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Degree Days to 50% Flowering for 12 Cultivars of Spring Canola-like Mustard

K. M. Hunter, D. W. Archer, R. W. Gesch, M. F. Vigil, J. L. Hatfield, B. L. Allen, J. D. Jabro, S. Kim, M. N. Meki, J. R. Kiniry
Journal of Agriculture and Ecology Research International 2017 v.11 no.4 pp. 1-8
canola, cultivars, ecology, flowering, genetics, geographical variation, heat, heat sums, latitude, models, planting, temperature, Great Plains region
Previous growth modeling efforts for canola simulations have been based on the growth parameters previously established in the Northern Great Plains. However, with advances in canola genetics, establishing parameters for newly developed cultivars is essential for best modeling projections. The null hypothesis for the present study was that the summed degree day (SDD) to flowering for cultivars of canola-like mustards would have relatively stable values across a wide range of North American latitudes, simplifying modeling research. The alternate hypothesis was that the cultivars studied would differ in their SDD among regions and among cultivars. We focused this research on the temperatures from each location from planting to the date of 50% flowering to calculate summed degree days (SDD). It appears that the SDD for each of these mustard cultivars is fairly stable and similar to the potential heat units already established for B. rapa (Polish canola) in 1995.