Abstract
Background and aims
Mixing grasses with N2-fixing legumes benefits grassland yields. We examined if grass/forb/legume mixtures combining species with complementary vertical and temporal nutrient capture further promote nutrient yields and improve fertilizer N recovery.
Methods
Four species differing in N2-fixing ability and in vertical and temporal nutrient capture were grown in monoculture and two- and four-species mixtures. 15N was used to examine vertical complementarity in nutrient capture and fertilizer N recovery. Asynchrony was quantified from the N yield distribution over the year.
Results
The positive mixture effects on N and P yields (P < 0.001) between species contrasting in vertical and temporal nutrient capture (with same N2-fixing ability) were of a similar magnitude (+45 kg N) as those between N2-fixing and non-fixing species with shallow roots (+52 kg N). Mixture benefits were maximized up to +99 kg N when constituent species differed in N2-fixing ability and vertical and temporal nutrient capture. Species modified their vertical N capture when grown in mixture (niche shift). Remarkably, mixing Trifolium pratense and Cichorium intybus, which were similar in both vertical and temporal nutrient capture, generated negative mixture effects. The 4-species mixture captured as much fertilizer N as the grass monoculture, despite significant abundance of legumes.
Conclusions
Combining species differing in multiple characteristics for nutrient capture optimizes nutrient capture of non-legume/legume-mixtures.
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Acknowledgements
The research leading to these results received funding from the European Community’s Seventh Framework Program (FP7/ 2007-2013) under the grant agreement FP7-244983 (MULTISWARD). NH was funded by the Irish Research Council, co-funded by Marie Curie Actions under FP7.
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Husse, S., Lüscher, A., Buchmann, N. et al. Effects of mixing forage species contrasting in vertical and temporal nutrient capture on nutrient yields and fertilizer recovery in productive grasslands. Plant Soil 420, 505–521 (2017). https://doi.org/10.1007/s11104-017-3372-0
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DOI: https://doi.org/10.1007/s11104-017-3372-0