Spreading nitrogen and sulphur at the same time means more grass
Applying fertilisers containing nitrogen and sulphur means the grass uses nitrogen more effectively, you get more kgs of dry matter per kg of nitrogen that you apply
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Conclusion of foliar N trial on grass
There has been a great deal of interest over the last three years on the results of this foliar nitrogen (N) trial on grass, with this year’s yields back over 2 tonnes of dry matter on 2024, which is hardly any surprise.
The trial is modelled on a 4-cut silage system, with the first cut taking place in early May, with subsequent cuts taken every 5 weeks approximately. The total season N rate per ha for the 5 treatments is as follows: treatment 1 – 0 kg, treatment 2 – 340 kg (100% soil applied), treatment 3 – 203 kg (86% soil applied, 14% as a slow-release foliar N product), treatment 4 - 203 kg (100% soil applied), treatment 5 - 203 kg (28% soil applied, 72% as a foliar urea product + humic acid). The foliar N was applied 10 – 12 days after the previous cut to ensure there was enough leaf surface to intercept the foliar products.
2025 results - The total dry matter (DM) yield per ha was 2,358 kg, 9,978 kg, 7,415 kg, 7,231 kg and 7,182 kg of dry matter per ha for treatment 1, 2, 3, 4 and 5 respectively. The N response was 22.4 kg, 24.9 kg, 24.0 kg and 23.8 kg of dry matter per kg of applied N for treatment 2, 3, 4 and 5 respectively. In conclusion, although yields were different each year, we see the same trends each year between treatments. Foliar N was no more efficient than the same rate of N applied as a soil applied conventional solid fertiliser.
Grassland agronomy advice
The latest grassland fertiliser and nutrition advice from the Yara agronomists.
Recent grassland webinars
Advice on managing fertiliser inputs on first cut silage crops this spring
Philip Cosgrave, Yara's Grassland Agronomist is joined by Nicola Ingram and Nigel Mills, Yara Area Managers for UK and Ireland, to discuss a range of topics to help inform farmers on how best to manage fertiliser applications this spring on silage crops.
Yara and CAFRE Nutrients Action Programme (NAP) - Update for fertiliser distributors
In this webinar Philip Cosgrave, Yara Grassland Agronomist and Aveen McMullan, Senior Agricultural Technologist at CAFRE provide an update on the Nutrients Action Programme (NAP) regulations relating to the use and application of inorganic fertilisers and an explanation of the requirement for fertilisation plans.
How to get healthy grass and happy cows
In this webinar, Philip Cosgrave is joined by Conrad Ferris from AFBI to talk about the planning behind a successful spring grassland nutrition strategy.
How to manage lime and fertiliser on a livestock farm
In this webinar, Philip Cosgrave of Yara and Kevin Havekes of Kilwaughter Lime collaborate to give an insight into how lime and fertiliser work hand in hand.
Grass, milk and robots - webinar
Our grassland agronomy expert Philip Cosgrave joins Cormac Garvey from Lely for this webinar to discuss grazing systems for robotic milking, grassland management and grassland nutrition management.
How manage grassland fertilisation in simple steps
In this webinar, Jon Telfer, Philip Cosgrave and Nigel Hester talk through the steps needed for successful grassland fertilisation.
Listen to the latest grassland podcasts
If you are short of time why not check out our bite-size podcasts for the latest thoughts on grassland nutrition.
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