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Production Paper

Topography and Management of Nitrogen and Fungicide Affects Diseases and Productivity of Canola

Agric. and Agri-Food Canada, Box 1240, Hwy. 6 South, Melfort, SK, Canada S0E 1A0

^* Corresponding author (kutcherr{at}agr.gc.ca)

Received for publication May 1, 2004. Successful application of precision agriculture technology requires information on crop response to many factors including fertilization and disease management. Field experiments were conducted on a hummocky landscape in the northern prairies to determine effects of slope (SL) position, N fertilization, and fungicide (FU) application on disease incidence, biomass yield, and seed yield, quality, N uptake, and recovery of applied fertilizer N for canola (Brassica napus L.). As N rate was increased, blackleg [Leptosphaeria maculans (Desmaz.) Ces. & De Not] disease incidence, biomass yield, and seed yield, protein content, N uptake, and percentage green increased while emergence, thousand-seed weight, and seed oil content and recovery of fertilizer N declined. The response of seed yield to N fertilization was relatively greater at upper than at the lower SL position, indicating the fertilizer N requirement for optimum seed yield was less at lower (71 kg N ha^–1) than upper (88 kg N ha^–1) SL. The upper SL had higher blackleg incidence and seed oil content than the lower SL. Therefore, FU application to control blackleg tended to be more beneficial for high N rates at the upper SL position. Sclerotinia stem rot [Sclerotinia sclerotiorum (Lib.) de Bary] did not appear to vary between management units. The results indicate some potential to use precision agriculture based on topography to guide disease control and N fertilizer strategies although each disease must be considered individually and with consideration for other management practices and environmental conditions.

Abbreviations: BBCH, Bayer, BASF, Ciba-Geigy, and Hoechst (growth stage scale) • FU, fungicide • %GS, percentage green seed • SL, slope • TSW, thousand-seed weight

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				H. R. Kutcher, S. S. Malhi, and K. S. Gill Slope Position, Nitrogen Fertilizer, and Fungicide Effects on Diseases and Productivity of Wheat on a Hummocky Landscape Agron. J., September 19, 2005; 97(5): 1452 - 1459. [Abstract] [Full Text] [PDF]