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- W2740642013 abstract "Organic waste fertilizers have previously been observed to significantly affect soil organic carbon (SOC) content and soil structure. However, the effect of organic waste fertilizers on colloid dispersibility and leaching of colloids from topsoil has not yet been studied extensively. We investigated how the repeated application of different types of agricultural (liquid cattle slurry and solid cattle manure) and urban waste fertilizers (sewage sludge and composted organic household waste) affected soil physical properties, colloid dispersion from aggregates, tracer transport, and colloid leaching from intact soil cores. Total porosity was positively correlated with SOC content. Yearly applications of sewage sludge increased absolute microporosity (pores <30 μm) and decreased relative macroporosity (pores >30 μm) compared with the unfertilized control, whereas organic household waste compost fertilization increased both total porosity and the absolute porosity in all pore size classes (though not significant for 100–600 μm). Treatments receiving large amounts of organic fertilizers exhibited significantly lower levels of dispersible colloids compared with an unfertilized control and a treatment that had received moderate applications of cattle slurry. The content of water‐dispersible colloids could not be explained by a single factor, but differences in SOC content, electrical conductivity, and sodium adsorption ratio were important factors. Moreover, we found that the fertilizer treatments did not significantly affect the solute transport properties of the topsoil. Finally, we found that the leaching of soil colloids was significantly decreased in treatments that had received large amounts of organic waste fertilizers, and we ascribe this primarily to treatment‐induced differences in effluent electrical conductivity during leaching. Core Ideas Sewage sludge application may lead to an increase in the percentage of small pores. Organic waste compost application leads to a general increase in porosity. Large amounts of organic waste fertilizers lead to decreased leaching of colloids. Soil water EC may be a stronger determinant of colloid leaching than organic C." @default.
- W2740642013 created "2017-08-08" @default.
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- W2740642013 date "2017-07-01" @default.
- W2740642013 modified "2023-10-16" @default.
- W2740642013 title "Long-term Effects of Organic Waste Fertilizers on Soil Structure, Tracer Transport, and Leaching of Colloids" @default.
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- W2740642013 doi "https://doi.org/10.2134/jeq2016.11.0457" @default.
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