Nitrogen response of eight wheat varieties – Nyngan 2015

Abstract

Key findings • This site was only moderately responsive to nitrogen (N) application. Yield and protein generally increased in all varieties with the 20 kg N/ha and 40 kg N/ha rates. However, yield decreased with higher application rates. • Protein and screening levels increased with N rates above 40 kg N/ha. • Kiora[PBR] produced the highest screening levels. The sowing date of 5 May at Nyngan is probably a bit late for Kiora[PBR], which would have exacerbated screenings. • Varieties with comparatively lower biomass such as Dart[PBR], Lancer[PBR], Spitfire[PBR] and Sunmate[PBR] maintained higher yield and lower screening levels even with the higher N application rates with a corresponding lower impact on harvest index also observed in these varieties.