East Anglia ONE Offshore Windfarm Landscape Management PlanWork No 38 to 41


August, 2016


Table 6-5 Maintenance of Species Rich Grass Areas Species Rich Grass Maintenance


Cutting


1 Similar to wetland grass areas, meadow like habitats are characteristically quite variable in composition, reflecting local drainage and management.


2 First year management. Most of the sown species are perennial and will be slow to germinate. Avoid cutting in the spring and early summer if the mixture is autumn sown. Allow any annuals to flower, then in mid-summer cut and remove the vegetation.


3 In the second and subsequent years the grassland can be managed in a number of ways which, depending on soil fertility, will determine the character of the grassland. The best results are usually obtained by traditional meadow management based around a main summer cut in combination with an autumn and possibly spring cut.


4 Do not cut or graze from spring through to late July/August (to give the sown species an opportunity to flower). 5 After flowering in July or August cut to c 50mm. Leave the arisings to dry and shed seed for 1-7 days then remove from site. 6 Mow or graze the re-growth through to late autumn/winter to c 50mm and again in spring if needed.


7 Similar to wetland grass areas, meadow like habitats are characteristically quite variable in composition, reflecting local drainage and management.


Weed Control Weed control will be undertaken as necessary to include spot herbicide treatment or manual removal. Watering


Watering is unlikely to be required as the intention is to create a species rich grassland not dependent upon external manual watering or irrigation. However, should additional watering be required due to extremely unseasonal dry conditions, then the contractor will need to arrange for a mobile water bowser or tanker to bring the required clean water to site.


6.7 Topsoil Storage Mix (G4) 91.


A topsoil storage legume rich grass mix (G4) will be used to stabilise long term top soil storage and to ensure valuable nitrogen is fixed within the soil, helping to support growth of other grasses. The sward can also be ploughed back in to improve soil structure.


Table 6-6 Maintenance of Topsoil Storage Topsoil Storage Maintenance Cutting


The emergent grass sward will be mown or strimmed initially to a cutting height of 50mm to promote tillering of the grasses. This will in turn both stabilise the soil surface and restrict opportunities for weed species to invade the sward. The sward will subsequently be mown to a height of 50mm once in April/May and again in August/September during the construction period, unless growth rates or climatic conditions indicate otherwise.


Weed Control


At all times during the site working and restoration programme good agricultural practice will be used to contain weed growth and the appropriate herbicide will, if required, be applied in accordance with manufacturers’ recommendations. Weed control will be undertaken as necessary to include spot herbicide treatment or manual removal. Any areas of failed grass will be cultivated and reseeded in the next seeding season.


Watering


Unlikely to be required as the intention is to create a temporary grass sward not dependent upon external manual watering or irrigation. However, should additional watering be required due to extremely unseasonal dry conditions, then the contractor will need to arrange for a mobile water bowser or tanker to bring the required clean water to site.


East Anglia ONE – EA1-CON-F-GBE-008554


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