scholarly journals THE INFLUENCE OF SEEDING DATE AND SEEDING RATE ON SEED YIELD AND GROWTH CHARACTERS OF FIVE GENOTYPES OF Brassica napus

1981 ◽  
Vol 61 (2) ◽  
pp. 184-189 ◽  
Author(s):  
D. F. DEGENHARDT ◽  
Z. P. KONDRA
Keyword(s):  
Brassica Napus ◽  
Seed Yield ◽  
Western Canada ◽  
Flowering Period ◽  
Seeding Rate ◽  
Brassica Napus L ◽  
Seed Formation ◽  
Agronomic Characteristics ◽  
Seeding Date ◽  
Growth Characters

The effects of seeding date and seeding rate on the agronomic characteristics of five genotypes of Brassica napus L. were studied for 2 yr at two locations in western Canada. Seeding date had a highly significant effect on seed yield, days to first flower, last flower, and maturity of first pod, and no significant effect on flowering period and seed formation period. Generally, the latest seeding date, at all seeding rates and for all genotypes, resulted in the lowest seed yield and the fewest days to first flower, last flower, and maturity of first pod. Seeding rate has a significant effect on days to last flower, maturity of first pod, and seed formation period, but no significant effect on seed sield, first flower and flowering period. Generally, the highest seeding rate at all seeding dates and for all genotypes resulted in the fewest days to last flower and maturity of first pod, and shortest seed formation period.

WESTAR SUMMER RAPE

1987 ◽  
Vol 67 (2) ◽  
pp. 491-493 ◽  
Author(s):  
A. J. KLASSEN ◽  
R. K. DOWNEY ◽  
J. J. CAPCARA
Keyword(s):  
Brassica Napus ◽  
Seed Yield ◽  
Oil Content ◽  
Western Canada ◽  
Agronomic Performance ◽  
Brassica Napus L ◽  
Early Maturity ◽  
Cultivar Description ◽  
Canola Quality ◽  
High Seed Yield

Westar summer rape (Brassica napus L.), licensed in 1982, is a canola-quality cultivar that combines high seed yield with high oil content and early maturity. Westar is adapted to the B. napus growing areas of western Canada and because of its superior agronomic performance has replaced the older cultivars Regent, Andor and Altex.Key words: Rape (summer), cultivar description

Alto summer rape

1991 ◽  
Vol 71 (2) ◽  
pp. 523-524
Author(s):  
Z. P. Kondra ◽  
D. F. Degenhardt ◽  
D. C. Campbell
Keyword(s):  
Brassica Napus ◽  
Protein Content ◽  
Key Words ◽  
Seed Yield ◽  
Oil Content ◽  
Western Canada ◽  
Brassica Napus L ◽  
Meal Protein ◽  
Cultivar Description ◽  
Canola Quality

Alto summer rape (Brassica napus L.), registered in 1988, is a canola-quality cultivar. Alto has a high meal protein content and is similar to the cultivar Westar in seed yield, oil content, and maturity. Alto is adapted to all of the B. napus growing areas in western Canada. Key words: Rape (summer), cultivar description

THE INFLUENCE OF SEEDING DATE AND SEEDING RATE ON SEED YIELD AND YIELD COMPONENTS OF FIVE GENOTYPES OF Brassica napus

1981 ◽  
Vol 61 (2) ◽  
pp. 175-183 ◽  
Author(s):  
D. F. DEGENHARDT ◽  
Z. P. KONDRA
Keyword(s):  
Brassica Napus ◽  
Plant Height ◽  
Seed Yield ◽  
Seed Weight ◽  
Harvest Index ◽  
Plant Density ◽  
Unit Area ◽  
Total Yield ◽  
Seeding Rate ◽  
Seeding Date

The effects of seeding date and seeding rate on the agronomic characteristics of five genotypes of Brassica napus L. were studied for 2 yr at two locations in western Canada. Delayed seeding resulted in a significant increase in vegetative and total yield but a significant decrease in seed yield, harvest index, plant density, racemes per plant and racemes per unit area. Seeding date had no significant effect on seed yield per plant, 1000-seed weight and plant height. Increased seeding rate resulted in a significant increase in plant density, and racemes per unit area, but a significant decrease in harvest index, racemes per plant, seed yield per plant and plant height. Seeding rate had no significant effect on seed, vegetative or total yield and 1000-seed weight. There were significant differences due to genotypes for all variables except for total yield and racemes per unit area.

