Rhizosphere phosphorus depletion by three crops differing in their phosphorus critical levels
It has been reported for many soils that maize [Zea mays L.] has a higher soil-P critical level than soybean [Glycine max L.] and sunflower [Helianthus annuus L]. The objective of this work was to compare the rhizosphere P depletion in these three species in order to investigate if they differ in th...
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| Otros Autores: | , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Materias: | |
| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2012Rubio.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| Sumario: | It has been reported for many soils that maize [Zea mays L.] has a higher soil-P critical level than soybean [Glycine max L.] and sunflower [Helianthus annuus L]. The objective of this work was to compare the rhizosphere P depletion in these three species in order to investigate if they differ in their capacity to acquire soil P. Sequential P fractionation and pH were determined in rhizosphere and nonrhizosphere soil samples from field and greenhouse experiments. Neither sunflower [the species with highest rhizosphere acidification] nor soybean or maize showed a significant relationship between P depletion and rhizosphere pH. The labile P fraction and the NaOH-Pi fraction had lower values in the rhizosphere than in the bulk soil in 38 percent and 77 percent of the studied cases, respectively. Sunflower and especially maize presented a more intense Pi depletion than soybean. The comparison between sunflower and maize revealed that neither of them took a clear advantage over the other in terms of P depletion. Rhizosphere Pi depletion was associated with the amount of P acquired by the plants. We conclude that the accessibility to different P pools does not explain the differences in soil-P critical levels among the three species. |
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| ISSN: | 1436-8730 |