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Brassica juncea Canola in the Northern Great Plains

Responses to Diverse Environments and Nitrogen Fertilization

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

View larger version (24K): [in this window] [in a new window]   Fig. 1. Nonlinear regression output for (A) seed and (B) straw yields produced by alba mustard (cv. AC Base), juncea canola (cv. Amulet), juncea mustard (cv. Cutlass), rapa canola (cv. Hysyn 110), and napus canola (cv. InVigor 2663). The data were collected from 11 sites (location x year combinations) in Saskatchewan from 2003 to 2005. The trend lines were derived from predictions associated with the nonlinear regression coefficients, and the vertical dash line indicates the recommended rate of N fertilizer (80 kg N ha–1) for oilseed production under normal growing conditions.

View larger version (31K): [in this window] [in a new window]   Fig. 2. Summary of the nonlinear regression coefficients (a, intercept; b, linear slope coefficient; c, quadratic slope coefficient; join point, N fertilizer rate at which the plateau begins; plateau, upper asymptote) for seed and straw yield produced by alba mustard (cv. AC Base), juncea canola (cv. Amulet), juncea mustard (cv. Cutlass), rapa canola (cv. Hysyn 110), and napus canola (cv. InVigor 2663). The data were collected from 11 sites (location x year combinations) in Saskatchewan from 2003 to 2005. The horizontal error bars represent confidence intervals for coefficient estimates; error bars that do not overlap are significantly different at (P < 0.05).

View larger version (44K): [in this window] [in a new window]   Fig. 3. Biplot (means vs. CV) of crop type x N fertilizer rate combinations for data collected at 11 sites (location x year combinations) in Saskatchewan from 2003 to 2005. The first letter of the data point labels indicates crop type (am, alba mustard; jc, juncea canola; jm, juncea mustard; rc, rapa canola; nc, napus canola) and the following number indicates the N fertilizer rate. A number closely clustered or clustered near the origin was not labeled. The large open triangle symbols in each graph represent the mean values for each crop averaged across N rates. Group I, high yield, low variability (optimal); Group II, high yield, high variability; Group III, low yield, high variability (poor); Group IV, low yield, low variability. DAS, days after seeding.

View larger version (39K): [in this window] [in a new window]   Fig. 4. Best linear unbiased predictor estimates for seed and straw yield deviations of the intercept and linear slope coefficient estimates for each crop type (or crop type group) relative to the overall estimate across sites (location x year combinations). Statistical significance of deviations for each crop type/group at a particular site is indicated as follows: * = 0.05 P 0.01, and ** = P < 0.01.