High rice husk ash doses applied to the soil can lead to phosphorus water contamination

Innovative substrates for sugarcane seedling production: Sewage sludges and rice husk ash in a waste-to-product strategy

“…On the other hand, the pH increased when RHA was added to SS-2 formulations, agreeing with Fermino et al (2018), who observed increased pH in substrates when carbonized rice husk was combined with other materials. In soils, Teixeira et al (2019) and Islabão et al (2016) also observed increased pH with additions of RHA. In SS-3 formulations (Subs.…”

“…Rice husk ash (RHA) is also considered as a valuable organic waste, being generated from the burning of rice husks for energy production in low-efficiency production plants and/or in the rice milling industry (Teixeira et al, 2019). In Brazil, the production potential of RHA is around 0.44 million tons per year, with the immediate effect of its application in agricultural soils being as an amendment (Islabão et al, 2016), used to increase the soluble silicon and phosphorus content in the soil (Teixeira et al, 2019). Previous studies have documented RHA's role as a soil conditioner and as a substrate component and some commercial products containing RHA are available for purchase in the local market.…”