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The effect of annual additions of composted sewage sludge (CS) and thermally dried sewage sludge (TS) at 80 t ha −1 on soil chemical properties was investigated for three years in a field experiment under semiarid conditions. Humic acids (HAs) isolated by conventional procedures from CS, TS, and unamended (SO) and sludge amended soils were analysed for elemental (C, H, N, S and O) and acidic...
The use of organic amendments requires an adequate control of the chemical quality of their humic acid (HA)-like fractions and of the effects that these materials may have on the status, quality, chemistry and functions of native soil HAs. In this work, the compositional, functional and structural properties of the HA-like fractions isolated from a liquid swine manure (LSM), a municipal sewage sludge...
The main objective of this research was the evaluation of cumulative and residual, long-term (9 years) effects of amendment with municipal solid waste compost (MWC) used at rates of 20 and 80 t ha -1 on the chemical, structural and functional properties of soil humic acids (HAs). For this propose, HAs were isolated from the MWC sample, the unamended control soil and MWC-amended soils...
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