Effect of nitrogen rate and application timing on yield and oil content of four canola varieties at Trangie and Nyngan 2013

Abstract

Key findings • The application of nitrogen fertiliser resulted in increased grain yield of all four canola varieties at both sites in 2013, even with moderate to high soil nitrogen levels at sowing. • Based on the response to nitrogen trials at Nyngan and Trangie in 2012 and 2013, canola growers should aim to apply at least 30 kg N/ha to achieve a grain yield response in central-western NSW. Current trial results suggest no difference between applying nitrogen at sowing or in-crop. • Although nitrogen application can increase grain yield, it may reduce oil concentration at high rates of nitrogen when applied to soils with relatively high starting soil nitrogen levels.