O. Alvarez-Campos, G. Evanylo, Mike J. Badzmierowski
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引用次数: 10
摘要
摘要优质(EQ)生物固体可以开发成可以修复受干扰的城市土壤的产品,用于生产花园蔬菜。本研究的目的是将专门为城市土壤使用而开发的新EQ生物固体产品与现有产品进行比较,以确定其支持发芽和植物生长的能力,并量化其植物有效氮(N)和磷(P)。在温室生物测定中,使用大豆(Glycine max L.)和高羊茅(Festuca arundinacea Schreb.)对七种EQ生物固体产品和一种无机肥料对照进行了比较,以评估产品质量和养分有效性。EQ生物固体来源于热干燥、堆肥以及与互补有机和矿物材料混合等处理过程。EQ生物固体产品以估计的等效农艺氮率施用,能够使植物充分发芽和生长。与已知的无机氮吸收率相比,用生物固体改良剂生长的高羊茅对氮的吸收证实,对于热干燥、混合和堆肥的EQ生物固体产品,有机氮的有效性分别约为40%、20%和15%。在磷含量充足的土壤中,以农艺氮含量施用这些产品,可将土壤磷饱和度提高到20%-35%,这是不过度富含磷的土壤的正常范围。EQ生物固体产品中氮和磷的可用性将使其在城市土壤中具有农业效益和环境无害的用途。
Development and Assessment of Exceptional Quality Biosolids Products for Urban Gardens
Abstract Exceptional Quality (EQ) biosolids may be developed into products that can rehabilitate disturbed urban soils for the production of garden vegetables. The objectives of this study were to compare newly developed EQ biosolids products specially tailored for urban soil use with those of established products for the purpose of identifying their capability to support germination and plant growth, as well as to quantify their plant available nitrogen (N) and phosphorus (P). Seven EQ biosolids products and an inorganic fertilizer control were compared in greenhouse bioassays employing soybean (Glycine max L.) and tall fescue (Festuca arundinacea Schreb.) to assess product quality and nutrient availability. The EQ biosolids were derived from treatment processes such as thermal drying, composting, and blending with complementary organic and mineral materials. The EQ biosolids products applied at an estimated equivalent agronomic N rate enabled adequate germination and plant growth. The N uptake by tall fescue grown with the biosolids amendments compared with known rates of inorganic N confirmed organic N availability to be approximately 40%, 20%, and 15% for thermally dried, blended, and composted EQ biosolids products, respectively. The application of these products at agronomic N rates to a soil testing adequate in P increased soil P saturation to 20%–35%, a normal range for soil not excessively enriched with P. The availability of N and P in the EQ biosolids products will permit their agronomically beneficial and environmentally sound use in urban soils.
期刊介绍:
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Compost Science & Utilization is currently abstracted/indexed in: CABI Agriculture & Environment Abstracts, CSA Biotechnology and Environmental Engineering Abstracts, EBSCOhost Abstracts, Elsevier Compendex and GEOBASE Abstracts, PubMed, ProQuest Science Abstracts, and Thomson Reuters Biological Abstracts and Science Citation Index