The effect of paclobutrazol on plant height and seed yield of oil-seed rape (Brassica napus L.)

1985 ◽  
Vol 105 (3) ◽  
pp. 605-612 ◽  
Author(s):  
D. H. Scarisbrick ◽  
A. A. Addo-Quaye ◽  
R. W. Daniels ◽  
S. Mahamud
Keyword(s):  
Plant Height ◽  
Seed Yield ◽  
Field Trials ◽  
Stem Length ◽  
Soil Conditions ◽  
Brassica Napus L ◽  
Future Studies ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Adverse Influence

SUMMARYThe effect of paclobutrazol (applied at several concentrations and timings) on stem length and the seed yield of oil-seed rape was explored in three field trials during 1981–4. Spring applications were most effective in reducing plant height, but they had an adverse influence on the yield components. Autumn applications increased seed yield in one season, but were less effective in the final trial when soil conditions were much drier at establishment. Data indicated that autumn treatments may increase the productivity of the uppermost racemes. Future studies must investigate the persistency of paclobutrazol in the soil, and its possible influence on subsequent arable cropping.

A survey of the damage caused to crops of oil-seed rape (Brassica napus L.) by insect pests in south-central England and their effect on seed yield

1978 ◽  
Vol 90 (2) ◽  
pp. 417-424 ◽  
Author(s):  
J. B. Free ◽  
Ingrid H. Williams
Keyword(s):  
Seed Yield ◽  
Insect Pests ◽  
Winter Rape ◽  
Brassica Napus L ◽  
Plant Weight ◽  
Oil Seed ◽  
South Central ◽  
Oil Seed Rape ◽  
Winter Crops ◽  
Spring Rape

SummaryNo correlation was found between the seed yield per plant of oil-seed rape, the percentage of podless stalks and the percentage of pods infested with seed weevil larvae. The weight per seed and the percentage of podless stalks of winter and spring rape plants were similar.In winter crops the mean number of seeds per plant, weight of seeds per plant, and number of pods per plant were greater near the crop centre than near the crop edge. Plants with relatively few seeds tend to compensate by having heavier ones.Pods infested with seed weevil had fewer and lighter seeds than pods not infested, but the overall decrease in weight of seed per pod was small. The proportion of pods infested with seed weevil in winter rape was twice that in spring rape plants, but was not great. In lightly infested fields the weevils were concentrated at the edges, but the opposite occurred as infestation increased.Infestation of pods of winter rape by seed weevil increased with the number of years rape had been grown on the farm. There was no correlation between insecticide application and yield, but the number of insecticide applications to spring rape crops was positively correlated with the number of years for which the farmer had grown rape.

Reflexion and absorption of solar radiation by flowering canopies of oil-seed rape (Brassica napus L.)

1987 ◽  
Vol 109 (3) ◽  
pp. 495-502 ◽  
Author(s):  
D. J. Yates ◽  
M. D. Steven
Keyword(s):  
Seed Yield ◽  
Strongly Correlated ◽  
Brassica Napus L ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Negative Effect ◽  
Flower Density ◽  
Effect On Yield ◽  
Reduced Light ◽  
Leaf Canopy

SummaryFlowers were present over a period of approximately 6 weeks in 12 varieties of oil-seed rape. A linear relationship was found between flower cover (maximum 74%) and photon reflectivity (400–700 nm) which increased from around 0·047 during vegetative growth to 0·195 for a canopy in full flower. Reflexion and absorption of photons by flowers reduced light available to the leaf canopy and immature pods. Spectral measurements indicate that flowering canopies reflect substantially more radiation and absorb less than vegetative canopies between 500 and 700 nm but reflect less and absorb slightly more between 400 and 500 nm.Seed yield was not strongly correlated with estimates of the radiation absorbed by the leaf canopy under the flower layer. It appears that whilst increased flower density in a canopy might be expected to contribute to increased seed yield, increased reflectivity by petals may have a negative effect on yield. Breeding for reduced petal size or for apetalous lines may result in improved yields by producing more efficient light distribution within the canopy.

