PERIODS WHEN APPLICATION OF FERTILISERS TO LAND IS PROHIBITED In County Mayo the period during which the application of fertilisers to land is prohibited is the period from— (a) 15 September to 15 January in the case of the application of chemical fertiliser (b) 15 October to 15 January in the case of the application of organic fertiliser (other than farmyard manure but including slurry, soiled water, silage effluent ) (c) 1 November to 15 January in the case of the application of farmyard manure. The Following Buffer Zones apply for the spreading of organic manure. It is important to point out buffer zones to your agriculture contractor before spreading. Buffer zone Watercourse (stream, River) Dry open drains Lake shoreline Water for human consumption Water supply for 50+ people Water supply for 500+ people If on a slope of more than 10% towards water course (example: 1m drop in 10m) Spreading organic manure 5 metres 3 metres 20 metres 25 metres 100 metres 200 metres 10 metres Stockpiled Farmyard Manure 10 metres 10 metres 20 metres 50 metres 250 metres 250 metres 10 metres