Landscape positions dictating crop fertilizer responses in wheat-based farming systems of East African Highlands

Amede, T and Gashaw, T and Legesse, G and Tamene, L and Mekonen, K and Thorne, P and Schultz, S (2020) Landscape positions dictating crop fertilizer responses in wheat-based farming systems of East African Highlands. Renewable Agriculture and Food Systems (TSI). pp. 1-13. ISSN 1742-1705

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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.

Item Type: Article
Divisions: Research Program : East & Southern Africa
Uncontrolled Keywords: Fertilizer response, Landscape position, Wheat
Subjects: Others > Wheat
Others > Fertilizer Applications
Others > East Africa
Depositing User: Mr Arun S
Date Deposited: 12 Mar 2020 05:35
Last Modified: 12 Mar 2020 05:35
Official URL:
Acknowledgement: We would like to thank Feed the Future, USAID (through AfricaRISING) and BMZ-Germany (through GIZ- ISFM+project, Ethiopia) for financing the work. We thank Prof. Ken Giller for his critical reviews. The site coordinators, namely Addis Asfaw, Mohamed Ebrahim, Temesgen Alene and Workneh Dubale and their assistants (Eyuel Tesfaye, Endeshaw Tadesse, Getachew Bisrat, Shimelis Mengistu and Fikadu) have made a substantial contribution in managing the field experiments with farmers. Staffs of Debre Berhan University, Maichew ATVET College and Mede Welabu University have supported us in managing the experiments in their respective locations. Drs Sridhar Gumadi and Job Kihara provided useful comments on the initial draft of the paper.
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