Effect of nitrogen rate on grain yield and grain oil concentration of canola— Canowindra 2014

Abstract

Key findings • Highest yielding variety was 45Y88 CL, 0.44 t/ha higher than the lowest yielding variety, ATR-Gem. • There was no significant interaction between variety and N response. • Hybrids were more N-use efficient than openpollinated varieties. • Soil N levels are likely to be lower following a hybrid canola compared to open-pollinated varieties. • Nitrogen applied at 40 kg N/ha produced maximum grain yield with a 0.24 t/ha benefit over the Nil N rate. • Oil concentration was reduced as N rate exceeded 40 kg N/ha. • Victory V3002 had significantly higher oil concentration than other varieties. • Total harvested oil was 181 kg/ha more with hybrids than open-pollinated varieties.