@article{01GPWS66BY6C0GGS8J4BEER4D7,
  abstract     = {{Recovery of biobased fertilizers derived from manure to replace synthetic fertilizers is considered a key strategy to close the nutrients loop for a more sustainable agricultural system. This study evaluated the nitrogen (N) fertilizer value of five biobased fertilizers [i.e., raw pig manure (PM), digestate (DIG), the liquid fraction of digestate (LFD), evaporator concentrate (EVA) and ammonia water (AW)] recovered from an integrated anaerobic digestion-centrifugation-evaporation process. The shoot and root growth of maize (Zea mays L.) under biobased fertilization was compared with the application of synthetic mineral N fertilizer, i.e., calcium ammonium nitrate (CAN). The non-invasive technologies, i.e., minirhizotron and unmanned aerial vehicle (UAV) based spectrum sensing, were integrated with the classic plant and soil sampling to enhance the in-season monitoring of the crop and soil status. Results showed no significant difference in the canopy status, biomass yield or crop N uptake under biobased fertilization as compared to CAN, except a lower crop N uptake in DIG treatment. The total root length detected by minirhizotron revealed a higher early-stage N availability at the rooting zone under biobased fertilization as compared to CAN, probably due to the liquid form of N supplied by biobased fertilizers showing higher mobility in soil under dry conditions than the solid form of CAN. Given a high soil N supply (averagely 70-232 kg ha(-1)) in the latter growing season of this study, the higher N availability in the early growing season seemed to promote a luxury N uptake in maize plants, resulting in significantly (p < 0.05) higher N concentrations in the harvested biomass of PM, LFD and AW than that in the no-N fertilized control. Therefore, the biobased fertilizers, i.e., PM, LFD, EVA and AW have a high potential as substitutes for synthetic mineral N fertilizers, with additional value in providing easier accessible N for crops during dry seasons, especially under global warming which is supposed to cause more frequent drought all over the world.}},
  articleno    = {{988932}},
  author       = {{Luo, Hongzhen and Dewitte, Kevin and Landschoot, Sofie and Sigurnjak, Ivona and Robles Aguilar, Ana and Michels, Evi and De Neve, Stefaan and Haesaert, Geert and Meers, Erik}},
  issn         = {{2296-665X}},
  journal      = {{FRONTIERS IN ENVIRONMENTAL SCIENCE}},
  keywords     = {{nitrogen use efficiency,biobased fertilizer,minirhizotron,unmanned aerial vehicle,soil mineral nitrogen,drought stress,luxury nitrogen uptake}},
  language     = {{eng}},
  pages        = {{14}},
  title        = {{Benefits of biobased fertilizers as substitutes for synthetic nitrogen fertilizers : field assessment combining minirhizotron and UAV-based spectrum sensing technologies}},
  url          = {{http://doi.org/10.3389/fenvs.2022.988932}},
  volume       = {{10}},
  year         = {{2022}},
}

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