| Abstrakt: |
Application of biomass-derived low-cost biochar alter cropland soil's ability to store organic carbon dynamics. At the ICAR-Sikkim Centre in Gangtok, India, a 10-year field experiment was conducted to investigate the effects of different organic manures (5.0 to 10.0 t ha−1) and maize biomass-derived low-cost biochar (pyrolysis temperature 600 °C) applications on soil carbon dynamics. The biochar was characterized by TEM, SEM, TGA, EDS, XRD, and FT-IR for morpho-mineralogical data. Different organic manures and maize biomass–derived biochar considerably enhanced soil carbon dynamics and pools. Low-cost biochar application at 2.5 t ha−1 significantly increased the very labile carbon followed by a decrease at 5 t ha−1. Manure with biochar delivered a huge impact on the active carbon pool as compared with manure without biochar. Biochar 5 t ha−1 + vermicompost 5 t ha−1 (23.41) augmented the passive carbon pool more than control (8.90) significantly. Besides, augmenting biochar addition rate in soil significantly reduced the lability index having a higher value with 2.5 t ha−1 than 5 t ha−1. Also, vermicompost 5 t ha−1 + biochar 5 t ha−1 (2.31) increased the carbon pool index significantly than the control. Interestingly, augmenting the low-cost biochar addition rate significantly enhanced the carbon management index. With the increase in days of incubation, the cumulative carbon mineralization of different biochars increased. Among the biochars, the highest % C mineralization of the initial TOC was found in black gram biochar. Data showed that the addition rate and type of biochar caused a considerable change in the decay constant. The mineralization quotient was more at a lower rate than the higher rate of biochar application. Our research conclusively established that in order to improve SOC dynamics and pools in the maize-black gram system in India's northeastern regions, low-cost biochar technology is advised. [ABSTRACT FROM AUTHOR] |
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