Land application of sewage sludge is a common disposal
option employed in many countries because sewage sludge contains abundant organic compounds, macronutrients, and micronutrients, and has been gaining popularity in agriculture
because of its fertilizer values and soil-conditioning properties
(Sreesai et al., 2013). The use of sewage sludge in agriculture
can effectively recycle waste in a sustainable way and prevent
the loss of soil fertility (Haudin et al., 2013). Therefore, the fertilizer effect of composted sludge is an important index for land
application, especially, for agriculture. The objective of this study
was to investigate the fertilizer effect and application of composted sewage sludge obtained by utilizing solar energy, including evaluation of chemical and maturity indices and pot
experiments.