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Nitrogen mineralization and microbial biomass carbon and nitrogen in response to co-application of biochar and paper mill biosolids
- Source :
- Applied Soil Ecology. 142:90-98
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Adding biochar to paper mill biosolids (PB) amendments may affect PB mineralization rate and nitrogen (N) availability. The objective of this 224-day incubation study was to evaluate the effect of amending two PB types varying in carbon (C)/N ratio (PB1, C/N = 24; and PB2, C/N = 13) with three rates (0%, 2%, and 5%) of pine (Pinus strobus L.) biochar produced at 700 °C on the dynamics of total C, total N, mineral N, N mineralization rate, and microbial biomass C (MBC) and N (MBN) in two agricultural soils (Kamouraska clay and St-Antoine sandy-loam). Two reference treatments were also included, namely, mineral fertilization and unamended soil. Total soil C concentration remained stable over the incubation period, whereas a decrease in total soil N was observed in both soils. In comparison with the unamended soil, the application of PB significantly increased total N, NH4-N, NO3-N, net mineralized N, applied N mineralization rate, and MBC in both soils. In comparison with the application of PB alone, biochar addition increased total C and MBC but decreased NH4-N, NO3-N, net N mineralization, and applied N mineralization rate in both soils. The co-application of biochar and PB1 resulted in the sequestration of mineral N released, which was more pronounced in the Kamouraska clay soil. The co-application of biochar and PB2 resulted in moderate release of mineral N. This study showed that the co-application of biochar and PB can benefit agricultural soils by improving NO3-N retention in agroecosystems while increasing organic matter and promoting microbial biomass.
- Subjects :
- 0106 biological sciences
chemistry.chemical_classification
Ecology
Biosolids
Chemistry
business.industry
food and beverages
Soil Science
chemistry.chemical_element
Paper mill
04 agricultural and veterinary sciences
Mineralization (soil science)
complex mixtures
01 natural sciences
Agricultural and Biological Sciences (miscellaneous)
Nitrogen
Environmental chemistry
Soil water
Biochar
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
Organic matter
business
Nitrogen cycle
010606 plant biology & botany
Subjects
Details
- ISSN :
- 09291393
- Volume :
- 142
- Database :
- OpenAIRE
- Journal :
- Applied Soil Ecology
- Accession number :
- edsair.doi...........1a33883baddce5c2f88099108756926e