Phosphorus-acquisition strategies of canola, wheat and barley in soil amended with sewage sludges

Abstract : Crops have different strategies to acquire poorly-available soil phosphorus (P) which are dependent on their architectural, morphological, and physiological root traits, but their capacity to enhance p acquisition varies with the type of fertilizer applied. the objective of this study was to examine how P-acquisition strategies of three main crops are affected by the application of sewage sludges, compared with a mineral P fertilizer. We carried out a 3-months greenhouse pot experiment and compared the response of p-acquisition traits among wheat, barley and canola in a soil amended with three sludges or a mineral P fertilizer. Results showed that the P-acquisition strategy differed among crops. Compared with canola, wheat and barley had a higher specific root length and a greater root carboxylate release and they acquired as much p from sludge as from mineral p. By contrast, canola shoot p content was greater with sludge than with mineral p. this was attributed to a higher root-released acid phosphatase activity which promoted the mineralization of sludge-derived p-organic. this study showed that contrasted p-acquisition strategies of crops allows increased use of renewable p resources by optimizing combinations of crop and the type of p fertilizer applied within the cropping system.
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C. Nobile, D. Houben, E. Michel, S. Firmin, H. Lambers, et al.. Phosphorus-acquisition strategies of canola, wheat and barley in soil amended with sewage sludges. Scientific Reports, Nature Publishing Group, 2019, 9, pp.14878. ⟨10.1038/s41598-019-51204-x⟩. ⟨hal-02319872⟩

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