Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino (TO), Italy.
Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino (TO), Italy.
J Environ Manage. 2020 Sep 1;269:110767. doi: 10.1016/j.jenvman.2020.110767. Epub 2020 May 28.
Anaerobic digestates from sewage sludge (SSADs) are a by-product of the wastewater treatment process that still preserves a certain agronomic interest for its richness in plant nutrients and organic matter. Fertilizing properties of two liquid and two dewatered SSADs were tested on tomato plants (Solanum lycopersicum L.). Pot experiments were performed on sandy soil and peat substrate under greenhouse conditions with a SSADs application rate of 170 kg N/ha over a period of three months. Beneficial effects of SSADs were reported on different growth parameters, revealing an increase in biomass and height up to 37.5 and 6-folds over untreated control. No phytotoxic effect occurred on SSAD-exposed plants. Chemical analysis of soils treated with SSADs showed enrichment of macro- and micro-nutrients as well as organic matter. In some cases, the chemical characterization of leaves revealed an enhancement of uptaken macronutrients. This study contributed in general to deepen the knowledge on the short-term growing season fertilizing effects of SSAD. Despite the treatment dosage was calculated only on nitrogen requirements, the study highlighted the importance of the other nutrients and organic matter on plant growth.
来自污水污泥（SSADs）的厌氧消化物是废水处理过程的副产品，由于其富含植物养分和有机物，仍具有一定的农业兴趣。在温室条件下，用沙壤土和泥炭基质进行盆栽试验，在三个月内以 170 kg N/ha 的 SSADs 施用量，对番茄植株（Solanum lycopersicum L.）进行了测试。SSADs 对不同的生长参数有有益的影响，显示出生物量和高度的增加，最高可达未处理对照的 37.5 倍和 6 倍。暴露于 SSADs 的植物没有出现植物毒性。用 SSADs 处理的土壤的化学分析表明，大量和微量营养素以及有机物的富集。在某些情况下，叶片的化学特征表明吸收的大量营养素增加。本研究有助于加深对 SSAD 短期生长季节施肥效果的认识。尽管处理剂量仅根据氮需求计算，但研究强调了其他养分和有机物对植物生长的重要性。
