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

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...

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Bibliographic Details
Published in:	Scientific reports 2019-10, Vol.9 (1), p.14878-11, Article 14878
Main Authors:	Nobile, C, Houben, D, Michel, E, Firmin, S, Lambers, H, Kandeler, E, Faucon, M-P
Format:	Article
Language:	eng
Subjects:	Acid phosphatase Acid Phosphatase - metabolism Agricultural sciences Agronomy Barley Biological Transport Brassica rapa - growth & development Brassica rapa - metabolism Calcium Phosphates - metabolism Canola Carboxylic Acids - metabolism Crops Crops, Agricultural Fertilizers Fertilizers - analysis Hordeum - growth & development Hordeum - metabolism Humans Life Sciences Mineralization Phosphorus Phosphorus - metabolism Phytic Acid - metabolism Plant Proteins - metabolism Plant Roots - metabolism Plant Stems - metabolism Sewage Sewage - chemistry Sludge Soil - chemistry Species Specificity Triticum - growth & development Triticum - metabolism Wheat
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Summary:	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.
ISSN:	2045-2322 2045-2322