Optimal nitrogen fertilizer, which determines straw properties, and pyrolysis temperatures produce desired-biochars that can be used as a soil amendment

Jining Zhang; Xianxian Zhang; Cong Wang; Huifeng Sun; Sheng Zhou

doi:10.1016/j.chemosphere.2022.136572

Optimal nitrogen fertilizer, which determines straw properties, and pyrolysis temperatures produce desired-biochars that can be used as a soil amendment

Chemosphere. 2022 Dec;308(Pt 3):136572. doi: 10.1016/j.chemosphere.2022.136572. Epub 2022 Sep 22.

Authors

Jining Zhang¹, Xianxian Zhang¹, Cong Wang¹, Huifeng Sun¹, Sheng Zhou²

Affiliations

¹ Eco-environmental Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, 201403, PR China; Shanghai Engineering Research Centre of Low-carbon Agriculture (SERCLA), Shanghai, 201415, PR China; Key Laboratory of Low-carbon Green Agriculture in Southwestern China, Ministry of Agriculture and Rural Affairs, Shanghai, 201403, PR China.
² Eco-environmental Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, 201403, PR China; Shanghai Engineering Research Centre of Low-carbon Agriculture (SERCLA), Shanghai, 201415, PR China; Key Laboratory of Low-carbon Green Agriculture in Southwestern China, Ministry of Agriculture and Rural Affairs, Shanghai, 201403, PR China. Electronic address: zhous@outlook.com.

PMID: 36155012
DOI: 10.1016/j.chemosphere.2022.136572

Abstract

This study investigated the straw harvested after nitrogen (N) fertilizer application levels (0, 75, 150 and 225 kg N hm^-2). The N fertilizer increased straw yield by 115.4-190.6%. In addition to N fertility, the pyrolysis temperatures (300, 500 and 700 °C) induced significant changes of the straw-derived biochar samples. The yield reduced from 41.4 wt% to 23.2 wt%, the residence time increased from 272 yr to 2194 yr, and the residual coefficient of organic C (F_perm) increased from 0.65 to 0.93 for the biochar samples as the temperature rising. The parameters of C sequestration were mainly affected by pyrolysis temperature. The N + P₂O₅+K₂O content (5.6-8.8%) of the biochar samples was more in the 500 °C treatment. The characteristics of nutrient supply were affected by both the N fertility and pyrolysis temperature. The N fertilizer rate of 150 kg N hm^-2 in the soil for wheat straw, together with the 500 °C treatment induces the best nutrient donor and C sequestration after biochar incorporation into the soil.

Keywords: Carbon sequestration; Nitrogen fertilizer rate; Nutrient retention; Pyrolysis temperature; Straw.

MeSH terms

Charcoal
Fertilizers*
Nitrogen / analysis
Pyrolysis
Soil*
Temperature

Substances

Fertilizers
Soil
biochar
Charcoal
Nitrogen