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Strategic timing of nitrogen fertilization to increase root biomass and nitrogen-use efficiency of Lolium perenne L von de Boer, H.C., Deru, J.G.C., Hoekstra, N.J., van Eekeren, N.

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Sward lifting in compacted grassland: Contrasting effects on two different soils von De Boer, H.C., Deru, J.G.C., Van Eekeren, N.

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Genetic differences in root mass of Lolium perenne varieties under field conditions von Deru, J.G.C, Schilder, H, Schoot, J.R., van der, Eekeren, N.J.M., van

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