A two dimensional simulation model of phosphorus uptake including crop growth and P response

Mollier, Alain; Willigen, P. de; Pellerin, Sylvain; Heinen, M.

doi:10.1007/0-306-47624-x_293

Cited by 11 publications

(19 citation statements)

References 8 publications

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“…Also, our results are of practical interest for designing new P indices which should rely on chemical P extractions sensitive to these factors. Although P mobilization processes linked to the rhizosphere activity are widely known (Mollier et al 2008;Hinsinger et al 2011), our results revealed which are the targeted P fractions in this mobilization and under which circumstances this mobilization can contribute to plant P uptake (P starvation in soil). They also provided additional support for the need to consider this mobilization in models to estimate P availability to plants from P indices and threshold values for these indices.…”

Section: Resultsmentioning

confidence: 68%

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

Recena

Torrent

Campillo

et al. 2015

Agron. Sustain. Dev.

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Efficient use of phosphorus (P) by plants in agriculture relies on accurate estimation of the phytoavailable soil P. However, poor relationships are frequently observed between P availability indices, such as Olsen P, and P uptake by plants. We therefore studied which soil properties modify the accuracy of Olsen P as a P availability index. We conducted a soil P depletion experiment in pots with 17 soils. Two samples differing widely in Olsen P were used for each soil and named "low-P" and "high-P." Soil was mixed with siliceous sand to achieve 1 mg of Olsen P per pot, so that the ratio of non-readily available P, either inorganic P or organic P, to Olsen P in the pot was higher for low-P than for high-P samples. Results show that, in high-P samples, P uptake by cucumber is positively correlated with the affinity of the soil solid phase for P, with R 2 of 0.76. In high-P samples, P uptake by cucumber is positively correlated with total P adsorption capacity as estimated by Fe in the form of Fe oxides, with R 2 = 0.56. P uptake is positively correlated with the inorganic P released by NaOH and citrate-bicarbonate in low-P samples, with R 2 of 0.52. In low-P samples, total organic P and phosphatase activity in the rhizosphere explained 37 % of plant P uptake. In low-P samples, phosphatase activity and pH explained 50 % of plant P uptake. These findings reveal that organic P forms and hydrolytic activity by roots are explaining P availability to plants. Whereas physico-chemical processes controlling inorganic P dynamics play a major role for low organic P/Olsen P ratios.

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Section: Resultsmentioning

confidence: 68%

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

Recena

Torrent

Campillo

et al. 2015

Agron. Sustain. Dev.

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show abstract

“…However, many easily confounding effects may apply on the plots considered due to N deficit, weeds, poor soil structure, etc. Disentangling such effects in order to highlight the P nutrition effect would require thorough regional agronomic diagnosis (Doré et al 1997) and use of a model capable of simulating crop growth under P deficiency (Mollier et al 2008;Greenwood et al 2001). Moreover, the use of the Olsen P method for low soil P test is debatable, raising the question of whether other indicators may be more well suited to assess soil P dynamics in organic farming systems due to the supposedly higher contribution of soil organic matter mineralisation, rhizosphere activity and mycorrhiza contribution to plant nutrition (Oehl et al 2002;Mäder et al 2002;Hinsinger et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Assessing phosphorus management among organic farming systems: a farm input, output and budget analysis in southwestern France

Nesme

Toublant

Mollier

et al. 2012

Nutr Cycl Agroecosyst

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Organic farming is gaining interest worldwide due to its low environmental impact. However, questions still remain about its long-term sustainability, particularly in terms of nutrient management. There is debate about the ability of organic farming systems to compensate for nutrient exports due to crop and animal production. Stockless systems are considered as the most critical and they are generally associated with negative farm-gate nutrient budgets. In this study, we examined the farm-gate nutrient budgets of 23 organic farms located in southwestern France, with special focus on stockless farming systems. Phosphorus (P) was taken as a case study due to the issue of its critical management in organic farming systems. The farms were characterised on the basis of interviews with farmers and the soil nutrient status was assessed through soil sampling. Results showed that none of the farms imported rock phosphate fertiliser. On the contrary, most farms imported organic fertiliser and/or compost and manure, the latter from neighbouring farms or urban areas. As a consequence, stockless farm P budgets were not necessarily negative and options existed from achieving better nutrient cycle closure. However, soil P test was low to moderate in many cases. These results suggested that P management in organic farming systems is not simply related to the mixed versus specialised characteristics of the farms and that nutrient cycling should be addressed and assessed at a larger, e.g., district, scale.

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“…Such a lower influence of root-induced processes in the P-fertilized treatment can explain why P uptake has been considered for years as the only root-induced chemical process in P-enriched soils (e.g. Barber 1995;Mollier et al 2008).…”

Section: Influence Of P Fertilizationmentioning

confidence: 99%

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

et al. 2011

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In this study we identified the nature of the root-induced chemical processes controlling changes in phosphate (P) availability in a soil with two P loadings resulting from long-term fertilization treatments. We used a set of mechanistic adsorption models (surface complexation and ion exchange) within the framework of the component additive approach to simulate the effect of durum wheat roots on P availability. We had to consider the influence of adsorption of other ions to ensure the goodness-of-fit of the simulations. We found that Ca(2+) uptake, in addition to P uptake and root-induced alkalization, controlled P availability in the rhizosphere regardless of the fertilization level. The relative influence of these three processes depends primarily on the extractant used to estimate P availability. Calcium uptake was the most significant process in water extracts, whereas P uptake was the dominant root-induced chemical process in CaCl(2) extracts. Under low Ca concentrations, Ca(2+) uptake decreased the promoting influence of Ca(2+) adsorption on P adsorption. In addition to confirming the validity of our approach to model P availability, the present investigation indicated that root-induced processes markedly affect P availability irrespective of the fertilization level

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A two dimensional simulation model of phosphorus uptake including crop growth and P response

Cited by 11 publications

References 8 publications

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

Assessing phosphorus management among organic farming systems: a farm input, output and budget analysis in southwestern France

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

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