Department of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan, Iran.
Waste Manag Res. 2024 Dec;42(12):1195-1207. doi: 10.1177/0734242X231219631. Epub 2024 Jan 13.
A large amount of agricultural waste is produced annually. Producing biochar is an excellent solution for waste management, resource recovery, emission reduction, energy production, reduction in transportation and enhancing carbon sequestration. This study was done to investigate the aeration status of biochar-based growth media as compared with the commercial soilless medium of cocopeat-perlite. Biochars from oven-dried residues were produced by slow pyrolysis at 300 (B300) and 500°C (B500) with a rate of 2°C min and using a continuous inflow of nitrogen. Sawdust (Sd), wheat straw (WS), rice hull (Rh), palm bunches (Plm) and sugarcane bagasse (SC), their biochars, vermiculite (V) and zeolite (Z) were used to prepare 13 mixed growth media. Oxygen diffusion coefficient () of media was measured at six matric potentials () of -5, -10, -15, -20, -40 and -60 hPa. Troeh et al. (1982) model was fitted to / versus air-filled porosity (AFP) data. Although AFP was more than 0.1 m m for some media, the / was very low. Considering optimum / (i.e. 0.010-0.015) for growth substrates at = -8 hPa, aeration status of four media (cocopeat-perlite, Rh-SCB300-Z, Sd-SCB300-Z and WSB500-Rh-V) was optimum. Highest / at = -8 hPa was observed for Rh-SCB300-Z. The AFP at = -10 hPa was highest for Rh-SCB300-Z, cocopeat-perlite and WSB500-Rh-V. Biochar-based media with good aeration status and water retention can be a suitable substitute for commercial soilless culture in greenhouse production. Overall, WSB500-Rh-V is a suitable substitute for cocopeat-perlite.
每年都会产生大量的农业废弃物。生产生物炭是一种极好的废物管理、资源回收、减排、能源生产、减少运输和增强碳封存的解决方案。本研究旨在研究生物炭基生长介质的通气状况，与商业无土栽培椰糠-珍珠岩相比。生物炭是通过在 300°C（B300）和 500°C（B500）下以 2°C/min 的速率缓慢热解，并使用氮气连续流入来制备的。锯末（Sd）、小麦秸秆（WS）、稻壳（Rh）、棕榈束（Plm）和甘蔗渣（SC）、它们的生物炭、蛭石（V）和沸石（Z）被用于制备 13 种混合生长介质。在-5、-10、-15、-20、-40 和-60 hPa 六种基质势下测量了介质的氧气扩散系数（）。Troeh 等人（1982 年）模型被拟合到/与空气填充孔隙率（AFP）数据。尽管一些介质的 AFP 大于 0.1 mm，但/非常低。考虑到在= -8 hPa 下生长基质的最佳/（即 0.010-0.015），四种介质（椰糠-珍珠岩、Rh-SCB300-Z、Sd-SCB300-Z 和 WSB500-Rh-V）的通气状况是最佳的。在= -8 hPa 下观察到的最高/是 Rh-SCB300-Z。在= -10 hPa 时，Rh-SCB300-Z、椰糠-珍珠岩和 WSB500-Rh-V 的 AFP 最高。具有良好通气状况和保水能力的生物炭基介质可以替代温室生产中的商业无土栽培。总的来说，WSB500-Rh-V 是椰糠-珍珠岩的合适替代品。
