scholarly journals The yield of mechanically harvested rapeseed (Brassica napus L.) can be increased by optimum plant density and row spacing

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Jie Kuai ◽  
Yingying Sun ◽  
Qingsong Zuo ◽  
Haidong Huang ◽  
Qingxi Liao ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Plant Density ◽  
Row Spacing ◽  
Brassica Napus L

EFFECT OF ROW SPACING AND SEEDING RATES ON SUMMER RAPE IN SOUTHERN MANITOBA

1990 ◽  
Vol 70 (1) ◽  
pp. 127-137 ◽  
Author(s):  
M. J. MORRISON ◽  
P. B. E. McVETTY ◽  
R. SCARTH
Keyword(s):  
Brassica Napus ◽  
Seed Quality ◽  
Plant Density ◽  
Chlorophyll Concentration ◽  
Plant Distribution ◽  
Row Spacing ◽  
Seeding Rate ◽  
Brassica Napus L ◽  
Plant Densities ◽  
Lower Plant

To determine the effects of varying plant densities on summer rape (Brassica napus L.), the cultivar Westar was seeded in 15- and 30-cm row spacings at seeding rates of 1.5, 3.0, 6.0, and 12.0 kg ha−1. Plants seeded in 15-cm rows yielded more per area, produced more pods per plant and lodged less than those in 30-cm rows. Higher yields were associated with a more even plant distribution and a lower degree of intra-row competition. There were no significant protein, oil and chlorophyll concentration differences between the row spacing treatments. The highest yields (kg ha−1) were achieved with the 1.5 and 3.0 kg ha−1 seeding rates. Summer rape compensated for lower plant densities with the production of more branch racemes. As seeding rate increased, competitive mortality increased, resulting in greater etiolation at bolting, and greater lodging at harvest. Seed oil and protein concentrations were not affected by seeding rate. However, seed chlorophyll concentration decreased with increased seeding rate.Key words: Brassica napus, plant density, seed quality, rape (summer)

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

2011 ◽  
Vol 49 (No. 9) ◽  
pp. 422-426 ◽  
Author(s):  
H. Ozer
Keyword(s):  
Brassica Napus ◽  
Yield Components ◽  
Plant Density ◽  
Growth Yield ◽  
Row Spacing ◽  
Oilseed Crop ◽  
Eastern Anatolia ◽  
Population Densities ◽  
Brassica Napus L ◽  
Yield And Yield Components

Rapeseed (Brassica napus L.) is an important alternate oilseed crop in eastern Anatolia, Turkey. No information on plant density for rapeseed is available in this region. Therefore a study was initiated to investigate the effects of spacings between rows and spacings within rows on the yield and agronomic characteristics of two genotypes of spring rapeseed (Tower and Lirawell) in Erzurum, eastern Anatolia, during 1994 and 1995. The effects of spacings between or within rows on the yield and yield components of Tower and Lirawell, two cultivars of Brassica napus L., were studied for 2 years inErzurum,Turkey. Rows were spaced at 15, 30 and45 cm. Spacings within rows were 5, 10 and15 cm. The results of this study suggested that seed yield was significantly affected by spacings between rows but not by spacings within rows, and that rape yields were higher at the narrow (15 cm) row spacing compared to the middle (30 cm) and wider (45 cm) spacings.

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

2013 ◽  
Vol 93 (6) ◽  
pp. 1229-1236 ◽  
Author(s):  
H. R. Kutcher ◽  
T. K. Turkington ◽  
G. W. Clayton ◽  
K. N. Harker
Keyword(s):  
Brassica Napus ◽  
Production System ◽  
Management Practices ◽  
Plant Density ◽  
Flea Beetle ◽  
Row Spacing ◽  
Seeding Rate ◽  
Brassica Napus L ◽  
No Till ◽  
Herbicide Tolerant

