Rotational conservation headlands support open-structured cereal crops with broad-leaved arable plants.
This is achieved by keeping an area of cereal crops free from broadleaf herbicides and insecticides.
By allowing the natural development of a variety of plants within the headland, feeding grounds and habitat for arable plants, pollinating insects, small mammals and brown hares are created. For farmland birds, this measure can benefit grey partridges, linnets, bullfinches, corn buntings, yellowhammers, reed buntings and skylarks.
The headland area can be harvested with the rest of the crop, but is ideally left to provide a standing crop which will then provide seed-rich habitat throughout winter.
Conservation headlands in appropriate places can support small populations of broad-leaved plants, which have little competitive impact on the crops. Arable plants are the fastest declining group of plants in the UK and can thrive where they are allowed to germinate and establish free from herbicides.
The arable plants in conservation headlands can provide valuable pollen and nectar for insect pollinators and predators of pests. The boost in insect numbers and the prolific seed production of broad-leaved arable plants provides valuable food for farmland birds, particularly grey partridges and turtle doves, but also linnets, corn buntings, yellowhammers and skylarks.
Unharvested cereal headlands can help feed farmland birds through the hungry gap in the winter and early spring, when they can often struggle to find sufficient food.
By avoiding the use of insecticides, many of the beneficial insects on farms which move into fields after over-wintering in hedges, tussock grasslands and field margins are protected. The overall impact of conservation headlands is to improve populations of beneficial insects in the crop margins as well as the crop itself.
This management is most suited to light soils which do not have high levels of competitive weeds such as cleavers or barren brome. Sites which are known to support rare arable plants are also ideal and may even be considered on farms with a higher weed burden. They are best placed near to tussocky grass margins or hedges to maximise the benefits for beneficial insects.
Between February and April, sow a cereal crop of wheat, barley, triticale, oats or rye at a lower seed rate of 50-100kg/ha. This will ensure that the crop isn't too dense and will provide open habitat for broad-leaved plants. This can be either in 6-24m strips or at the field scale. It may be useful to avoid applying fertiliser to the conservation headlands area, to reduce the risk of competitive grasses and cleavers dominating at the expense of the less competitive broad-leaved arable plants.
To maximise the seed-rich resource for farmland birds, retain the unharvested strip as a weedier strip of standing crop. The cereals can be harvested with the rest of the crop, but preferably without the use of a pre-harvest desiccant. This is especially important where the subsequent stubble can be retained over winter to provide weed seeds for farmland birds.
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