Humification of Pig Slurry in Presence of Sawdust
One of the main economical activities of small farms in South Brazil is the swine production which produces a relatively high amount of pig slurry.The discard of this effluent as in natura in the environment may contaminate the soil and impair the crops.Therefore the aim of this study was to monitor the humification of swine slurry conducted in windrows,employing two different pH conditions.The composting of pig slurry was conducted with a 50% (m/m) mixture of sawdust and wood shaving in two pH conditions.The liquid pig slurry was weekly added at different rates and the total added amount of dry matter was approximately 82 kg in 3 months.In the weekly collected samples,the contents of C and N were determined and the humic substances (HS) were quantified.The C content of compost did not vary with time,while the decrease of C/N ratio indicated the humification of the slurry mixture.These results were corroborated by the increase of CHS and that of CHA/CFA ratio within 3 months.The acidic medium enhanced the formation of HA over FA.
Humic substances Chemical composition Nitrogen
Deborah P.Dick Marlon H.Arenhardt Celso Aita
aInstitute of Chemistry,Federal University of Rio Grande do Sul(UFRGS),Ave.Bento Gon(c)alves,9500,91 Laboratory of Carbon and Nitrogen Biotransformation,Soil Science Department,Federal University of Sa
国际会议
the 16th Meeting of the International Humic Substances Society (第十六届国际腐殖物质学会大会(IHSS 16))
杭州
英文
135-137
2012-09-09（万方平台首次上网日期，不代表论文的发表时间）