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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Detalles Bibliográficos
Otros Autores: Rubio, Gerardo, Faggioli, Valeria Soledad, Scheiner, Javier David, Gutiérrez Boem, Flavio Hernán
Formato: Artículo
Lenguaje:Inglés
Materias:
MAIZE
NUTRITIENT ACQUISITION
PLANT ROOTS
SOYBEAN
SUNFLOWER
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2012Rubio.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 1 0 |a Rhizosphere phosphorus depletion by three crops differing in their phosphorus critical levels 
520 |a 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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900 |a ^aRubio^bG.^tSoil Fertility and Fertilizers, School of Agriculture, University of Buenos Aires and INBA, CONICET [National Council of Science and Technology], Av. San Martín 4453, C1417DSE Buenos Aires, Argentina 
900 |a ^aFaggioli^bV.^tINTA [National Institute of Agricultural Technology], EEA Marcos Juarez, Córdoba, Argentina 
900 |a ^aScheiner^bJ.D.^tUniversité de Toulouse, E.I. Purpan, UMR 1248 AGIR, Toulouse, France 
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900 |a 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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