Landscape positions dictating crop fertilizer responses in wheat-based farming systems of East African Highlands
Improving fertilizer use efficiency has remained a challenge, particularly for small-scale farming in undulating ‘abnormal’ landscapes of East Africa. Milne's 1930s concept on ‘Catena’ was considered as a breakthrough in understanding soil variability and its implication on productivity in East Afri...
| Autores principales: | , , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Cambridge University Press
2022
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/107008 |
| _version_ | 1855534904336449536 |
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| author | Amede, Tilahun Gashaw, Tadesse Legesse, Gizachew Tamene, Lulseged D. Mekonen, Kindu Thorne, Peter J. Schulz, Steffen |
| author_browse | Amede, Tilahun Gashaw, Tadesse Legesse, Gizachew Mekonen, Kindu Schulz, Steffen Tamene, Lulseged D. Thorne, Peter J. |
| author_facet | Amede, Tilahun Gashaw, Tadesse Legesse, Gizachew Tamene, Lulseged D. Mekonen, Kindu Thorne, Peter J. Schulz, Steffen |
| author_sort | Amede, Tilahun |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Improving fertilizer use efficiency has remained a challenge, particularly for small-scale farming in undulating ‘abnormal’ landscapes of East Africa. Milne's 1930s concept on ‘Catena’ was considered as a breakthrough in understanding soil variability and its implication on productivity in East African highlands. However, there is limited information on how the ‘Catena’ features could be used for fine tuning fertilizer recommendations. We initiated multiple on-farm replicated experiments in three wheat-growing districts (Endamohoni, Lemo and Worreilu) in the Ethiopian highlands in 2014, 2015 and 2016 to assess landscape positions affecting crop-nutrient responses, identify yield limiting nutrients across the ‘Catena’ (N, P, K, S and Zn) and quantify effects of landscape positions on resources use efficiency. We clustered farmlands across the ‘Catena’ (Hillslopes, Midslopes and Footslopes) based on land scape positions in the respective locations. Wheat yield was more strongly and significantly affected by landscape positions (P < 0.001) than by nutrient sources or rates. The crop response to fertilizers was 50 to 300% higher in foot slopes than in hillslopes, depending on locations and inputs levels. With increasing slope, there was a decrease in a crop fertilizer response due to a significant decrease in soil organic carbon, clay content and soil water content, with r2 of 0.95, 0.86 and 0.96, respectively. The difference in the crop response between landscape positions was significantly higher (P < 0.05) with higher rates of nutrient applications (>N92 P46) while differences between landscape positions diminish at lower rates. Yield benefits due to application of K was significant only in the dry years (P < 0.05), while there was hardly any yield benefit from the application of zinc and sulfur. The crop nitrogen recovery fraction and crop water productivity decreased with an increasing slope regardless of nutrient combinations. The results indicated that the landscape position could be considered as a proxy indicator for targeted fertilizer application, particularly in farms with undulating topographic features. Hillslopes are better served by the application of organic fertilizers along with conservation measures as applying higher rates of mineral fertilizer in hillslopes would rather increase the risk of downstream nutrient movement. |
| format | Journal Article |
| id | CGSpace107008 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Cambridge University Press |
| publisherStr | Cambridge University Press |
| record_format | dspace |
| spelling | CGSpace1070082025-11-12T06:51:15Z Landscape positions dictating crop fertilizer responses in wheat-based farming systems of East African Highlands Amede, Tilahun Gashaw, Tadesse Legesse, Gizachew Tamene, Lulseged D. Mekonen, Kindu Thorne, Peter J. Schulz, Steffen landscape wheat efficiency levels paisaje trigo eficacia Improving fertilizer use efficiency has remained a challenge, particularly for small-scale farming in undulating ‘abnormal’ landscapes of East Africa. Milne's 1930s concept on ‘Catena’ was considered as a breakthrough in understanding soil variability and its implication on productivity in East African highlands. However, there is limited information on how the ‘Catena’ features could be used for fine tuning fertilizer recommendations. We initiated multiple on-farm replicated experiments in three wheat-growing districts (Endamohoni, Lemo and Worreilu) in the Ethiopian highlands in 2014, 2015 and 2016 to assess landscape positions affecting crop-nutrient responses, identify yield limiting nutrients across the ‘Catena’ (N, P, K, S and Zn) and quantify effects of landscape positions on resources use efficiency. We clustered farmlands across the ‘Catena’ (Hillslopes, Midslopes and Footslopes) based on land scape positions in the respective locations. Wheat yield was more strongly and significantly affected by landscape positions (P < 0.001) than by nutrient sources or rates. The crop response to fertilizers was 50 to 300% higher in foot slopes than in hillslopes, depending on locations and inputs levels. With increasing slope, there was a decrease in a crop fertilizer response due to a significant decrease in soil organic carbon, clay content and soil water content, with r2 of 0.95, 0.86 and 0.96, respectively. The difference in the crop response between landscape positions was significantly higher (P < 0.05) with higher rates of nutrient applications (>N92 P46) while differences between landscape positions diminish at lower rates. Yield benefits due to application of K was significant only in the dry years (P < 0.05), while there was hardly any yield benefit from the application of zinc and sulfur. The crop nitrogen recovery fraction and crop water productivity decreased with an increasing slope regardless of nutrient combinations. The results indicated that the landscape position could be considered as a proxy indicator for targeted fertilizer application, particularly in farms with undulating topographic features. Hillslopes are better served by the application of organic fertilizers along with conservation measures as applying higher rates of mineral fertilizer in hillslopes would rather increase the risk of downstream nutrient movement. 2022-01 2020-02-07T18:18:56Z 2020-02-07T18:18:56Z Journal Article https://hdl.handle.net/10568/107008 en Open Access application/pdf Cambridge University Press Amede, T.; Gashaw, T.; Legesse, G.; Tamene, L.; Mekonen, K.; Thorne, P.; Schultz, S. (2020). Landscape positions dictating crop fertilizer responses in wheat-based farming systems of East African Highlands. Renewable Agriculture and Food Systems 13 p. ISSN: 1742-1713 |
| spellingShingle | landscape wheat efficiency levels paisaje trigo eficacia Amede, Tilahun Gashaw, Tadesse Legesse, Gizachew Tamene, Lulseged D. Mekonen, Kindu Thorne, Peter J. Schulz, Steffen Landscape positions dictating crop fertilizer responses in wheat-based farming systems of East African Highlands |
| title | Landscape positions dictating crop fertilizer responses in wheat-based farming systems of East African Highlands |
| title_full | Landscape positions dictating crop fertilizer responses in wheat-based farming systems of East African Highlands |
| title_fullStr | Landscape positions dictating crop fertilizer responses in wheat-based farming systems of East African Highlands |
| title_full_unstemmed | Landscape positions dictating crop fertilizer responses in wheat-based farming systems of East African Highlands |
| title_short | Landscape positions dictating crop fertilizer responses in wheat-based farming systems of East African Highlands |
| title_sort | landscape positions dictating crop fertilizer responses in wheat based farming systems of east african highlands |
| topic | landscape wheat efficiency levels paisaje trigo eficacia |
| url | https://hdl.handle.net/10568/107008 |
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