Upper Assam Advisory Centre, Tea Research Association, Dikom 786101, Assam, India.
Indian Agricultural Statistics Research Institute, New Delhi 110012, India.
Bioresour Technol. 2020 Dec;318:124023. doi: 10.1016/j.biortech.2020.124023. Epub 2020 Aug 18.
The present study aimed to optimize the production of biochar from tea (Camellia sinensis L.) pruning litter. Characterization of biochar prepared from four tea pruning litters (mixed, Tocklai Vegetative 1, 22 and 25) at five pyrolysis temperatures (250, 300, 350, 400, 450, and 500 °C for 3 h) were documented. The results demonstrated that yield, total nitrogen, H:C, and O:C decreased steadily with increasing pyrolysis temperature. However, water holding capacity, ash content, fixed carbon, C:N, NH-N, NO-N, trace elements, total P and K, and germination index increased consistently with increasing pyrolysis temperature. All the prepared biochars are suitable for agriculture application as H:C and O:C ratios of prepared biochars are <0.6 and <0.4, respectively. Low pyrolysis temperature (<300 °C) was optimal to get more stable biochar with respect to essential nutrients. Biochar derived from Tocklai Vegetative 1 at 300 °C has more potential for agronomic applications. Principal component analysis showed >96% variability.
本研究旨在优化茶（Camellia sinensis L.）修剪枝叶生物炭的生产。本研究对四种茶修剪枝叶（混合、Tocklai 营养体 1、22 和 25）在五个热解温度（250、300、350、400、450 和 500°C 下热解 3 小时）下制备的生物炭进行了特性描述。结果表明，产率、总氮、H:C 和 O:C 随着热解温度的升高而稳步下降。然而，水保持能力、灰分含量、固定碳、C:N、NH-N、NO-N、微量元素、总 P 和 K 以及发芽指数随着热解温度的升高而持续增加。所有制备的生物炭都适合农业应用，因为制备的生物炭的 H:C 和 O:C 比分别小于 0.6 和小于 0.4。较低的热解温度（<300°C）最有利于获得更稳定的生物炭，以保留更多的必需养分。300°C 下从 Tocklai 营养体 1 制备的生物炭在农业应用方面具有更大的潜力。主成分分析显示 96%以上的变异性。
