Preprints
https://doi.org/10.5194/soil-2021-105
https://doi.org/10.5194/soil-2021-105

  25 Oct 2021

25 Oct 2021

Review status: this preprint is currently under review for the journal SOIL.

Effects of returning corn straw and fermented corn straw to fields on the soil organic carbon pools and humus composition

Yifeng Zhang1, Sen Dou1, Batande Sinovuyo Ndzelu1,2, Rui Ma1, Dandan Zhang1, Xiaowei Zhang1,3, Shufen Ye1, and Hongrui Wang1 Yifeng Zhang et al.
  • 1College of Resource and Environmental Science, Jilin Agricultural University, Changchun, Jilin Province 130118, China
  • 2National Engineering Laboratory for Improving Fertility of Arable Soils, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
  • 3College of Resource and Environmental Science, Nanjing Agricultural University, Nanjing, Jiangsu Province 210095, China

Abstract. In our previous studies, we filtered out fungus (Trichoderma reesei) to have the best ability to transform corn straw into a humic acid-like substance through laboratory incubation experiments. In order to further verify our former findings, we set up a 360 day-field experiment that included three treatments applied under equal C mass: (i) corn straw returned to the field (CS), (ii) fermented corn straw treated with Trichoderma reesei returned to the field (FCS-T), and (iii) blank control treatment (CK). Soil organic carbon (SOC), soil labile organic C components, soil humus composition, and the management levels of SOC pools under the three treatments were analyzed and compared. The results showed that the SOC content of CS and FCS-T treatments increased by 12.71 % and 18.81 %, respectively, compared with CK at 360 d. The humic acid carbon (HA-C) content of the FCS-T treatment was 0.77 g/kg higher than in the CS treatment. Application of FCS-T appeared to promote the significant increase of SOC, carbon pool activity index (CPAI) and carbon pool management index (CPMI) through accumulation of HA-C, humin carbon (HM-C), and easily oxidizable organic carbon (EOC) contents. Application of fermented corn straw treated with Trichoderma reesei (FCS-T) is more valuable and conducive to increasing soil EOC and humus C content than direct application of corn straw.

Yifeng Zhang et al.

Status: open (until 02 Jan 2022)

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  • RC1: 'Comment on soil-2021-105', Anonymous Referee #1, 24 Nov 2021 reply

Yifeng Zhang et al.

Yifeng Zhang et al.

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Short summary
How to effectively convert corn straw into high quality humic substances, return them to the soil in a relatively stable form, is a more concerned aspect. Application of fermented corn straw treated with Trichoderma reesei returned to the field (FCS-T) can promote the significant improvement of SOC and CPMI. We concluded that, application of the FCS-T in the soil is more valuable and conducive to increasing soil labile organic C and humus C content than direct application of corn straw.