Wheat variety response to nitrogen management – Tamarang 2014

Abstract

Key findings • Lancer [PBR] appears to have good grain stability, achieving low screenings across both N rates and sowing dates, and was the variety with the highest grain nitrogen yield (GNY), showing good grain yield (GY) response to increasing N rates. • Spitfire [PBR] although lower yielding than Suntop [PBR], was due to its high grain protein concentration (GPC), still able to achieve a comparable GNY. EGA Gregory [PBR] due in part to its lower GPC and Dart [PBR] principally a result of its lower GY, were the varieties with the lowest GNY. • Variety selection played an important role, with the main season varieties Suntop [PBR], Lancer [PBR] and EGA Gregory [PBR] yielding well over both sowing dates. EGA Gregory [PBR] was however, less GY responsive to increasing rates of N application. • EGA Eaglehawk [PBR] was particularly impacted both in terms of GY and screenings with delayed sowing, and increasing N rates, failing to achieve grain receival screening standards of ≤ 5.0 %. Dart [PBR] and to a lesser extent Suntop [PBR] experienced screening issues with later sowing and increasing rates of N application.