Effect of varying seeding rates on hybrid and conventional summer rape performance in Manitoba

Abstract

To compare the effects of varying seeding rate on the agronomic performance, phenology and seed quality of hybrid and conventional summer rape cultivars. fbur hybrid and two conventional summer rape cultivars were seeded at 1.5,3.0,4.5,6.0 and 9.0 kg ha 'at two locations fbr 3 yr. The hybrid cultivars were, very imponantly .24vo hither yielding and pruluced 50% more toual dry manei than the ionventional cultivars.The hybrid cultivars were, on average, 1.3 % lower in seed oil content, 1.0% higher in seed protein content and equal in sum of oil end protein in the seed compared wittr the conventional cultivars. The hybrid cultivars were on average, 1.3 d later to 50% flowering and l. I d later to maturity than the average for the conventional cultivars, (i.e., equal or earlier to flowering and maturity than Regent). The hybrid cultivars were also 3.9% lower in harvest index and 1.3 ppm lower in chlorophylt content than the conventional cultivars.In spite of these differences, there were no significant cultivar-by-seeding-rate interactions, indicating that the hybrid and conventional cultivars responded similarly to varying seeding rate. Lodging, days to 50% flowering, days to maturity, harvest index, survival, oil content and protein content displayed significant linear responses to varying seeding rate. Stand at maturity, seed yield and total dry matter production displayed significant linear and quadratic responses to varying seeding rate. Varying seeding rate had no effect on seed fbrmation period, the sum of oil and protein content, or chlorophyll content. A seeding rate of 6 kg ha ' maximiied seed yield fbr both hybiid and conventional su--er rape cultivars.

Influence of Various Row Spacing on the Yield and Yield Components of Raya Anmol and Faisal Canola under Coastal Climatic Conditions of Lasbela

“…These results are in agreement with the findings of [5]- [7]. Humidity is low in mostly coastal area of the world and Temperature mostly range deviate very little from normal range in cropping season.…”

“…The data in (Table 1) shows C 2 produced maximum plant height as compared C 1 . Same results were reported by [5]- [9].…”

The effect of plant population densities on growth, yield and yield components of two spring rapeseed cultivars

“…Essentially, such a situation could be expected. This finding agrees with that of Van Deynze et al (1992), who reported that increased row spacing delayed flowering in rape. In this study, days to flowering varied more than three days across the row spacings (15, 30 and 45 cm).…”

“…In contrast, the protein content was not affected by changes in plant density. This result concurs with the findings of Kondra (1977) and Van Deynze et al (1992), who reported that protein content did not change with varying plant densities. However, Shrief et al (1990) reported that protein content was higher under higher population densities.…”

Response of herbicide-tolerant canola (Brassica napus L.) cultivars to four row spacings and three seeding rates in a no-till production system

“…At these two sites, the lowest plant densities achieved were over 20 plants/m 2 . Similar responses to plant density have been reported by McGregor (1987), Van Deynze et al (1992) and Leach et al (1999). No interaction occurred between cultivar and sowing rate in three trials at Lameroo, indicating that cultivars with considerable differences in early vigour responded similarly to varying sowing rate.…”