Compost Produced with Addition of Sewage Sludge as a Source of Fe and Mn for Plants

K. Gondek, M. Mierzwa-Hersztek, M. Kopeć, I. Spałek
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引用次数: 4

Abstract

Abstract Direct application of sewage sludge to soil is controversial due to, among others, its highly variable composition, odour, and risks for health. The obtained composts with the addition of sewage sludge were tested for the contents and availability of manganese and iron. Once composts were applied to the soil, their effect on the content and availability of Mn and Fe in soil and bioaccumulation in the plant were determined. The addition of sewage sludge enriched composts with manganese and iron, but did not increase the content of water-extracted forms of Mn and Fe. The compost with addition of biochar had more organic matter-bound forms of Mn and Fe. Composts amended with sewage sludge had lower effect on the amount of Poa pratensis L. biomass than maize straw compost. The content of Mn and Fe in Poa pratensis L. was in the range permissible for biomass used as fodder. Smaller addition of all composts to the soil significantly increased the content of mobile manganese forms; however, neither the type nor the dose had effect on the content of iron mobile forms. There was no significant differences in the content of organic matter-bound forms of Mn and Fe in soil after the application of composts.
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污泥添加作为植物铁锰来源的堆肥研究
污水污泥直接应用于土壤是有争议的,其中包括其高度可变的成分、气味和健康风险。对添加污泥后得到的堆肥进行了锰、铁含量和有效度的测定。堆肥施用后,测定其对土壤中锰和铁的含量和有效性以及植物体内生物积累的影响。污泥的添加使堆肥中锰和铁含量增加,但没有增加水提态锰和铁的含量。添加生物炭的堆肥具有更多的有机结合形式的锰和铁。污泥改性堆肥对草地Poa生物量的影响低于玉米秸秆堆肥。草芥中锰、铁含量在生物质饲料允许范围内。土壤中所有堆肥添加量较小,均显著增加了流动态锰的含量;然而,类型和剂量对铁的流动形态含量没有影响。施用堆肥后,土壤中Mn和Fe的有机质结合形态含量无显著差异。
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