Unravelling the Role of Rhizosphere Microbiome and Root Traits in Organic Phosphorus Mobilization for Sustainable Phosphorus Fertilization. A Review

Abstract

Moving toward more sustainable sources for managing phosphorus (P) nutrition in agroecosystems, organic phosphorus (Po) derived from organic inputs and soil is increasingly considered to complement mineral P fertilizer. However, the dynamics of P added by organic input in soil-plant systems is still poorly understood and there is currently no clear information on how the Po composition of these amendments determines P availability through interactions with the soil microbiome and root traits. Here, we review the main mechanisms of rhizosphere microbiome and root traits governing the dynamics of organic input/soil-derived Po pools in the soil-plant system. We discuss the extent to which the major forms of Po derived from organic input/soil can be used by plants and how this could be improved to provide efficient utilization of organic inputs as potential P sources. We provide new insights into how a better understanding of the interactions between Po forms, root traits, and rhizosphere microbiomes can help better manage P fertilization, and discuss recent advances in the mobilization and recovery of Po from organic inputs. We then develop proposed strategies in agroecology that could be used to improve Po utilization, specifically by better linking plant traits and Po forms, and developing new cropping systems allowing more efficient Po recycling.

New insights into sorption and desorption of organic phosphorus on goethite, gibbsite, kaolinite and montmorillonite

“…However, this indicates that the higher adsorption of IHP relative to other OP compounds did not necessarily imply that its binding capacity is always strong and stable under all environmental conditions. Thus, we suggest that despite the higher accumulation of myo-IHP reported in most soils (Amadou et al, 2021;Gerke, 2015), its desorption may be easier than that of the GLY or G6P forms, although this depends greatly on the soil minerals and experimental conditions . Furthermore, our results indicated that if both GLY and G6P species compete with myo-IHP for the same active sites on soil minerals, the binding energy of GLY or G6P would be higher than that of myo-IHP.…”

“…Furthermore, in the presence of different OP forms in soils, the preferential adsorption of myo-IHP or IP over both G6P and GLY may increase G6P and GLY availability and promote their mineralization. Thus, this contrasting adsorption dynamics of OP versus IP have important implications for P management from organic input in soils because IHP, GLY and G6P can comprise up to 80% of total P in some organic input (Amadou et al, 2021;Darch et al, 2014;George et al, 2018), and many animal manures, notably those from monogastrics (pigs, poultry), contain substantial quantities of inositol phosphates (Hu et al, 2020a;Peperzak et al, 1959).…”

“…On the other hand, accumulation of P in the soil increases the risk of P leaching and runoff, consequently leading to eutrophication of surface waters (Hansen et al, 2002). Therefore, with the increasing use of organic resources as P fertilizers (Amadou et al, 2021), a sustainable and efficient use of organic P (OP) fertilizers is of utmost importance to secure future crop production and reduce environmental hazard (Faucon et al, 2015). However, most of the research investigating the fate of P applied to the soil has focused on inorganic P (IP) so far, showing that most of it was adsorbed onto iron (Fe) and aluminum (Al)-oxides and clays minerals (Celi et al, 2000(Celi et al, , 1999 or precipitated with Ca (Houben et al, 2011;Urrutia et al, 2013).…”

“…However, most of the research investigating the fate of P applied to the soil has focused on inorganic P (IP) so far, showing that most of it was adsorbed onto iron (Fe) and aluminum (Al)-oxides and clays minerals (Celi et al, 2000(Celi et al, , 1999 or precipitated with Ca (Houben et al, 2011;Urrutia et al, 2013). In contrast, the fate of OP has been disregarded so far even though it is now clear that these forms of P can be at least as available as IP (Amadou et al, 2021;Kahiluoto et al, 2015). Organic P can be mineralized along with plant uptake and/or be protected by organic substances from adsorption, even in the long term (Huang and Zhang, 2012).…”

Role of Soil Minerals on Organic Phosphorus Availability and Phosphorus Uptake by Plants

“…They have received considerable attention due to their high P adsorption capacity (Bortoluzzi et al, 2015;Ryan et al, 2001) which may causes an OP utilization e ciency in soils as low as 5-10% (He et al, 1994). This leads to poor utilization of OP sources in agroecosystems (Amadou et al, 2021;Sulieman and Mühling, 2021). Indeed, OP compounds adsorbed on minerals were found to be the most stable P forms in different soil types (Martin et al, 2002;Montalvo et al, 2015).…”