Abstract
Iron toxicity is suspected to be a major nutritional disorder in rice cropping systems established on flooded organic soils that contain reductible iron. A pot trial was carried out to assess Fe toxicity to rice in flooded Burundi highland swamp soils with a wide range of organic carbon contents. Soil and leaf analyses were performed and total grain weight was determined. Clear Fe toxicity was diagnosed, based on leaf Fe content at panicle differentiation. Leaf Fe contents higher than 250 μg g−1 dry matter induced lower Mg (and probably Mn) uptake, and a 50% total grain weight reduction. These features were associated with exchangeable Fe equivalent fractions higher than 86%. Besides, several non-Fe toxic soils exhibited an Mg-Mn imbalance.
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Genon, J.G., de Hepcee, N., Duffy, J.E. et al. Iron toxicity and other chemical soil constraints to rice in highland swamps of Burundi. Plant Soil 166, 109–115 (1994). https://doi.org/10.1007/BF02185487
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DOI: https://doi.org/10.1007/BF02185487