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  1. Article ; Online: Impact of diversified cropping systems and fertilization strategies on soil microbial abundance and functional potentials for nitrogen cycling.

    Liu, Bei / Ahnemann, Hauke / Arlotti, Donatienne / Huyghebaert, Bruno / Cuperus, Fogelina / Tebbe, Christoph C

    The Science of the total environment

    2024  Volume 932, Page(s) 172954

    Abstract: Diversified cropping systems and fertilization strategies were proposed to enhance the abundance and diversity of the soil microbiome, thereby stabilizing their beneficial services for maintaining soil fertility and supporting plant growth. Here, we ... ...

    Abstract Diversified cropping systems and fertilization strategies were proposed to enhance the abundance and diversity of the soil microbiome, thereby stabilizing their beneficial services for maintaining soil fertility and supporting plant growth. Here, we assessed across three different long-term field experiments in Europe (Netherlands, Belgium, Northern Germany) whether diversified cropping systems and fertilization strategies also affect their functional gene abundance. Soil DNA was analyzed by quantitative PCR for quantifying bacteria, archaea and fungi as well as functional genes related to nitrogen (N) transformations; including bacterial and archaeal nitrification (amoA
    Language English
    Publishing date 2024-05-07
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2024.172954
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  2. Book ; Online: Establishing summer cover crops before winter cereals in low tillage systems on sandy soils (DiverIMPACTS Practice Abstract)

    Ahnemann, Hauke / Meyer, Hendrik

    2022  

    Abstract: Fast growing cover crops, even in the available short period, stabilise cash crop yields by adding organic matter to the rooted zone of the soil, increasing soil water infiltration. The crop cover also protects the soil from direct sun radiation, ... ...

    Abstract Fast growing cover crops, even in the available short period, stabilise cash crop yields by adding organic matter to the rooted zone of the soil, increasing soil water infiltration. The crop cover also protects the soil from direct sun radiation, reducing surface temperatures drastically. At the same time, we can secure left-over nitrogen from the previous crop in different rootingzones by using mixtures of cover crops with diverse rooting systems, as well as gaining the protective value of plant vegetative and residue cover for controlling soil erosion [CLARK, 2008].
    Keywords Crop combinations and interactions
    Language English
    Publishing country dk
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Crop diversification improves the diversity and network structure of the prokaryotic soil microbiome at conventional nitrogen fertilization

    Liu, Bei / Schroeder, Julia / Ahnemann, Hauke / Poeplau, Christopher / Tebbe, Christoph C.

    2023  

    Abstract: Background Sustainable agriculture seeks to optimize the application of nitrogen (N) fertilizers to reduce adverse economic and ecological effects. Crop diversification has been proposed to increase the efficiency of N fertilization. An open question is ... ...

    Abstract Background Sustainable agriculture seeks to optimize the application of nitrogen (N) fertilizers to reduce adverse economic and ecological effects. Crop diversification has been proposed to increase the efficiency of N fertilization. An open question is how the soil microbiome responds to these beneficial practices. Methods In a field study we investigated the effects of mineral N fertilizer with a 0-control, a conventional amount of 150 kg N ha−1 and an excessive application of 250 kg N ha−1 on the soil microbiome within a diversified cropping system with oil radish and undersown ryegrass over a period of 2.5 years and a non-diversified control, both in rotation of potato, winter rye and maize. Results N-fertilizations and crop rotations altered the pH, but differences were less pronounced with the diversified system. Compared to the crop species and season, N fertilization and crop diversification had less influence on the abundance of soil bacteria, archaea and fungi. The crop diversification showed a much stronger effect on archaeal than on bacterial or fungal abundances, while the microbial carbon use efficiency correlated strongly with bacterial abundance. At the end of the growing seasons, crop diversification increased prokaryotic richness and Shannon diversity in response to N addition, with a greater increase in the conventional N. At conventional N supply, prokaryotic co-occurrence networks revealed a much denser and complex structure in the diversified system. Conclusions The diversified cropping system under conventional N application rates showed positive effects on the prokaryotic soil microbiome by increasing their richness, Shannon diversity, and promoting a more elaborated network structure.
    Keywords article ; Text ; ddc:630 ; ddc:550 ; 16S rRNA genes ; Cover crop ; Excessive nitrogen fertilization ; Prokaryotic communities ; Soil DNA
    Subject code 630
    Language English
    Publisher Springer
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Book ; Online: Increasing feed production using legume and cereal mixtures as a second crop (DiverIMPACTS Practice Abstract)

    Vandewalle, Aline / Guibert, Stéphanie / Thiechard, Marion / Guérin, Fabien / Ahnemann, Hauke

    2021  

    Abstract: Improved feed diversity and more resilient feed production, less dependent on soybean imports. This strategy helps to mitigate droughts effects, through an “avoidance strategy”, with production of forage during seasons less likely to be affected by such ... ...

