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 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% and 77% 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.
| Main Authors: | , , , |
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| Format: | info:ar-repo/semantics/artículo biblioteca |
| Language: | eng |
| Published: |
Wiley
2012-12
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| Subjects: | Maíz, Soja, Helianthus Annuus, Fósforo, Suelo, Rizosfera, Maize, Soybeans, Phosphorus, Soil, Rhizosphere, Girasol, |
| Online Access: | https://onlinelibrary.wiley.com/doi/abs/10.1002/jpln.201200307 http://hdl.handle.net/20.500.12123/5174 https://doi.org/10.1002/jpln.201200307 |
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