AC Excel summer rape

1993 ◽  
Vol 73 (1) ◽  
pp. 183-184 ◽  
Author(s):  
G. Rakow
Keyword(s):  
Brassica Napus ◽  
Key Words ◽  
Seed Yield ◽  
Oil Content ◽  
Western Canada ◽  
Brassica Napus L ◽  
Cultivar Description ◽  
Canola Quality ◽  
High Seed Yield

AC Excel summer rape (Brassica napus L.), registered in 1990, is a canola-quality cultivar that combines high seed yield with high oil content and early to medium maturity. AC Excel is moderately susceptible to blackleg. It is well adapted to the B. napus growing areas of western Canada. Key words: Rape (summer), cultivar description

Seeding rate, fertilizer level and disease management effects on hybrid versus open pollinated canola (Brassica napus L.)

2007 ◽  
Vol 87 (2) ◽  
pp. 255-266 ◽  
Author(s):  
S. A. Brandt ◽  
S. S. Malhi ◽  
D. Ulrich ◽  
G. P. Lafond ◽  
H. R. Kutcher ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Seed Yield ◽  
Protein Concentration ◽  
Seed Quality ◽  
Yield Potential ◽  
Dry Matter Accumulation ◽  
Seeding Rate ◽  
Brassica Napus L ◽  
Fungicide Application ◽  
Oil Concentration

New canola cultivars have much higher yield potential than conventional canola cultivars and changes in production practices may be needed to achieve optimum yield from these cultivars. Studies were conducted to investigate the influence of seeding rates (2.8, 5.6 and 8.4 kg ha-1), fertilizer level (67% – low, 100% – medium, 133% – high of the commercial recommendation) and fungicide application on growth, dry matter accumulation, seed yield and seed quality using two high-yielding canola cultivars [cv. Quantum, open pollinated (OP), and cv. Invigor™, hybrid (HYB)]. The studies were conducted from 1999 to 2001 at three sites in the Parkland region of the Canadian prairies. The two cultivars did not differ in their responses to seeding and fertilizer rates, or fungicide application. Plant density was lower for the HYB than the OP because the HYB had larger seeds, with fewer seeds per kilogram. Emergence declined slightly at high fertilizer levels in some site-years due to fertilizer induced seedling damage, but increased with seeding rate. Time to onset of flowering and maturity showed no consistent influence of cultivar, and tended to be somewhat prolonged with an increase in fertilizer levels, but reduced by an increase in seeding rate. On average, the HYB produced 822 kg ha-1 more biomass and 200 kg ha-1 more seed yield than the OP. Sclerotinia stem rot incidence was very low, except at Melfort in 2000, and fungicide application generally failed to benefit the crop. Seed yield was generally increased when seeding rate was increased, with the largest increase occurring from 2.8 to 5.8 kg ha-1. Seed yield responses to the high rates of seeding or fertilizer only occurred where both inputs were at the highest level, indicating that the optimum level of one was dependent upon the level of the other input. Oil and protein concentration in the seed was higher for the HYB than the OP. High fertilizer levels generally increased the total yield of biomass and seed, and protein concentration in the seed, but usually reduced oil concentration in the seed. Increased seeding rate resulted in a small increase in oil concentration and a small reduction in protein concentration in the seed. Net returns were greatest and least variable for the HYB cultivar. Overall, the HYB performed better than the OP, and the full economic value of high-yielding canola cultivars was only realized when fertilizer and seeding rates were at or above the current recommended rates. Key words: Canola (Brassica napus L.), fertilizer rate, fungicide, hybrid canola, oil content, open pollinated canola, protein content, seeding rate, seed quality, yield

Effect of sowing date and seeding rate on yield and yield components of irrigated canola (Brassica napus L.) grown on a red-brown earth in south-eastern Australia

1992 ◽  
Vol 43 (7) ◽  
pp. 1629 ◽  
Author(s):  
AJ Taylor ◽  
CJ Smith
Keyword(s):  
Brassica Napus ◽  
Seed Yield ◽  
Sowing Date ◽  
Strongly Correlated ◽  
Seeding Rate ◽  
Brassica Napus L ◽  
South Eastern ◽  
Sowing Dates ◽  
Eastern Australia ◽  
South Eastern Australia