Kutcher, H. R., Turkington, T. K., Clayton, G. W. and Harker, K. N. 2013. Response of herbicide-tolerant canola ( Brassica napus L.) cultivars to four row spacings and three seeding rates in a no-till production system. Can. J. Plant Sci. 93: 1229–1236. Appropriate management practices are important to reduce input costs and to optimize yield and crop quality. The objective of this study was to determine the optimum row spacing (23, 31, 46 and 61 cm) and seeding rate (3.2, 6.4 and 9.6 kg ha−1, or 87, 173 and 260 seeds planted m−2) for two herbicide-tolerant canola (Brassica napus L.) cultivars (an open-pollinated and a hybrid) under a no-till production system. Plant density and yield varied with row spacing, with the effect being linear in both cases. Plant density decreased with wider row spacing, from 112 plants m−2 at the 23-cm row spacing to 83 plants m−2 at the 61-cm row spacing. Yield decreased with wider row spacing, from 2397 kg ha−1 at the 23-cm row spacing to 2138 kg ha−1 at the 61-cm row spacing. Results from this study indicate that herbicide-tolerant cultivars of canola grown in no-till production systems under conditions of adequate soil fertility, effective weed management, minimal disease pressure, and good flea beetle control, produced the highest plant densities and yields at row spacing of 24–31 cm, that seeding rates in the range of 3.2–9.6 kg ha−1 had no effects on yield, and that a hybrid cultivar performed better than open-pollinated cultivars in terms of plant density, earliness and duration of flowering, and seed size. The study helps to better define the response of plant density and seed yield in herbicide-tolerant canola cultivars to changes in row spacing and seeding rate. In particular, the results of this study suggest that plant density may not be a reliable predictor of canola yield, although row spacing is an important consideration.

Optimization of Plant Density and Row Spacing for Mechanical Harvest in Winter Rapeseed (Brassica napus L.)

2016 ◽  
Vol 42 (6) ◽  
pp. 898
Author(s):  
Jie KUAI ◽  
Ying-Ying SUN ◽  
Qing-Song ZUO ◽  
Qing-Xi LIAO ◽  
Suo-Hu LENG ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Plant Density ◽  
Row Spacing ◽  
Brassica Napus L ◽  
Winter Rapeseed

EFFECT OF ALTERING PLANT DENSITY ON GROWTH CHARACTERISTICS OF SUMMER RAPE

1990 ◽  
Vol 70 (1) ◽  
pp. 139-149 ◽  
Author(s):  
M. J. MORRISON ◽  
P. B. E. McVETTY ◽  
R. SCARTH
Keyword(s):  
Brassica Napus ◽  
Leaf Area ◽  
Growth Analysis ◽  
Plant Density ◽  
Dry Weight ◽  
Growth Characteristics ◽  
Row Spacing ◽  
Vegetative Development ◽  
Brassica Napus L ◽  
Area Index

The effect of 15- and 30-cm row spacings and 1.5, 3.0, 6.0 and 12.0 kg ha−1 seeding rates on growth characteristics, as measured by growth analysis, of summer rape (Brassica napus L.) was studied under southern Manitoba growing conditions. Growing degree days (GDD) was used in the growth analysis formulae as a measurement of time. Over all seeding rates, summer rape grown in rows spaced 15 cm apart produced more dry weight (W), a greater leaf area index (LAI) and a greater leaf area duration (LAD) than when grown in rows spaced 30 cm apart. The 15-cm row spacing treatments had a higher crop growth rate (CGR) and a greater net assimilation rate (NAR) than the 30-cm row spacing treatments. Summer rape grown at seeding rates of 6.0 and 12.0 kg ha−1 had a greater W, LAI and LAD during vegetative development than summer rape grown at seeding rates of 1.5 and 3.0 kg ha−1. This was primarily due to increased plant density. After flowering there were no differences for W, LAI and LAD attributable to differences in seeding rates. Summer rape grown at seeding rates of 6.0 and 12.0 kg ha−1 had a lower CGR and NAR during flowering than that grown at 1.5 and 3.0 kg ha−1 seeding rates indicating that plants produced from lower seeding rates were more photosynthetically efficient than plants produced from higher seeding rates.Key words: Brassica napus, growth analysis, row spacing, seeding rates, rape (summer)

