the newly introduced conservation farming practices in combination with fertilizer
increased bean and maize grain yields, albeit with minimal statistical significance in some cases.
The newly introduced conservation farming tillage practices increased the bean grain yield relative
to conventional practices by 41% in PPBs and 43% in rip lines. In maize, the newly introduced
conservation farming tillage practices increased the grain yield by 78% on average, relative to
conventional practices. Apparently, conservation farming tillage methods proved beneficial relative
to conventional methods on degraded soils, with the short-term benefit of increasing land productivity
leading to better harvests and food security.
Description
Keywords
Land degradation, Land management, Conservation farming
Citation
Mubiru, D. N., Namakula, J., Lwasa, J., Otim, G. A., Kashagama, J., Nakafeero, M., ... & Coyne, M. S. (2017). Conservation farming and changing climate: More beneficial than conventional methods for degraded Ugandan soils. Sustainability, 9(7), 1084. doi:10.3390/su9071084