Response of canola (Brassica napus) to factorial combinations of five sowing dates and seeding rates was investigated from 1987 to 1989. The experiments were conducted on red-brown earths in the Goulburn-Murray Irrigation Region of south-eastern Australia. Crops were sown at monthly intervals beginning in April each year. In 1987, seeding rates were 4.6, 7.0 and 14 kg ha-1, but in 1988 and 1989 the lowest rate was eliminated. The cultivar Marnoo was used each year and Eureka was included in 1989. There was no difference between yields of seed and oil for crops sown in April and May, but yields of seed and oil declined when sowing date was delayed beyond May. Oil contents were greater than 45% for the April, May and June sowings in 1988 and 1989. In contrast, seeding rates had no effect on yields of seed and oil. Marnoo produced a maximum seed yield of 398 g m-2 from the May sowing in 1987, and a minimum seed yield of 172 g m-2 from the September sowing in 1988. In 1989, Eureka out-yielded Marnoo in all but the August sowing. Eureka produced a maximum seed yield of 483 g m-2 from the April sowing and its lowest seed yield of 315 g m-2 from the August sowing. The number of pods per m2 was the major factor responsible for the significant changes in yield in all experiments. Seed yield was also strongly correlated (P < 0.01) with biomass, and to a lesser degree, with individual seed weight in all comparisons with the exception of Marnoo in 1989.

Canola seed yield and phenological responses to plant density

2016 ◽  
Vol 96 (1) ◽  
pp. 151-159 ◽  
Author(s):  
Gan Yantai ◽  
K. Neil Harker ◽  
H. Randy Kutcher ◽  
Robert H. Gulden ◽  
Byron Irvine ◽  
...  
Keyword(s):  
Seed Yield ◽  
Plant Density ◽  
Block Design ◽  
Positive Association ◽  
High Yield ◽  
Western Canada ◽  
Flowering Period ◽  
Canola Seed ◽  
Randomized Complete Block Design ◽  
Plant Densities

Optimal plant density is required to improve plant phenological traits and maximize seed yield in field crops. In this study, we determined the effect of plant density on duration of flowering, post-flowering phase, and seed yield of canola in diverse environments. The field study was conducted at 16 site-years across the major canola growing area of western Canada from 2010 to 2012. The cultivar InVigor® 5440, a glufosinate-resistant hybrid, was grown at five plant densities (20, 40, 60, 80, and 100 plants m−2) in a randomized complete block design with four replicates. Canola seed yield had a linear relationship with plant density at 8 of the 16 site-years, a quadratic relationship at 4 site-years, and there was no correlation between the two variables in the remaining 4 site-years. At site-years with low to medium productivity, canola seed yield increased by 10.2 to 14.7 kg ha−1 for every additional plant per square metre. Averaged across the 16 diverse environments, canola plants spent an average of 22% of their life cycle flowering and another 27% of the time filling seed post-flowering. Canola seed yield had a negative association with duration of flowering and a positive association with the days post-flowering but was not associated with number of days to maturity. The post-flowering period was 12.7, 14.7, and 12.6 d (or 55, 68, and 58%) longer in high-yield experiments than in low-yield experiments in 2010, 2011, and 2012, respectively. We conclude that optimization of plant density for canola seed yield varies with environment and that a longer post-flowering period is critical for increasing canola yield in western Canada.

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

1992 ◽  
Vol 72 (3) ◽  
pp. 635-641 ◽  
Author(s):  
A. E. Van Deynze ◽  
P. B. E. McVetty ◽  
R. Scarth ◽  
S. R. Rimmer
Keyword(s):  
Protein Content ◽  
Chlorophyll Content ◽  
Seed Yield ◽  
Harvest Index ◽  
Dry Matter ◽  
Oil Content ◽  
Seed Quality ◽  
Seeding Rate ◽  
Seed Formation ◽  
Matter Production

To compare the effects of varying seeding rate on the agronomic performance, phenology and seed quality of hybrid and conventional summer rape cultivars, four hybrid and two conventional summer rape cultivars were seeded at 1.5, 3.0, 4.5, 6.0 and 9.0 kg ha−1 at two locations for 3 yr. The hybrid cultivars were, very importantly, 24% higher yielding and produced 50% more total dry matter than the conventional 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 and protein in the seed compared with the conventional cultivars. The hybrid cultivars were on average, 1.3 d later to 50% flowering and 1.1 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 chlorophyll 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 formation period, the sum of oil and protein content, or chlorophyll content. A seeding rate of 6 kg ha−1 maximized seed yield for both hybrid and conventional summer rape cultivars.Key words: Brassica napus, canola, seed quality, agronomy, phenology

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