Properties of humus in relation to soil particle size fraction
2005
Dziamski, A.(University of Technology and Agriculture, Bydgoszcz (Poland). Dept. of Botany and Ecology) | Gonet, S.S.(Nicolaus Copernicus Univ., Torun (Poland). Dept. of Soil Science) | Debska, B.(University of Technology and Agriculture, Bydgoszcz (Poland). Dept. of Environmental Chemistry)
A model experiment was carried out to evaluate the effects of mixing organic fertilizers (cattle manure, vermicompost and wheat straw) with sandy soil material. Soil samples were taken from the 0-20 cm layer (soil material mixed with organic fertilisers) and the 20-35 cm layer (soil material only), after one year as well as after three years of incubation. Total organic carbon (TOC), total nitrogen (TN) and fractional composition of humus (humic acids, fulvic acids) were analysed in two particles size fractions (phi is greater than 0.1 mm - coarse fraction and phi is less than 0.1 mm - fine fraction). The results showed that the phi is less than 0.1 mm fraction accumulated three times more organic carbon than did the phi is greater than 0.1 mm fraction. Humus distribution between the two fractions depended on the kind of organic material added to the soil. Humus in the fine fractions was characterised by higher content of TN and insoluble fraction of organic matter, lower contribution of humic and fulvic acids if compared to the coarser fractions. Application of organic fertilisers to the soil caused an increase of the content of total nitrogen in both fractions. Three years after addition of organic fertilizers no migration of organic carbon and nitrogen in the soil profile was found.
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