title: Effects of repeated soil irrigation with liquid biological paper sludge on poplar Populus alba saplings: potential risks and benefits.
abstract: The authors explored the risks and benefits of repeated irrigation of Populus alba saplings with aqueous paper sludge (APS). Saplings were cultivated in pots of forest soil (3 L) in a greenhouse for 7 weeks and watered twice a week with differing concentrations of APS (0, 10, 20, 30, 50, 75, and 100 % v/v with deionized water). Plant growth and ecophysiological variables along with zinc and aluminum transfer were monitored. A stimulation of plant growth was observed with sludge treatments of 30 or 50 %, significantly correlated to APS input (r = 0.81). This may be explained by the easily available nitrogen as is shown with the positive correlation of CO2assimilation and leaf nitrogen (r = 0.70). However, a significant reduction in plant growth was observed when treatments of 75 and 100 % of APS were administered, despite a high nutritional level (nitrogen and phosphorus). The study suggests that APS concentrations from 30 to 50 % may positively affect the growth of poplar saplings; however, the higher concentrations indicated a risk for plant growth and the environment.
authors: Laboratoire Ecologie, Systématique et Evolution, UMR CNRS 8079, Université Paris-Sud, AgroParisTech, 91405, Orsay, France.
authors: Sylvain
authors: S
authors: Corbel
authors: Department of Agronomy, National School of Agriculture, km. 10, Route Haj Kaddour, B.P. S/40, 50001, Meknès, Morocco.
authors: Mohamed
authors: M
authors: Bourioug
authors: Laboratoire Chrono Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France.
authors: Laurence
authors: L
authors: Alaoui-Sossé
authors: Laboratoire Chrono Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France.
authors: Pascale
authors: P
authors: Bourgeade
authors: Laboratoire Chrono Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France.
authors: Badr
authors: B
authors: Alaoui-Sossé
authors: Laboratoire Chrono Environnement, UMR CNRS 6249, Université de Bourgogne Franche-Comté, 25030, Besançon, France. lotfi.aleya@univ-fcomte.fr.
authors: Lotfi
authors: L
authors: Aleya
mesh_terms: D057914:Agricultural Irrigation; D000535:Aluminum / Q000378:metabolism; D007220:Industrial Waste; D009584:Nitrogen / Q000378:metabolism; D010209:Paper; D010758:Phosphorus / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects; D032107:Populus / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D018570:Risk Assessment; D014867:Water; D015032:Zinc / Q000378:metabolism
chemical_list: D007220:Industrial Waste; D014867:Water; D010758:Phosphorus; D000535:Aluminum; D015032:Zinc; D009584:Nitrogen
keywords: Biological paper sludges; Populus alba, photosynthesis; Zinc and aluminum transfer