Effects of early spring N-fertilisation strategies on grass production and nitrogen recovery

Application rate and application date of fertiliser nitrogen (N) are important factors determining grass production response N recovery by grassland in spring. This study was conducted at two sites with different soil types (sandy loam clay loam) Ireland spring 2005 2006. In comparison a non-fertilised (zero-N) control, urea applied rates 60 90 kg N/ha either as single or split applications on eight dates ranging between 11 January 14 March. Grass harvested four occasions 21 February 25 April. Split provided the best outcome relation to DM production, apparent (ARFN) cost additional produced compared applications. Likewise, this optimum commence combined second 26 terms cost-effectiveness input increase production.