Teagasc Specialist Mark Plunkett, from the Signpost Programme, is on this week’s Beef Edge podcast to discuss fertiliser application for silage this year.  

As we move through a challenging spring, many farmers are reassessing their silage strategy. Weather disruption, fertiliser costs, and environmental pressures all mean that getting the basics right has never been more important. Mark outlines the importance of achieving high-quality silage while maintaining yields and controlling input costs.

Closing date is one of the most important drivers of silage quality. Earlier closing (late March to early April) results in higher digestibility and better feed quality, but typically lower yields. Delayed closing increases bulk but reduces DMD (dry matter digestibility), impacting animal performance.

Mark highlights how this spring, some ground may not be grazed before closing due to poor conditions. In these cases:

· Remove heavy covers early if possible through light grazing

· If not feasible, close, fertilise and harvest early May

· Avoid applying slurry on very heavy covers—this can lead to contamination

Mark explains that a typical fertiliser programme should aim to supply:

· Nitrogen (N): 80–100 units/acre (100–125 kg/ha)

· Phosphorus (P): 16 units/acre (20 kg/ha) where required

· Potassium (K): 80 units/acre (100 kg/ha), especially where silage is removed annually

Sulphur is often overlooked but is essential for nitrogen utilisation and good grass growth. Deficiency can limit yield even where nitrogen is applied. Including sulphur (10–15 units/acre) improves overall response.

Finally Mark highlights:

· Close remaining silage ground as soon as conditions allow

· Apply fertiliser promptly after closing

· Use slurry where conditions are suitable

· Monitor covers and plan cutting dates early

Timeliness is critical - delays now reduce both yield and quality.

For more episodes from the Beef Edge podcast, visit the show page at:
https://www.teagasc.ie/thebeefedge

 
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