Root-induced processes controlling phosphate availability in soils with contrasted P-fertilized treatments

Devau, Nicolas; Hinsinger, Philippe; Cadre, Edith Le; Gérard, Frédéric

doi:10.1007/s11104-011-0935-3

Cited by 44 publications

(20 citation statements)

References 62 publications

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“…Such alkalization in the rhizosphere of maize (see Fig. 7d) agrees with previous studies on other cereals intercropped with legumes Devau et al 2011b;Betencourt et al 2012). For maize intercropped with legumes, this would lead to rhizosphere alkalization if Ca were not taken up by maize.…”

Section: Discussionsupporting

confidence: 91%

“…Most studies reported depletion of P availability in the rhizosphere via plant root uptake during the crop cycle (Hinsinger 2001;Hinsinger et al 2011;Pan et al 2008). Only a few recent studies have shown an increase in P availability in the rhizosphere of durum wheat and chickpea (Devau et al 2010(Devau et al , 2011bBetencourt et al 2012). However, these studies were conducted under controlled conditions using rhizobox and pot experiments.…”

Section: Discussionmentioning

confidence: 99%

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The intercropping cowpea-maize improves soil phosphorus availability and maize yields in an alkaline soil

et al. 2014

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Aim: This study assessed whether growing cowpea can increase phosphorus (P) availability in the rhizosphere and improve the yield of legume-cereal systems. In alkaline Mediterranean soils with P deficiency, it is assumed that legumes increase inorganic P availability.Methods: A field experiment was conducted at the Staoueli experimental station, in Algiers province, Algeria, to compare the growth, grain yield, P availability, and P uptake by plants with sole-cropped cowpea (Vigna unguiculata L. cv. Moh Ouali) and maize (Zea mays L. cv. ILT), intercropped cowpea-maize, and fallow. Results: P availability in the rhizosphere was increased in both sole cropping and intercropping systems compared with fallow. It was highest in intercropping. The increase in P availability was associated with (i) significant pH changes of the rhizosphere of cowpea in sole cropping and intercropping systems, with the rhizosphere acidification significantly higher in intercropping (−0.73 units) than in sole cropping (−0.42 units); (ii) significant increase in the rhizosphere pH of intercropped maize (+0.49 units) compared to fallow; (iii) increased soil respiration (C-CO2 from microbial and root activity) in intercropping compared with sole cropping and fallow; and (iv) higher efficiency in utilization of the rhizobial symbiosis in intercropping than in sole-cropped cowpea. Conclusion With cowpea-maize intercropping, cowpea increased the P uptake, by increasing the P availability by rhizosphere pH changes in an alkaline soil. Overall, this study showed that intercropping cowpea improved the plant biomass and grain yield of maize in this soil

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

The intercropping cowpea-maize improves soil phosphorus availability and maize yields in an alkaline soil

et al. 2014

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“…In addition, plant P concentrations increased linearly with fertilizer rates. Some plants can modify the soil chemical properties such as pH and the cation exchange capacity by exuding organic acids in the rhizosphere (Devau et al, 2011). However, in the present experiment the average pH was 5.2 in RH and 5.4 in TH and it was not affected by phosphate fertilization or Congo grass (results not shown).…”

Section: Resultscontrasting

confidence: 70%

“…The effect of cover crops, mainly legumes, enhancing P availability has been observed before (Kamh et al, 1999;Richadson et al 2011;Hassan et al, 2013), but results on the effect of no-till on available P are inconclusive and depend on the soil type (Zibilske et al, 2002;Pavinato et al, 2009;Devau et al, 2011). However, these results were obtained in a pot experiment where roots were very close together and the proportion of rhizosphere soil is higher than it would be under field conditions.…”

Section: Discussionmentioning

confidence: 90%

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Soil phosphorus dynamics as affected by Congo grass and P fertilizer

Rosolem

Merlin

Büll

2014

Sci. agric. (Piracicaba, Braz.)

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Some plant species can change soil phosphorus (P) availability and this may be an important tool in managing tropical high fixing phosphorus soils. An experiment was conducted to evaluate phosphorus transformations in the soil and phosphatase activity during periods of Congo grass (Brachiaria ruziziensis, Germain et Evrard) growth in two tropical soils receiving 20, 40, 80, 160 mg dm −3 of inorganic P. Plants were grown for 84 days in 8-L pots. Acid phosphatase activity, P in the microbial mass, soil organic and inorganic P and P accumulation by Congo grass were evaluated. Phosphorus fertilization increased soil P availability, Congo grass yields and P accumulation in the plant. On average, less labile P forms in the soil were not changed by Congo grass; however, the P in the soil extracted with HCl (P-Ca -non labil form) decreased. This decrease may have resulted from the combination of the presence of grass and phosphatase capacity to dissolve less available P in the soil. Thus, soil exploration by Congo grass roots and the subsequent extraction of calcium phosphate may have increased the P concentration in the plant tissue. Despite the decrease in the P extracted from the soil with HCl resulting in increased labile P forms in the soil, the effect of Congo grass on the availability of P depends on the soil type.

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Impact of roots, microorganisms and microfauna on the fate of soil phosphorus in the rhizosphere

Hinsinger

Herrmann

Lesueur³

et al. 2015

Annual Plant Reviews Volume 48

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Phosphorus (P) occurs at low concentrations in soils because of the numerous processes responsible for P sorption or immobilisation. Soil P is also characterised by its restricted mobility, and thus the most limiting step of P acquisition is not its absorption by plant roots, but rather the many processes that determine the fate of soil P in the rhizosphere. This chapter describes these various processes, including those directly mediated by plants (which vary considerably with plant species), and those related to soil microbial and microfaunal activities. In order to overcome the restricted mobility of soil P, plants have evolved several features aimed at increasing the rhizosphere volume by increasing the absorptive surfaces, notably root elongation and branching. The formation of root hairs and mycorrhizas is also triggered by interactions with plant growth promoting microorganisms. Plants have also evolved strategies aimed at increasing soil P concentrations via the mobilisation of inorganic and organic pools of soil P. These imply changes in pH, and the release of P-mobilising compounds such as carboxylates and phosphatases, that are exuded by the roots themselves or by rhizosphere microorganisms. Finally, the soil microfauna (especially the predators of bacteria and fungi) play an important role in the cycling of soil P in the rhizosphere that deserves further consideration. (Résumé d'auteur

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Root-induced processes controlling phosphate availability in soils with contrasted P-fertilized treatments

Cited by 44 publications

References 62 publications

The intercropping cowpea-maize improves soil phosphorus availability and maize yields in an alkaline soil

The intercropping cowpea-maize improves soil phosphorus availability and maize yields in an alkaline soil

Soil phosphorus dynamics as affected by Congo grass and P fertilizer

Impact of roots, microorganisms and microfauna on the fate of soil phosphorus in the rhizosphere

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