Factorial experiments were conducted at two locations in Quebec to measure the combined effects of cover crop (CC) (mix of red (Trifolium pratense L.) and white clover (Trifolium repens L.)), fertilizer type (mineral (27-0-0) or organic (pig slurry)), and N rate (0, 50, 100, 150 kg nitrogen (N) ha -1 ) on canola (Brassica napus L.) yield and N uptake in a split-plot design reproduced twice (2013)(2014)(2014)(2015) at each location.At Ckilling, the clover biomass contained 28 to 151 kg N ha -1 . Cover cropping did not change canola N uptake, but increased yield and had mineral fertilizer replacement value of 22 to 82 kg N ha -1 . Without N fertilizer application, the CC increased canola yields by 6 to 42%, the effect diminishing with increasing fertilizer N rate. Canola N uptake and yield were lower with pig slurry, compared to the mineral fertilizer. Maximum canola yield was reached at rates of 120 kg N ha -1 and higher with the mineral fertilizer.
RésuméUne expérience factorielle a été réalisée à deux sites au Québec pour mesurer les effets
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