17 research outputs found
Apparent vernalization requirement of high yielding spring wheat
Get PDFNon-Peer ReviewedControlled environment studies have demonstrated that the high yield potential of certain spring wheat (Triticum aestivum L.) cultivars may result from a moderate vernalization requirement. The objective of this study was to determine whether apparent vernalization responses of cultivars could be detected when
comparing the development of early and late-seeded crops. The effect of delayed seeding on 9 or 10 spring wheat cultivars was studied at Saskatoon over a period of four years. Within years, the earliest and latest dates of seeding differed by a minimum of 22 days. Vernalization effects were apparent in 1983 and 1986 but not in 1985 and 1987. In 1983 and 1986 Growing Degree Day accumulation 14 days after seeding (GDD14) averaged 44 for the earliest date of seeding compared to 120 GDD or more for the later seeding dates. However, the GDD14 for the earliest date of seeding was 121 in 1985 and 134 in 1987. Apparent vernalization effects were manifested by higher main stem leaf number, increased spikelet production and delayed spike emergence. Cultivars were ranked in the following order for apparent vernalization sensitivity: Fielder = Pitic 62 > HY402 > HY320 > Genesis > HY912 > Leader > Glenlea > Neepawa > Katepwa > Siete Cerros > Potam. Fielder had the greatest vernalization requirement and Potam the least. On average, delayed seeding resulted in increased grain yields, but this observation was not consistent over years
Performance of standard height and semidwarf durum wheat cultivars under irrigation
Get PDFNon-Peer ReviewedTall, intermediate, and semidwarf durum cultivars and experimental lines (22 in total) were evaluated at two irrigated sites in 1987. Both tall and intermediate height classes out-yielded the semidwarf group by a significant margin. The standard height durums had a protein content in the 15-16 % range. Starchy kernel content was low at both sites. Smudge and immature kernels resulted in lower CWAD grades but returns from growing durum would still have been greater than that obtained from a CWRS crop. These preliminary results suggest that there is potential for irrigated production of intermediate height cultivars such as Sceptre, Arcola, and Medora
Impact of introducing alien storage proteins on the bread-making quality and agronomic performance of spring wheat
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Differential competitive ability of morphologically diverse spring wheat genotypes
Get PDFNon-Peer ReviewedSixteen genotypes of common spring wheat (T. aestivum) were grown under conditions of simulated weed competition at Saskatoon in 1991 and 1992. Weeds consisted of cultivated oat (Avena sativa cv. Waldern) and Oriental mustard (Brassica juncea cv. Cutlass) sown at two densities (48 and 96 seeds m2 per weed species), and a weed free control. Seedling establishment, % ground cover, and seed yield for all three species was recorded as was wheat tiller number, spike number, maximum height, LAI (Ieaf area index), leaf orientation, and flag leaf length and size. Significant (p =0.01) weed rate by genotype interactions involving changes in genotype rank were detected for grain yield, indicating differences in competitive ability existed among the wheat genotypes. The highest yielding genotypes under weed free conditions were not necessarily the highest yielding under weedy conditions. Yield reductions averaged over two weed densities ranged from 36 to 52 %. Genotypes which exhibited lower yield reductions also showed greater suppression of weed growth. Although competitive genotypes were generally taller than non-competitive genotypes, other traits such as tillering capacity and leaf length were important determinants of competitive ability
Evaluation of a putatively very high yielding "miracle" spring wheat
Get PDFNon-Peer ReviewedA supposedly very high yielding branched spike wheat (BSW) was shown to yield as much as 75 % less than standard Canada Western Red Spring (CWRS) cultivars when severely infected with leaf and stem rust. With little or no disease pressure BSW still yielded 25-30% less than semi-dwarf wheat cultivars under both dryland and irrigated conditions. The BSW was very tall and later maturing than HY 320. Kernel and quality characteristics of BSW would appear to limit its market potential regardless of yield
Evaluation of a putatively very high yielding "miracle" spring wheat
Get PDFNon-Peer ReviewedA supposedly very high yielding branched spike wheat (BSW) was shown to yield as much as 75 % less than standard Canada Western Red Spring (CWRS) cultivars when severely infected with leaf and stem rust. With little or no disease pressure BSW still yielded 25-30% less than semi-dwarf wheat cultivars under both dryland and irrigated conditions. The BSW was very tall and later maturing than HY 320. Kernel and quality characteristics of BSW would appear to limit its market potential regardless of yield
