1. Effects of returning corn straw and fermented corn straw to fields on the soil organic carbon pools and humus composition.
- Author
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Zhang, Yifeng, Dou, Sen, Ndzelu, Batande Sinovuyo, Ma, Rui, Zhang, Dandan, Zhang, Xiaowei, Ye, Shufen, and Wang, Hongrui
- Subjects
CORN straw ,HUMUS ,CARBON in soils ,TRICHODERMA reesei ,SOIL composition ,HUMIC acid - 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 d field experiment that included three treatments applied under equal carbon (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 -1 higher than in the CS treatment. Applying FCS-T appeared to promote a significant increase in SOC content, carbon pool activity index, and carbon pool management index through the accumulation of HA-C, humin carbon, and easily oxidizable organic carbon. Applying fermented corn straw treated with Trichoderma reesei (FCS-T) is more valuable and conducive to increasing soil easily oxidizable organic C (EOC) and humus C content than direct application of corn straw. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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