Agricultural use of sewage sludge under sub-humid Mediterranean conditions: effect on growth, yield, and metal content of a forage plant

Anaerobic digestates from sewage sludge used as fertilizer on a poor alkaline sandy soil and on a peat substrate: Effects on tomato plants growth and on soil properties

“…Application of SSAD improved chlorophyll content values of tomato plants grown on sandy soil at the end of second month, as well as dry biomass and net photosynthesis (A N ). This beneficial effect has been already observed also in sunflower (Bourioug et al, 2018), sorghum (Alvarenga et al, 2016) and triticale (Kchaou et al, 2018). On the other hand, literature provides examples of reduction of leaf chlorophyll content in tomato after treatment with SS (Elloumi et al, 2016), which is probably due to the excessive heavy metals presence in the used SS (Singh and Agrawal, 2007).…”

“…Taking into account the works using SS dosages comparable to 170 kg N/ha, the majority were open field experiments. For instance, triticale (X Triticosecale Wittmack) (Kchaou et al, 2018) revealed a biomass increase of 2-folds. Furthermore, results of the present work corroborate positive effects on biomass of SS application on soils poor in nutrients (Walter et al, 2000) and strongly alkaline (Zuo et al, 2019).…”

Practice of wastewater irrigation and its impacts on human health and environment: a state of the art

“…Leafy green vegetables that accumulate higher metal concentrations are more susceptible to toxic metals like cadmium as compared to non-leafy vegetables (Qureshi et al 2016;Naser et al 2018). Usually, the toxicity of metals increases in plant tissues due to wastewater irrigation, and the maximum accumulation is found in roots as compared to leaves (Balkhair et al 2016;Kchaou et al 2018). The long-term impacts of wastewater irrigation on agricultural crops, as reported through various case studies around major parts of the world are represented in Table 2.…”

Comportamiento térmico de biomasa procedente de cultivos energéticos convencionales y nuevos cultivos = Thermal behaviour of biomass derived from traditional and new energy crops

“…Determinados autores han destacado que la utilización de lodos puede ser suficiente para mejorar las propiedades químicas del suelo y que, incluso, dependiendo de la naturaleza y la planta en cuestión, este tipo de fertilizante puede reemplazar a los fertilizantes inorgánicos disminuyendo la dosis aplicada (Samaras et al, 2008). Además, la literatura (Belhaj et al, 2016;Kchaou et al, 2018) recomienda verificar el contenido en metales pesados de los suelos que hayan sido fertilizados con lodos ya que, aunque no se puede afirmar que exista una clara evidencia de que los lodos sean una fuente de este tipo de metales. Sin embargo, López-Mosquera y su grupo de trabajo (2000) sugieren que la aplicación de estos lodos es el principal origen de estos metales.…”