Agegnehu, G and Desta, G and Amare, T and Agumas, B and Legesse, G and Amede, T and Alemu, E and Bazie, Z and Abera, A and Bulo, F and Demiss, M and Degefu, T and Chala, G and Abera, D and Hundessa, M and Abebe, A and Desalegn, T and Feyisa, T and Wendt, J and Nagarajan, L and Singh, Upendra and Stewart, Z (2025) Targeting nutrient sources and forms to identify yield-limiting nutrients for wheat under contrasting rainfall regimes and landscape positions in mixed-farming systems. Journal of Plant Nutrition. pp. 1-25. ISSN 0190-4167
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Abstract
Wheat yield gap in Ethiopia is high due to low nutrient availability, soil heterogeneity, undulating landscape, and climate. A study was conducted to identify yield-limiting nutrients for wheat yield under varying landscape positions and rainfall regimes. The treatments included all nutrients in blended (All-Blend), compound (All-Comp), and individual (All-Ind) forms containing N, P, K, S, Zn, and B, while K, S, Zn, and B omitted treatments were (All-Blend)-K, (All-Blend)-S, (All-Blend)-Zn, and (All-Blend)-B. Besides, NP only, 50 and 150% of the rate of all nutrients in the blended form (All-Blend), and a control without any nutrients were included. Results showed that the highest yield was obtained from the application of 150% of All-Blend across landscape positions and rainfall regimes, with grain yield improvement of 109.5% (2.54 t ha−1) by applying 150% of All-Blend under the foot slope position and high rainfall regime compared to the control and yield improvement of 72.5% under the low rainfall regime. With the control treatment grain yield was lower by 27–70% across landscape positions and rainfall regimes. The grain yield penalties due to K, S, Zn, and B omission were 0.54–9% over landscape positions and rainfall regimes compared to applying All-Blend, implying that the omission of K, S, Zn, and B were not yield-limiting nutrients for wheat production in the study areas. Thus, it will be crucial to consider landscape strata and rainfall regimes to optimize NP rates. Further study is also suggested as nutrient applications in blended, compound, or individual forms are inadequate to conclude.
| Item Type: | Article |
|---|---|
| Divisions: | Research Program : East & Southern Africa |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | Blended fertilizer, bread wheat, compound fertilizer, landscape position, nutrient sources and forms, rainfall regime, yield-limiting nutrients |
| Subjects: | Others > Crop Yield Others > Fertilizers Others > Wheat |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 07 Jul 2025 05:03 |
| Last Modified: | 07 Jul 2025 05:05 |
| URI: | http://oar.icrisat.org/id/eprint/13209 |
| Official URL: | https://www.tandfonline.com/doi/abs/10.1080/019041... |
| Projects: | UNSPECIFIED |
| Funders: | Soil Consortium of the U.S. Agency for International Development (USAID) through the International Fertilizer Development Center (IFDC). |
| Acknowledgement: | The Ethiopian Institute of Agricultural Research (EIAR), Amhara Region Agricultural Research Institute (ARARI), Southern Agricultural Research Institute (SARI), Agricultural Research Centers of the respective Research Institutes, and other partner institutions involved in the implementation and execution of these comprehensive nutrient omission field trials are highly acknowledged. We thank Mr. Henok Desalegn for the cluster analysis. We also thank the participating farmers for hosting and engaging with this study. The soil samples collected and prepared in Ethiopia were analyzed at the IFDC’s laboratory. |
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