January 25, 2021 12:00 pm Nitrogen (N) is the major nutrient required by grass and is often strategically used to increase grassland yields. Teagasc research has shown that every 1kg of N applied in early spring produces in the region of 10kg dry matter (DM) of grass. The key to achieving high yields is to apply the correct amount of N, from the right source at the right time. Take a look at Target Fertiliser’s Q&A below: What application rate of N should I use? The general rule of thumb is to apply 30kg/ha or 24 units of N on the first application which equates to a half bag of urea or one bag of calcium ammonium nitrate (CAN) +/- sulphur (S).