Optimum biochar preparations enhance phosphorus availability in amended Mollisols of Northeast China
ABSTRACT 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.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Instituto de Investigaciones Agropecuarias, INIA
2019
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| Online Access: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392019000100153 |
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