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Fontaine, Doline; Kristensen, Rebekka Kjeldgaard; Rasmussen, Jim; Eriksen, Jørgen
Data in brief 42Journal Article
This article presents the data obtained from a field experiment in which grass-clover leys were fertilized with increasing N rates applied in either mineral N fertilizer and/or cattle slurry forms. The leys were composed of a 2-species mixture of white clover ( .) and ryegrass ( .) and a 4-species mixture of white clover, red clover ( .), festulolium ( ) and ryegrass. In total, eighty fields were established at two farm sites in the western part of Denmark on sandy soils and monitored for two herbage seasons (2018-2019). Dry matter yield, botanical composition, N concentration and the proportion of N derived from the atmosphere using the 15 N dilution method were recorded in the harvestable biomass after each cut. Furthermore, the specific growth, N uptake and quantitative biological N fixation of the species were determined. The dataset can be used to establish the N balance, to calculate the optimal economic fertilization rate based on grass-clover composition and to predict N leaching and residual effect. The data presented were thoroughly used and discussed in the research article "Contrasting effects of slurry and mineral fertilizer on N fixation in grass-clover mixtures".
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