Plot-to-plot, row-to-row and plant-to-plant outcrossing studies in oilseed rape

2001 ◽  
Vol 81 (4) ◽  
pp. 657-664 ◽  
Author(s):  
J. L. Cuthbert ◽  
P. B. E. McVetty
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Field Trials ◽  
Outcrossing Rate ◽  
Row Spacing ◽  
Brassica Napus L ◽  
Herbicide Resistance Gene ◽  
Outcrossing Rates ◽  
Resistant Individual ◽  
Plant Trials

Unidirectional outcrossing rates were assessed between neighboring plots, rows (spaced 40, 80 and 120 cm apart) and plants of oilseed rape (Brassica napus L.) grown in simulated plant breeding field trials, using the transgenic dominant bromoxynil herbicide resistance gene as a marker. Bromoxynil susceptible (pollen recipient) plots, rows and plants were planted in the field and surrounded by bromoxynil-resistant plots, rows and plants, respectively. The field trials were conducted at Winnipeg, Carman, and Portage la Prairie, Manitoba, in 1996 and 1997. Seed produced on the susceptible plots and rows was harvested and then planted in the field the following year with all emerged seedlings sprayed at 750 g a.i. ha–1 bromoxynil to identify resistant individuals. Approximately 420 000 seedlings were screened in 1997 and 1998 with 23 816 resistant individuals identified, each resistant individual being the result of an outcrossing event. The overall mean plot-to-plot outcrossing rate was 4.0% (± 0.23). The overall mean row-to-row outcrossing rate was 9.5% (± 0.62) for the 40-cm row spacing, 5.6% (± 0.37) for the 80-cm row spacing and 3.9% (± 0.25) for the 120-cm row spacing. For the plant-to-plant trials, seed produced on the susceptible plants was harvested and then a sample was planted in the greenhouse with all emerged seedlings sprayed at 560 g a.i. ha–1 bromoxynil to identify resistant individuals. The overall mean plant-to-plant outcrossing rate was 21.0% (± 1.73). Outcrossing rates of this magnitude have significant implications for all oilseed rape breeding programs. Methods to minimize outcrossing are discussed. Key words: Brassica napus L., outcrossing rates, transgenic dominant bromoxynil resistance marker

Commercial generations of Brassica napus cause greater yield loss in Triticum aestivum, than volunteer B. napus generations

2010 ◽  
Vol 90 (5) ◽  
pp. 777-783 ◽  
Author(s):  
N J Seerey ◽  
S J Shirtliffe
Keyword(s):  
Triticum Aestivum ◽  
Brassica Napus ◽  
Generational Differences ◽  
Yield Loss ◽  
Plant Density ◽  
Wheat Yield ◽  
Yield Losses ◽  
Large Area ◽  
Seedling Mortality ◽  
Brassica Napus L

Volunteer canola (Brassica napus L.) has become a common weed in producer fields, due to the large area cropped, and inherent harvest losses. Commonly grown B. napus varieties which segregate in subsequent generations to create volunteers with unknown competitive capabilities are developed by hybrid genetics. The objective of this study was to evaluate the effect of volunteer B. napus variety and generation on competition yield loss in hard red spring wheat (Triticum aestivum L.). Two hybrid and one open-pollinated B. napus varieties with three consecutive generations produced from each variety were grown at varying densities in a wheat stand over 5 site-years. Yield loss depended on the density of B. napus in relation to total plant density. Generational differences in B. napus seedlings resulted in differences in wheat yield losses. Brassica napus densities at maturity provided a more robust model of wheat yield loss, as there were differences in wheat yield losses due to the interaction of generation and variety of B. napus. Commercial seed generations were the most competitive plants, while volunteer generations were less competitive. The amount of yield loss caused by volunteer B. napus was highly variable. The availability of low-priced herbicides, and the competitive ability of volunteer B. napus may allow for economic thresholds concerning weed control to be surpassed at low densities of volunteer B. napus populations. Key words: Competition, hybrid, open-pollinated, volunteer weed, seedling mortality, mature density, seedling density, feral

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