Well-rotted farmyard manure (stored for at least twelve months) may be applied at a rate of no more than 10 tonnes / ha once every two years.
Gellir defnyddio tail buarth sydd wedi'i chylchdroi'n dda (sydd wedi'i storio am o leiaf deuddeg mis) ar gyfradd o ddim mwy na 10 tunnell / yr hectar unwaith bob dwy flynedd.