Department of Agriculture, Food, Environment and Forestry, University of Florence, Florence, Italy.
Department of Agronomy Food Natural Resources Animals and Environment, University of Padua, Legnaro, Italy.
J Sci Food Agric. 2019 Oct;99(13):5624-5630. doi: 10.1002/jsfa.9815. Epub 2019 Jul 9.
The use of reclaimed dredged sediments as growing media may offer a profitable alternative to their disposal as a waste and at the same time meets the need of peat-substitute substrates in horticulture. When sediments are reused to cultivate food crops, issues related to human health rise due to potential accumulation of contaminants in the product. This pilot study aimed at verifying the suitability of a reclaimed dredged port sediment, used pure or mixed with peat, as a growing medium for lettuce cultivation.
The pure sediment caused a reduction in crop yield, probably due to its unsuitable physical properties, whereas the mixture sediment-peat and pure peat resulted in the same yield. Although the sediment contained potentially phytotoxic heavy metals and some organic pollutants, no symptoms of plant toxicity were noted. Besides, no organic contaminants were detected in lettuce heads, and heavy metals amounts were not hazardous for consumers. Conversely, plants grown in the sediment were particularly rich in minerals like Ca, Mg and Fe, and showed higher concentrations of organic acids and antioxidants.
The use of the sediment as a growing medium for lettuce was shown to be safe for both inorganic and organic contaminants. Nevertheless, considering crop yield results, the mixture of the sediment with other materials is recommended in order to produce a substrate with more suitable physicochemical properties for vegetable cultivation. © 2019 Society of Chemical Industry.
将疏浚沉积物再利用作为生长介质，不仅可以盈利，还可以替代泥炭作为园艺用的替代基质，同时解决了处置这些沉积物的问题。然而，当沉积物被重新用于种植粮食作物时，由于污染物在产品中的潜在积累，可能会引发与人类健康相关的问题。本研究旨在验证作为生菜栽培用生长介质，单独使用或与泥炭混合使用的疏浚港口沉积物的适用性。
纯沉积物可能由于其物理性质不合适，导致作物产量降低，而纯泥炭和沉积物-泥炭混合物的产量相同。尽管沉积物中含有潜在的植物毒性重金属和一些有机污染物，但未观察到植物毒性症状。此外，生菜头中未检测到有机污染物，重金属含量对消费者无危害。相反，在沉积物中生长的植物特别富含钙、镁和铁等矿物质，并且有机酸和抗氧化剂的浓度更高。
使用沉积物作为生菜的生长介质，在无机和有机污染物方面均被证明是安全的。然而，考虑到作物产量的结果，建议将沉积物与其他材料混合使用，以生产出更适合蔬菜栽培的具有更适宜理化性质的基质。 © 2019 英国化学学会。
