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Chilean journal of agricultural research

On-line version ISSN 0718-5839

Abstract

HAN, Ying; CHEN, Xiangwei; WANG, Enheng  and  XIA, Xiangyou. Optimum biochar preparations enhance phosphorus availability in amended Mollisols of Northeast China. Chil. j. agric. res. [online]. 2019, vol.79, n.1, pp.153-164. ISSN 0718-5839.  http://dx.doi.org/10.4067/S0718-58392019000100153.

Biochar amendment to soils can improve soil P availability, but details on the optimum application of biochar to black soils in Northeast China are limited. Three types of biochar were produced at six pyrolysis temperatures (between 200 and 700 °C) and then added to black soil samples. P adsorption-desorption isotherms were fitted by the Langmuir model to evaluate the changes in soil P adsorption-desorption after biochar amendment. Changes in P adsorption and desorption depended on biochar feedstock type and pyrolysis temperature. When pyrolysis temperature increased up to 400 °C, P sorption maximum (Qm) of soybean pod (SP) and soybean straw (SS) biochar-amended soils were enhanced from 855.65 and 428.84 mg kg-1 to 1666.67 and 1547.62 mg kg-1, respectively, while a further increase in the pyrolysis temperature lowered the adsorption capacity. However, P adsorption of corncob (CC) biochar amended soils declined from 1428.57 mg kg-1 to 556.70 mg kg-1 as pyrolysis temperature increased. Higher P desorption in SP and SS compared with CC indicated that SP and SS biochar produced at higher than 400 °C pyrolysis temperatures were considered to be the optimum biochar to enhance P availability in the black soils of Northeast China.

Keywords : Batch equilibrium method; biochar amendment; black soil; feedstock type; pyrolysis temperature; phosphorus adsorption and desorption..

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