Application of a microalgal slurry to soil stimulates heterotrophic activity and promotes bacterial growth

Algalization of acid soils with acid‐tolerant strains: Improvement in pH, carbon content, exopolysaccharides, indole acetic acid and dehydrogenase activity

“…In fact, the lowest activity of dehydrogenase observed in both the acid soils, which did not receive the microalgal strains (LC and DC), could be due to the lack of additional C source needed to promote the growth of indigenous microbes (Sarma, Borkotoki, Narzari, Kataki, & Gogoi, 2017). The fact that the application of algal filtrate (no live algae) to soil resulted in increased CO 2 flux through greater heterotrophic activities (Marks et al, 2017) supports our above finding. The increased CO 2 through respiration of microbial communities after the application of algal filtrate may be responsible for the increase in CO 2 emissions (Castro et al, 2017;Marks et al, 2017).…”

“…The ability of the acid-tolerant microalgae for passive uptake of CO 2 is very important in soils deprived of organic matter as reported for Australian dryland soils (Eldridge, Maestre, Koen, & Delgado-Baquerizo, 2018). Furthermore, CO 2 -fixing ability of acid-tolerant microalgae upon application to soils can also stimulate heterotrophic activities by enhancing their respiration (Marks et al, 2017).…”

“…Inoculation of two different cyanobacteria promoted soil stability and fertility in terms of OC, N input and total exopolysaccharide production (Chamizo, Mugnai, Rossi, Certini, & De Philippis, 2018). Marks et al (2017) reported that the application of Chlorella sp. in suspension and sterile filtrates enhanced respiration due to the formation of a stable community of eukaryotic and prokaryotic microorganisms.…”

“…In view of the carbon concentration mechanism following bicarbonate uptake and passive diffusion of CO 2 , microalgae have been shown to increase pH of the culture medium (Solovchenko et al, 2015). Application of microalgae improved health in soils with near neutral pH, semiarid and even desert soils (Castro et al, 2017;Chamizo et al, 2018;Marks et al, 2017Marks et al, , 2019Muñoz-Rojas et al, 2018; Rom an, Roncero-Ramos, Chamizo, Rodríguez-Caballero, & Cant on, 2018). Although studies concerning microbial diversity revealed the presence of microalgae in acid soils (Huss et al, 2002;Yuan et al, 2015;Zhalnina et al, 2015), their role in soil health has not been clearly established as yet.…”

Rural areas receptivity to innovative and sustainable agrifood processes. A case study in a viticultural territory of Central Spain

“…This fertilizer is produced through the growth of native micro algae present in the region's soils and serves as a biological improver of the lands for these same vineyards. The effects of this improvement are visible two or three years following their initial functioning (Marks et al, ). In Figure , the procedure used for the process is detailed, and it is evident that this is a circular process that closes both the material (upon using the residue generated in the wine cellar to produce bio‐fertilizer that is returned to the ground) and energy cycles (upon incorporating the energy produced in the very wine cellar system).…”