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- W4313223319 abstract "Abstract The composition of horticultural substrates for soilless greenhouse cultivation directly affects the sustainability of the cropping system but has also an indirect effect through the end-of-life of the spent media. Biochar amendment in growing media as bulk material and source of nutrients may improve the sustainability of controlled-environment agriculture. Horticultural substrates at the end of soilless strawberry and tomato cultivation were compared in 6 trials at commercial scale. Conventional mineral wool and peat-based blends were compared with peat-reduced and peat-free organic blends with or without 10 vol% biochar. Nutrients, C stability of the growing media and their value as soil improver were measured. The organic growing media had a high potential for reuse and for C storage. Spent mineral wool was significantly richer in total P, K, Mg and Ca and significantly lower in organic C content and C stability than the other blends, with a clearly lower value as soil improver than the organic blends. Biochar amendment in renewable organic blends increases its value as soil improver and the potential for reuse: adding 10 vol% biochar in the blend significantly increased the C content by 8% and the C:N ratio of the spent growing media but not the C stability. The pH of the biochar in the growing media decreased from 9.1 to 6.2 due the cultivation while the CEC increased. This research illustrates the feasibility of using biomass and biochar in cascade, i.e., first as growing medium, and finally as a C-rich soil improver." @default.
- W4313223319 created "2023-01-06" @default.
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- W4313223319 date "2022-12-28" @default.
- W4313223319 modified "2023-10-03" @default.
- W4313223319 title "Cascading use of renewable growing media versus peat or mineral wool: added value of biochar for end-of-life, recycling of nutrients and C storage potential" @default.
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- W4313223319 doi "https://doi.org/10.21203/rs.3.rs-2399045/v1" @default.
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