Iron toxicity in rice: Environmental conditions and symptoms
Iron toxicity is one of the problems most often found in lowland rice systems in West Africa. It is a nutritional disorder associated with high iron concentrations in soil solution. These high concentrations are partly inherent to location soil and partly result from a massive iron uptake from upstream soils through subsurface runoffs or inferroflux. The reductive conditions commonly found in clogged lowland soils are early signs of iron toxicity through the solubilization in soil solution of nearly all the iron content in its ferrous form (Fe2+). This large amount of ferrous ion in solution causes a disequilibrium in the mineral elements affecting growth of crops, especially rice. This ferrous iron (Fe2+) is readily absorbed and concentrates in the leaves, causing discoloration of the lamina, a reduction in tillering, and significant yield losses. The edaphic conditions in lowland soils necessary to the occurrence of iron toxicity are dependent on pedo-climatic conditions and therefore account for the high spatio-temporal variability of this constraint.
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| Format: | book_section biblioteca |
| Language: | eng |
| Published: |
WARDA [Africa Rice Center]
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| Subjects: | P35 - Fertilité du sol, P33 - Chimie et physique du sol, |
| Online Access: | http://agritrop.cirad.fr/540710/ |
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