Poster (Scientific congresses and symposiums)
Evaluation of phosphorus bioavailability according to the soil organic matter content
Barbieux, Sophie; Colinet, Gilles
2015Soil interfaces for sustainable development (ISMOM 2015)
 

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Abstract :
[en] Phosphorus (P) is an essential nutrient for plants. The organic matter contains significant amounts of P which can be mineralized and supply soil solution. We hypothesize that increasing P organic pools in soils is a way to improve its progressive release for plants and alleviate risks of immobilization in mineral forms. The main objective of this study is to evaluate the P bioavailability and its uptake by plants according to the soil organic matter (SOM) content. The experimental protocol is based on a micro-culture in pots. The test-plant used is ryegrass (Lolium perenne L.). Eight silty soils were selected from vegetable gardens (5) and from a long-term fertilization trial on field (3). They present a gradient of SOM (from 2 to 9 %) and available P content (from 5 to 55 mg/100g). Plants were first grown in pure sand and P-free Hoagland nutritive solution. Ten days after plant emergence, roots were brought into contact with the studied soil during about one month. The experiment was stopped after three harvests (every 10 days) and three growth cycles. At the end of the experimentation, analyses were performed on plant material (biomass, P content) and on soil (soluble P, available P, microbial P, pH, phosphatase activity, hot water carbon, nitrate). Besides this study, an incubation experiment was carried out with the same soils without plant to assess soil P status at each harvest time. Paper will present the main findings of the experiment. Especially, the following issues should find answers: (1) do higher levels of SOM and organic phosphorus modify the evolution of P content in soil solution and its uptake by plants?, (2) are the biological processes involved in P cycling promoted in soils with higher SOM content?
Disciplines :
Agriculture & agronomy
Author, co-author :
Barbieux, Sophie ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes
Colinet, Gilles  ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes
Language :
English
Title :
Evaluation of phosphorus bioavailability according to the soil organic matter content
Publication date :
July 2015
Event name :
Soil interfaces for sustainable development (ISMOM 2015)
Event place :
Montréal, Québec, Canada
Event date :
du 5 au 10 juillet 2015
Audience :
International
Available on ORBi :
since 17 August 2015

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