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Effect of biochar amendment on nitrate retention in a silty clay loam soil

Angela Libutti, Massimo Mucci, Matteo Francavilla, Massimo Monteleone
  • Massimo Mucci
    Star AgroEnergy Research Unit, Department of Science of Agriculture, Food and Environment, University of Foggia, Foggia, Italy
  • Matteo Francavilla
    Star AgroEnergy Research Unit, Department of Science of Agriculture, Food and Environment, University of Foggia, Foggia, Italy
  • Massimo Monteleone
    Star AgroEnergy Research Unit, Department of Science of Agriculture, Food and Environment, University of Foggia, Foggia, Italy

Abstract

Biochar incorporation into agricultural soils has been proposed as a strategy to decrease nutrient leaching. The present study was designed to assess the effect of biochar on nitrate retention in a silty clay loam soil. Biochar obtained from the pyrogasification of fir wood chips was applied to soil and tested in a range of laboratory sorption experiments. Four soil treatments were considered: soil only (control), soil with 2, 4 and 8% of biochar by mass. The Freundlich sorption isotherm model was used to fit the adsorbed amount of nitrate in the soil-biochar mixtures. The model performed very well in interpreting the experimental data according to a general linear regression (analysis of co-variance) statistical approach. Nitrate retention in the soilbiochar mixtures was always higher than control, regardless the NO3 concentration in the range of 0-400 mg L–1. Different sorption capacities and intensities were detected depending on the biochar application rate. The highest adsorption capacity was observed in the soils added with 2 and 4% of biochar, respectively. From the results obtained is possible to infer that nitrate retention is higher at lower biochar addition rate to soil (2 and 4%) and at lower nitrate concentration in the soil water solution. These preliminary laboratory results suggest that biochar addition to a typical Mediterranean agricultural soil could be an effective management option to mitigate nitrate leaching.

Keywords

Biochar; Freundlich sorption model; groundwater quality; nitrate leaching; nutrients retention.

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Submitted: 2016-03-10 12:47:23
Published: 2016-08-10 14:07:36
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Copyright (c) 2016 Angela Libutti, Massimo Mucci, Matteo Francavilla, Massimo Monteleone

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