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Nitrogen Use Efficiency and Nitrogen Uptake of juncea Canola under Diverse Environments

^a Semiarid Prairie Agric. Res. Centre, Agric. and Agri-Food Canada, P.O. Box 1030, Airport Rd. East, Swift Current, SK S9H 3X2, Canada
^b Melfort Res. Farm, Agric. and Agri-Food Canada, Box 1240, Melfort, SK S0E 1A0, Canada
^c Scott Res. Farm, Agric. and Agri-Food Canada, Box 10, Scott, SK S0K 4A0, Canada
^d Saskatoon Res. Centre, Agric. and Agri-Food Canada, 107 Science Pl., Saskatoon, SK S7N 0X2, Canada
^e 142 Rogers Rd., Saskatoon, SK S7N 3T6, Canada

View larger version (14K): [in this window] [in a new window]   Fig. 1. Polynomial regression trend lines of N use efficiency (NUE = seed yield/(Nt + Nf); where Nt equals N derived from soil as determined by N uptake in seed + straw in zero-N control, and Nf equals amount of N from applied fertilizer) on N fertilizer rates at environmental sites with (A) low, average, and high levels of Nt and (B) low, average, and high June–July rainfall. The unit of yield is in kg seed ha–1 and the unit of N supply is in kg N ha–1 (this is also applicable to Fig. 2, 3, and 4). The data were averages of five oilseed crops across 11 sites (location x year combinations) in Saskatchewan, Canada, 2003 to 2005.

View larger version (29K): [in this window] [in a new window]   Fig. 2. Polynomial regression trend lines for N use efficiency (NUE = seed yield/(Nt + Nf); where Nt equals N derived from soil as determined by N uptake in seed + straw in zero-N control, and Nf equals amount of N from applied fertilizer) on N fertilizer rates at environmental sites with (Left) low, average, and high levels of Nt and (Right) low, average, and high June–July rainfall, for the five oilseed crops across 11 sites (location x year combinations) in Saskatchewan, Canada, 2003 to 2005.

View larger version (27K): [in this window] [in a new window]   Fig. 3. Polynomial regression trend lines for the seed N uptake variable at sites with low-, average-, and high-levels of Nt (graphs on the left) and of June–July rainfall (graphs on the right), for five oilseed crops across 11 sites (location x year combinations) in Saskatchewan, Canada, 2003 to 2005.

View larger version (39K): [in this window] [in a new window]   Fig. 4. Biplot (mean vs. CV) for crop species x N fertilizer rate combination treatments for data collected across 11 sites (location x year combinations) in Saskatchewan, Canada, 2003 to 2005. The letter on the label of the data point indicates crop cultivars (AC = AC-Base alba mustard, Am = Amulet juncea canola, C = Cultlass juncea mustard, H = Hysyn 110 rapa canola, and I = InVigor 2633 napus canola) and the following number indicates the N fertilizer rate. For example, the data point ‘H50’ means the cv. Hysyn 110 at 50 kg N ha–1. A number closely clustered or clustered near the origin were not labeled.