Abstract
Alfalfa is a fodder food widely demanded by breeders; their classic cultural practice is characterized by the disrespect for the environment and the destruction of the soil. Several sustainable and environmentally friendly fertilizer alternatives, including biochar, have already been proposed. Numerous studies have investigated the effects of biochar on various physiological and productivity parameters of plants. However, there is a notable scarcity of research comparing the impacts of biochar derived from multiple biomasses at different doses, with and without other organic fertilizers with conventional fertilizers. To accurately characterize our substrates, we conducted physicochemical and morphological analyses of biochar, biocompost, manure, and soils. Subsequently, a pot study was conducted to assess the impact of biochar from various sources and doses on alfalfa’s productivity and physiological parameters. To this end, the various productivity and photosynthesis parameters were continuously monitored during this study. These tests showed biochars were very different in terms of chemical and organic compositions depending on the origin of the starting biomass. The combination of biochar sewage sludge and argan shell displayed exceptionally high levels of heavy metal content, with iron (Fe) exceeding 7000 mg/L. Biochar obtained by the pyrolysis of argan shells has on its surface just the basic elements C, Ca, and K with O which was barely detected on the surface. The biocompost exhibited a nitrogen content of less than 0.9% and demonstrated elevated levels of heavy metals, indicating its inferior quality. The comparison of the two agricultural practices under investigation demonstrated that conventional methods utilizing manure, with or without chemical fertilizers, remain the most effective approach for alfalfa productivity. However, certain types of biochar exhibited comparable levels of productivity, specifically the biochar derived from industrial agro-food sewage sludge. Notably, when this biochar was combined with biocompost at a 6% concentration for both of them, it resulted in an initial harvest with a fresh weight of approximately 17 g. Conversely, some biochar, such as the one composed of 6% tomato waste mixed with 3 and 6% biocompost, completely hindered germination at specific doses. Additionally, our study revealed that photosynthesis primarily relies on the plant’s physiological response at a specific time, rather than being influenced by growing conditions or substrate composition. In conclusion, this study has demonstrated that each treatment carries its own set of advantages and disadvantages across one or more productivity parameters. The optimal selection among these treatments hinges solely on the intended purpose and sought objectives. Despite all these conclusions, a long-term field study can approve or abrogate these results.
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Data Availability
The data used to support the findings of this study are available from the corresponding author upon request.
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The authors wish to thank the Laboratory of Biotechnology, Materials and Environment of the Faculty of Science of Agadir, the Polydisciplinary Faculty of Taroudant, and the Faculty of Applied Sciences of Ait Melloul, University Ibn Zohr, for the funding of this study.
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El Moussaoui, H., Idardare, Z. & Bouqbis, L. Assessing Alfalfa Productivity and Physiological Parameters: Biochar and Biocompost Versus Conventional Fertilizers with Manure and Chemical Fertilizers. Water Air Soil Pollut 234, 606 (2023). https://doi.org/10.1007/s11270-023-06618-9
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DOI: https://doi.org/10.1007/s11270-023-06618-9