Short-term rotational fallows, new set-asides and seed mixtures containing specific seed-bearing crops are best alternative to provide seed food for farmland birds (Hyvönen & Huusela-Veistola 2011). The age of set-aside and vegetation structure are more important than seed mixture or plant species richness in supporting insect food for birds, and therefore set asides of various ages are needed (Hyvönen & Huusela-Veistola 2011). Even a short-term fallow sown with a simple seed mixture can encourage populations of generalist predators (Huusela-Veistola & Hyvönen 2006), but longterm set-asides may be even better for natural enemies (Huusela-Veistola 2008). Because of the various species requirements numerous habitats are needed if biodiversity is to be increased or maintained. At the landscape level, the proportion and location of non-crop temporal habitats may be important factors for key ecosystem services. Therefore, temporal habitats, e.g. set-asides, of various ages and different vegetation structures should be included in the agricultural landscape to encourage optimum functional biodiversity
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