Abstract
A soil microcosm study was made to monitor changes in soil physical and microbiological properties of a Chernozem during a period of up to 126 or 252 days following the addition of whey, straw or vegetable oil. In the whey treatment soil maximum water-holding capacity (MWHC) had decreased after seven and 28 days of incubation. At both dates, the differences to the untreated control were significant. Straw was able to increase MWHC of soil during incubation and after 42 and 126 days values differed significantly from those of the control. Compared with the control, whey, oil and straw treatments had higher meanweight diameter of dry aggregates. The differences were significant after seven, 28 and 126 days with whey, after 42, 126 and 252 days with oil, and after 126 days with straw. The sensitivity of dry aggregates to abrasion (SAA), representing a negative index of dry aggregate stability, was lower in the whey treatment than in the control after three and seven days incubation. In the later phase of incubation, whey tended to increase SAA. A trend to increase SAA also was observed with straw and after 126 days a significantly higher SAA for the straw than for the oil treatment was determined. This trend still was to observe after 252 days incubation. An increase in SAA observed for the oil treatment after 42 days was followed by a decrease till the end of incubation. Aggregates of organic treatments were more resistant to the dispersive effect of water than those of the control. Microbial biomass-C contents were high in the whey treatment, ranging between 1931 and 754 μg g−1 soil dry mass during incubation. With whey, fungal contributions to biomass-C increased from 40.5% after three to 76.5% after 126 days incubation. Addition of straw or oil stimulated biomass synthesis less than whey. High fungal contributions to biomass-C, approx. 70%, were sustained by straw during incubation. With oil, fungal contributions were 20.5% after three, 76% after 42 and less than 20% after 126 and 252 days incubation. Fungal contributions to biomass-C correlated positively with SAA. High sensitivity of the fungal biomass to mechanical stress is discussed as a cause for the low dry aggregate stability of soils amended with organic substrates encouraging fungal biomass development.
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Sonnleitner, R., Lorbeer, E. & Schinner, F. Monitoring of changes in physical and microbiological properties of a Chernozem amended with different organic substrates. Plant and Soil 253, 391–402 (2003). https://doi.org/10.1023/A:1024873724718
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DOI: https://doi.org/10.1023/A:1024873724718