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

Abstract. In our previous studies, we filtered out fungus (Trichoderma reesei) to have the best ability transform corn straw into a humic-acid-like substance through laboratory incubation experiments. order further verify former findings, set up 360 d field experiment that included three treatments applied under equal carbon (C) mass: (i) returned (CS), (ii) fermented treated with Trichoderma reesei (FCS-T), and (iii) blank control treatment (CK). Soil organic (SOC), soil labile C components, humus composition, management levels of SOC pools were analyzed compared. The results showed content CS FCS-T increased by 12.71 % 18.81 %, respectively, compared CK at d. humic acid (HA-C) was 0.77 g kg?1 higher than in treatment. Applying appeared promote significant increase content, pool activity index, index accumulation HA-C, humin carbon, easily oxidizable carbon. (FCS-T) is more valuable conducive increasing (EOC) direct application straw.