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100 1 _ |a Reichel, Rüdiger
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245 _ _ |a Spring barley performance benefits from simultaneous shallow straw incorporation and top dressing as revealed by rhizotrons with resealable sampling ports
260 _ _ |a Heidelberg
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520 _ _ |a from leaching. In poorly fertilized soil, excessive immobilization may limit nutrient availability and thus plant growth. Littleis known about the impact of a shallow straw incorporation on soil microbial regulation of top-dressing fertilizer nutrientsand spring crop establishment. We aimed to evaluate if wheat straw in combination with mineral fertilizer has more positiveeffects on plant performance than mineral fertilization alone and if this relates to changes of the extractable C:N:P ratio andmicrobial activity close to the roots. In order to conduct small-scale sampling with minimal disturbance during growth ofspring barley (Hordeum vulgare L.), we developed rhizotrons with resealable ports. Rhizotrons were filled with loamy-sandysoil and fertilized with an equivalent of 150 kg N and 80 kg P ha−1. Half of the rhizotrons received the top dressing togetherwith 4500 kg wheat straw-C ha−1. Throughout a 90-day greenhouse experiment, we analyzed soil C:N:P dynamics, and carbondioxide (CO2) and nitrous oxide (N2O) emission, together with microbial biomass, selected bacterial genes (abundance), andtranscripts (activity) in bulk and root-affected soil at multiple times. We focused on nitrifiers and denitrifiers and linked ourdata to barley growth. Interactions between straw and roots caused shifts towards larger C:P and C:N ratios in root-affectedsoil. These shifts were associated with increased 16S rRNA transcripts and denitrifier activities. Straw increased microbialbiomass by 124% in the topsoil and at the same time increased root biomass by 125% and number of tillers by 80%. Weconcluded that microbial activation at the root-straw interface may positively feed back on soil nutrient regulation and plantperformance. Further research has to evaluate if plant roots actively prime mining of previously immobilized nutrients inthe straw detritusphere or if effects of pathogen suppression and growth promotion are dominating.
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536 _ _ |a BonaRes (Modul A, Phase 3): INPLAMINT - Erhöhung der landwirtschaftlichen Nährstoffnutzungseffizienz durch Optimierung von Pflanze-Boden-Mikroorganismen-Wechselwirkungen, Teilprojekt A (031B1062A)
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700 1 _ |a Kamau, Catherine Wambui
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700 1 _ |a Kumar, Amit
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700 1 _ |a Li, Zhijie
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700 1 _ |a Radl, Viviane
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700 1 _ |a Temperton, Vicky M
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700 1 _ |a Schloter, Michael
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700 1 _ |a Brüggemann, Nicolas
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773 _ _ |a 10.1007/s00374-022-01624-1
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856 4 _ |u https://juser.fz-juelich.de/record/908533/files/Reichel2022_Article_SpringBarleyPerformanceBenefit.pdf
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