Kırmızı Yonca Çeşidi ve Kimyasal Azot Gübrelemesinin Mera Üretimi ve Yonca İçeriği Üzerindeki Etkisi

Özet (abstract)

Red clover ( Trifolium pratense L.; RC) inclusion in perennial ryegrass ( Lolium perenne L.; PRG) silage swards reduces nitrogen (N) fertiliser requirements; however, maintaining production over time remains challenging. Effects of RC variety, N fertiliser rate, and location on herbage production and RC content of PRG-RC silage swards were evaluated over three years. Eight RC varieties were sown with PRG at two Irish sites (Moorepark, Co. Cork and Grange, Co. Meath) with three N rates (0, 75 and 150 kg N/ha/year; 0 N, 75 N, 150 N). Plots were harvested three times annually. In Year 1, herbage production (mean ± SE; 17693 ± 460 kg dry matter (DM)/ha) and RC content (563 ± 27.0 g/kg DM) did not differ among varieties. By Year 3, both declined on average, but Aberclaret and Fearga maintained the highest yields (12524 ± 460.3 kg DM/ha) and the same RC content (563 ± 27.0 g/kg DM). Cut 1 herbage production was greatest with 75 N in Years 1 and 2 and 150 N in Year 3, when RC content had declined. Cut 1 RC content did not differ among N rates, while for Cut 2 and 3, N reduced RC content and had no production benefit except in Year 2 (75 N). Herbage production was 15% greater and RC content 46% lower at Grange vs Moorepark. Results highlight significant variation among RC varieties in production across years and indicate that targeted N fertiliser use can enhance yields when RC content is low. Findings underscore the importance of multi-site, multi-year RC variety evaluations.

Yazarların özeti; kaynağından alınmıştır. European Journal of Agronomy, 2026 · DOI ↗