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Effects of Biochar and its Reapplication on Soil pH and Sorption Properties of Silt Loam Haplic Luvisol
Summary
Biochar was tested on agricultural soil to assess its effects on pH and nutrient sorption, finding modest improvements that persisted with reapplication. While focused on soil management, biochar is also studied as a potential tool for improving soil health in contaminated environments.
Abstract In this paper we investigate the effects of biochar alone and its reapplication and combination with N-fertilizer (1) on the soil pH, and (2) sorption parameters. The soil samples were taken during growing period in 2018 from plots with different biochar (first application in 2014 – A, reapplication in 2018 – B) at application rates: 0 t.ha −1 (B0 control), 10 t.ha −1 (B10) and 20 t.ha −1 (B20) and different nitrogen fertilization: N0 (no nitrogen) and N40 (40 kg.ha −1 ). Our results showed that the first application of biochar at the rate of 20 t.ha −1 (B20A) without N-fertilizer significantly increased the values of soil pH in H 2 O, soil pH in KCl, the sum of base cations (SBC) and cation exchange capacity (CEC) compared to control (B0). Similar effects were observed also after reapplication of biochar (B10B). All investigated parameters in fertilized control treatment (B0N40) were worst and the first application, as well as the reapplication of biochar with N, caused significant increase of soil pH in H 2 O, soil pH in KCl, SBC, CEC, BS and decrease of hydrolytic acidity.
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