    Abstract Improved feed diversity and more resilient feed production, less dependent on soybean imports. This strategy helps to mitigate droughts effects, through an “avoidance strategy”, with production of forage during seasons less likely to be affected by such phenomenon. Other benefits include improved soil biodiversity and soil health, reduced leaching during winter (as mixtures are used as cover crops) and benefits associated with incorporating residues from roots and crops (nitrogen availability for maize, carbon input to the soil, etc.).
    Keywords Crop combinations and interactions ; Cereals ; pulses and oilseeds
    Language English
    Publishing country dk
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Effects of temporal crop diversification of a cereal-based cropping system on generalist predators and their biocontrol potential

    Puliga, Giovanni Antonio / Thiele, Jan / Ahnemann, Hauke / Dauber, Jens

    2021  

    Abstract: In agroecosystems, crop diversification plays a fundamental role in maintaining and regenerating biodiversity and ecosystem services, such as natural pest control. Temporal diversification of cropping systems can affect the presence and activity of ... ...

    Abstract In agroecosystems, crop diversification plays a fundamental role in maintaining and regenerating biodiversity and ecosystem services, such as natural pest control. Temporal diversification of cropping systems can affect the presence and activity of natural enemies by providing alternative hosts and prey, food, and refuges for overwintering. However, we still lack studies on the effects of temporal diversification on generalist predators and their biocontrol potential conducted at field scale in commercial agricultural settings. Here, we measured proxies of ecosystem functions related with biological pest control in 29 commercial agricultural fields characterized by cereal-based cropping system in Lower-Saxony, northern Germany. The fields differed in the number of crops and cover crops cultivated during the previous 12 years. Using the Rapid Ecosystem Function Assessment approach, we measured invertebrate predation, seed predation and activity density of generalist predators. We aimed at testing whether the differences in the crop rotations from the previous years would affect activity of predators and their predation rates in the current growing season. We found that the length of the crop rotation had neutral effects on the proxies measured. Furthermore, predation rates were generally lower if the rotation comprised a higher number of cover crops compared to rotation with less cover crops. The activity density of respective taxa of predatory arthropods responded differently to the number of cover crops in the crop rotation. Our results suggest that temporal crop diversity may not benefit the activity and efficiency of generalist predators when diversification strategies involve crops of very similar functional traits. Adding different resources and traits to the agroecosystems through a wider range of cultivated crops and the integration of semi-natural habitats are aspects that need to be considered when developing more diverse cropping systems aiming to provide a more efficient natural pest control.
    Keywords Text ; ddc:580 ; biocontrol potential -- crop diversification -- dummy caterpillars -- generalist predators -- Rapid Ecosystem Function Assessment (REFA)
    Subject code 571
    Language English
    Publishing date 2021-10-15
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Evaluating effects of cropping-systems diversification on biocontrol potential using Rapid Ecosystem Functions Assessment methods

    Puliga, Giovanni Antonio / Thiele, Jan / Ahnemann, Hauke / Dauber, Jens

    2019  

    Keywords Text ; ddc:630
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: An Actor-Oriented Multi-Criteria Assessment Framework to Support a Transition towards Sustainable Agricultural Systems Based on Crop Diversification

    Iocola, Ileana / Angevin, Frederique / Bockstaller, Christian / Catarino, Rui / Curran, Michael / Messéan, Antoine / Schader, Christian / Stilmant, Didier / Van Stappen, Florence / Vanhove, Paul / Ahnemann, Hauke / Berthomier, Jérémy / Colombo, Luca / Dara Guccione, Giovanni / Mérot, Emmanuel / Palumbo, Massimo / Virzì, Nino / Canali, Stefano

    2020  

    Abstract: Crop diversification represents a key lever to support the development of sustainable agri-food systems. Knowledge on trade-offs and carry over effects from different crop diversification strategies is essential to inform agricultural stakeholders of ... ...

    Abstract Crop diversification represents a key lever to support the development of sustainable agri-food systems. Knowledge on trade-offs and carry over effects from different crop diversification strategies is essential to inform agricultural stakeholders of potential costs and benefits. This knowledge is limited by existing data and performance measures predominantly focused on single crops, rather than complete rotations. Moreover, sustainability performance indicators are often used for assessment purposes, rather than supporting stakeholder learning and actions. A new set of 32 indicators was developed to address these needs, and used to evaluate the environmental, economic and social sustainability of the diversified agricultural systems highlighted in the case studies, which are often characterized by data availability constraints. This approach was tested in France, Germany and Italy to determine a critical ex-post diagnosis of the existing systems, and for the assessment of ex-ante innovative scenarios. The results will be used to support these case studies in the identification and design of more sustainable agricultural systems. Although the framework is based on feasible and proxy indicators, the assessment outcomes have allowed local actors to reflect on the effects generated by the implemented crop diversification strategies. Key issues include trade-offs occurring between optimizing economic and environmental performance.
    Keywords Biodiversity and ecosystem services ; Breeding ; genetics and propagation ; Policy environments and social economy
    Subject code 650
    Language English
    Publishing country dk
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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