William Dennehy
Overall Winner – Environmentally Sustainable Farmer of the Year 2026
Improving Water Quality Winner
Co. Kerry | Dairy Farmer
This high-EBI, compact spring-calving dairy herd in Co. Kerry places a strong emphasis on soil fertility, grass production and reducing farm emissions. In 2025, the farm grew 13.9 t DM/ha, recorded in Pasturebase, from just 157 kg chemical N/ha, with 98% of nitrogen applied as protected urea. This farm had an N Balance of 146 kg/ha in 2025. Clover is now present across 62% of the grazing platform, helping to reduce reliance on chemical N. While 4 ha of red clover silage provides high-quality feed. Milk solids production reached 497 kg/cow from just over 700 kg concentrates, with a carbon footprint of 0.94 kg CO₂e/kg FPCM. Herd EBI is €156, supported by targeted breeding and high-DBI beef sires.
Biodiversity and water quality measures include 500m of new hedgerow, native trees, river and drain buffer zones, and careful management of livestock near the Brown Flesk River. William has made good use of clover to reduce chemical N use. A reedbed installed in 2024 treats greywater. Soil fertility is monitored through regular testing, lime applications and precision slurry/fertiliser spreading. Solar PV and a battery system were installed, reducing electricity imports by around 30%.
