Abstract
Agricultural efforts to end hunger in Africa are hampered by low fertilizer-use-efficiency exposing applied nutrients to losses. This constitutes economic losses and environmental concerns related to leaching and greenhouse gas emissions. The effects of NH4NO3 (0, 60 and 120 kg N ha−1) on N uptake, N-leaching and indirect N2O emissions were studied during three maize (Zea mays L.) cropping seasons on clay (Chromic luvisol) and sandy loam (Haplic lixisol) soils in Zimbabwe. Leaching was measured using lysimeters, while indirect N2O emissions were calculated from leached N using the emission factor methodology. Results showed accelerated N-leaching (3–26 kg ha−1 season−1) and N-uptake (10–92 kg ha−1) with N input. Leached N in groundwater had potential to produce emission increments of 0–94 g N2O-N ha−1 season−1 on clay soil, and 5–133 g N2O-N ha−1 season−1 on sandy loam soil following the application of NH4NO3. In view of this short-term response intensive cropping using relatively high N rate may be more appropriate for maize in areas whose soils and climatic conditions are similar to those investigated in this study, compared with using lower N rates or no N over relatively larger areas to attain a targeted food security level.
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Acknowledgments
This study was sponsored through grants from the European Union (NitroEurope Project No. 017841) for which the authors are extremely grateful. We are also grateful for the technical assistance from the Department of Physics (University of Zimbabwe).
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Mapanda, F., Wuta, M., Nyamangara, J. et al. Nitrogen leaching and indirect nitrous oxide emissions from fertilized croplands in Zimbabwe. Nutr Cycl Agroecosyst 94, 85–96 (2012). https://doi.org/10.1007/s10705-012-9528-7
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DOI: https://doi.org/10.1007/s10705-012-9528-7