Department of Agronomy, Federal University of Viçosa, Viçosa 36570-900, MG, Brazil.
Department of Chemistry, Federal University of Viçosa, Viçosa 36570-900, MG, Brazil.
Int J Mol Sci. 2023 Jul 6;24(13):11154. doi: 10.3390/ijms241311154.
Biochar-amended soils influence the degradation of herbicides depending on the pyrolysis temperature, application rate, and feedstock used. The objective of this study was to evaluate the influence of sugarcane straw biochar (BC) produced at different pyrolysis temperatures (350 °C, 550 °C, and 750 °C) and application rates in soil (0, 0.1, 0.5, 1, 1.5, 5, and 10% /) on metribuzin degradation and soil microbiota. Detection analysis of metribuzin in the soil to find time for 50% and 90% metribuzin degradation (DT and DT) was performed using high-performance liquid chromatography (HPLC). Soil microbiota was analyzed by respiration rate (C-CO), microbial biomass carbon (MBC), and metabolic quotient (CO). BC350 °C-amended soil at 10% increased the DT of metribuzin from 7.35 days to 17.32 days compared to the unamended soil. Lower application rates (0.1% to 1.5%) of BC550 °C and BC750 °C decreased the DT of metribuzin to ~4.05 and ~5.41 days, respectively. BC350 °C-amended soil at high application rates (5% and 10%) provided high C-CO, low MBC fixation, and high CO. The addition of low application rates (0.1% to 1.5%) of sugarcane straw biochar produced at high temperatures (BC550 °C and BC750 °C) resulted in increased metribuzin degradation and may influence the residual effect of the herbicide and weed control efficiency.
生物炭改良土壤会影响除草剂的降解，具体取决于热解温度、施用量和所用原料。本研究旨在评估不同热解温度（350°C、550°C 和 750°C）下生产的甘蔗秸秆生物炭（BC）和不同土壤施用量（0、0.1、0.5、1、1.5、5 和 10%/）对灭草净降解和土壤微生物区系的影响。采用高效液相色谱法（HPLC）对土壤中灭草净的残留量进行检测，以确定灭草净降解 50%和 90%所需的时间（DT 和 DT）。通过呼吸率（C-CO）、微生物生物量碳（MBC）和代谢商（CO）分析土壤微生物区系。与未添加生物炭的土壤相比，添加 10%的生物炭 350°C 可将灭草净的 DT 从 7.35 天延长至 17.32 天。添加低用量（0.1%至 1.5%）的生物炭 550°C 和生物炭 750°C 可将灭草净的 DT 分别降低至约 4.05 和 5.41 天。高用量（5%和 10%）的生物炭 350°C 可提供高 C-CO、低 MBC 固定和高 CO。添加低用量（0.1%至 1.5%）的高温（生物炭 550°C 和生物炭 750°C）生产的甘蔗秸秆生物炭可提高灭草净的降解率，可能会影响除草剂的残留效果和杂草防治效率。
