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.

Highlights

  • Recycling and returning crop residues as soil amendments has proven to be an important prospect for increasing soil carbon 25 (C) content and increasing crop yield (Villamil et al, 2015) and for managing crop straw residues

  • 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) 15 blank control treatment (CK)

  • The FCS-T treatment was more effective than CS treatment in terms of soil carbon storage

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Summary

Introduction

Recycling and returning crop residues as soil amendments has proven to be an important prospect for increasing soil carbon 25 (C) content and increasing crop yield (Villamil et al, 2015) and for managing crop straw residues. Assessing labile SOC fractions after crop straw applications may provide information about the formation of SOC Another important index to monitor the effects of agricultural management practices on soil C sequestration is the Carbon Pool Management Index (CPMI) (Tang et al, 2018; Ma et al, 2021). We assumed that: (1) application of fermented corn straw treated with T. reesei (FCS-T) will be the most efficient in increasing soil humus content and soil C storage; (2) application of FCS-T may increase soil labile organic C components (WEOC, EOC, and MBC); and (3) application of FCS-T may increase CPMI level more than direct corn straw application These assumptions are based on that T. reesei inoculant has strong humification ability compared with 65 direct application of corn straw

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