Richness of Rhizosphere Organisms Affects Plant P Nutrition According to P Source and Mobility

Jean Trap, Patricia Mahafaka Ranoarisoa, Usman Irshad and Claude Plassard
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Jean Trap: Eco&Sols, Institut Agro, Univ Montpellier, CIRAD, INRAe, IRD, 34060 Montpellier, France
Patricia Mahafaka Ranoarisoa: Eco&Sols, Institut Agro, Univ Montpellier, CIRAD, INRAe, IRD, 34060 Montpellier, France
Usman Irshad: Department of Environmental Sciences, COMSATS, University Islamabad, Abbottabad Campus, Abbottabad 22060, Pakistan
Claude Plassard: Eco&Sols, Institut Agro, Univ Montpellier, CIRAD, INRAe, IRD, 34060 Montpellier, France

Agriculture, 2021, vol. 11, issue 2, 1-9

Abstract: Plants evolve complex interactions with diverse soil mutualist organisms to enhance P mobilization from the soil. These strategies are particularly important when P is poorly available. It is still unclear how the soil P source (e.g., mineral P versus recalcitrant organic P) and its mobility in the soil (high or low) affect soil mutualist biological (ectomycorrhizal fungi, bacteria and bacterial-feeding nematodes) richness—plant P acquisition relationships. Using a set of six microcosm experiments conducted in growth chamber across contrasting P situations, we tested the hypothesis that the relationship between the increasing addition of soil mutualist organisms in the rhizosphere of the plant and plant P acquisition depends on P source and mobility. The highest correlation (R 2 = 0.70) between plant P acquisition with soil rhizosphere biological richness was found in a high P-sorbing soil amended with an organic P source. In the five other situations, the relationships became significant either in soil conditions, with or without mineral P addition, or when the P source was supplied as organic P in the absence of soil, although with a low correlation coefficient (0.09 < R 2 < 0.15). We thus encourage the systematic and careful consideration of the form and mobility of P in the experimental trials that aim to assess the role of biological complexity on plant P nutrition.

Keywords: soil P status; rhizospheric organisms; bacteria; nematodes; mycorrhizal fungi; biodiversity-function relationships (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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