Changes of soil-rhizosphere microbiota after organic amendment application in a Hordeum vulgare L. short-term greenhouse
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Changes of soil-rhizosphere microbiota after organic amendment application in a Hordeum vulgare L. short-term greenhouse experiment Michael M. Obermeier & Eva-Maria L. Minarsch & Abilash C. Durai Raj & Francois Rineau & Peter Schröder Received: 28 February 2020 / Accepted: 6 July 2020 # The Author(s) 2020
Abstract Aims In order to counteract the enduring decreases in the quality of agricultural land, mechanistic studies for a more sustainable agricultural crop production were performed. They aimed to assess the effects of organic amendments in combination with mineral fertilizer on soil-rhizosphere microbiota and their influence on soil health and plant performance. Methods In a short-term greenhouse experiment, the effects of pelletized spent mushroom substrate, with different combinations of biochar and mineral fertilizer,
Michael M. Obermeier and Eva-Maria L. Minarsch contributed equally to this work. Responsible Editor: Yongguan Zhu. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04637-7) contains supplementary material, which is available to authorized users. M. M. Obermeier : E. 0.01 are considered insignificant (white). Shown are only those soil and plant parameters sharing at least two significant p-values with the most abundant families
organic nitrogen. The unchanged DOC content within the microcosms also reflected this stability of the organic pool. In addition, the unaffected content of MBN in the soil-rhizosphere environment indicated that the C/N ratio of the OAs did not induce microbial N immobilization. The significant increase of nitrogen observed for treatment B_MF140 is likely due to application of mineral fertilizer, which was almost 3-times as high as for all other MF treatments (Supplementary Table S1). Nonetheless, a trend evolved towards higher nitrate-N contents remaining in soils amended with higher amounts of biochar and MF compared to treatments containing no or only low amounts of biochar and MF (Supplementary Fig. S2). This trend might be explained by the Nmin retention capacity of biochar, described by Prendergast-Miller et al. (2014) who also observed higher nitrate-N after cultivating H. vulgare plants in biochar amended soils. However, the effects observed in this short-term experiment are only weak, since the initial soil (see controls) contained sufficient nitrate-N for plant growth. Best plant performance was observed in treatments P and P_MF50 and was therefore independent of mineral
fertilizer application. Nutrients provided by the pellets alone were sufficient to intensify plant performance and maintain good soil quality. No beneficial effects of combining organic amendment with mineral fertilizer on plant performance, different from Zhao et al. (2016), were observed within this study. However, a slight trend towards decreasing TPB alongside with an increase of biochar could be observed (Supplementary Fig. S2). This is in accordance with Liu et al. (2018) who outlined the importance of the correct
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