The effect of Terpal on the yield and yield components of oil-seed rape (Brassica napus L.)

1983 ◽  
Vol 100 (3) ◽  
pp. 745-748 ◽  
Author(s):  
J. F. Chapman ◽  
D. H. Scabisbrick ◽  
R. W. Daniels
Keyword(s):  
Plant Height ◽  
Yield Components ◽  
Quaternary Ammonium Compound ◽  
Ammonium Compound ◽  
Brassica Napus L ◽  
Mepiquat Chloride ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Wide Range ◽  
Yield And Yield Components

The objective of this study was to examine the effect of the chemical growth regulator Terpal (a mixture of mepiquat chloride and ethephon or 2 chloroethyl phosphonic acid) on the pattern of branching, plant height and yield components of winter oil-seed rape (cv. Jet Neuf). Mepiquat chloride (a quaternary ammonium compound with similar antigibberellin properties to cycocel) was developed as a morphoregulator for cotton where it has been shown to reduce plant height, shorten internodes and increase boll retention (Willard et al. 1977). The activity of ethephon has been attributed to its release of ethylene which influences a wide range of developmental processes, for example fruit abscission and ripening (Chatterjee, 1977; Gvozdenovic, Dulic & Slavic, 1978), growth retardation (Van Andel & Verkerke, 1978) and also the extent of lodging in cereals (Hill, Joice & Squires, 1982).

The effect of drilling date on the growth and yield of oil-seed rape (Brassica napus L.)

1987 ◽  
Vol 108 (1) ◽  
pp. 195-200 ◽  
Author(s):  
P. J. W. Lutman ◽  
Fiona L. Dixon
Keyword(s):  
Brassica Napus ◽  
Seed Yield ◽  
Dry Weight ◽  
Early Summer ◽  
Growth And Yield ◽  
Practical Significance ◽  
Brassica Napus L ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Autumn And Winter

SummaryThe effects of drilling date (18 August–22 September) on the growth and yield of oil-seed rape (Brassica napus) was studied in a series of five experiments over three seasons. Autumn and winter growth of the crop, as measured by dry weight of tops and leaf area, was severely reduced by delayed drilling, especially if it was later than 10 September. However, during the spring and early summer the differences in crop weight due to drilling date declined and in four of the five experiments there were no detectable differences in seed yield between early- and late-sown crops. The yield decline in the fifth trial was small. Measurements of components of yield showed that later-sown crops had fewer pods per plant and slightly smaller seeds but apparently more seeds per pod. The practical significance and reasons for the recovery of late drilled crops from early poorer growth are discussed.

A note on sampling technique for winter oil-seed rape (Brassica napus L.)

1982 ◽  
Vol 99 (1) ◽  
pp. 225-227 ◽  
Author(s):  
D. H. Scarisbrick ◽  
A. Clewer ◽  
R. W. Daniels
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Nitrogen Fertilizer ◽  
Yield Components ◽  
Sampling Technique ◽  
Brassica Napus L ◽  
Plant Weight ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Sampling Problems

The response of three spring cultivars of oilseed rape to five levels of nitrogen fertilizer (0 to 200 kg/ha) was studied during 1978–9 (Scarisbrick, Daniels & Alcock, 1981). Sampling problems, practical difficulties of measuring yield components, and the high co-efficients of variation for these data were discussed. During the course of further investigations on the winter cultivar Jet Neuf (established on approximately 75000 ha in the U. K. during 1980–1) within-plot variability for plant weight was assessed in order to indicate the size of sample necessary to compare treatment means.

scholarly journals Effects of sulphur on the yield, yield component characters and oil content of oilseed rape

2021 ◽  
Vol 66 (1) ◽  
pp. 17-25
Author(s):  
Valiollah Rameeh ◽  
Maryam Niakan ◽  
Mohammad Mohammadi
Keyword(s):  
Brassica Napus ◽  
Plant Height ◽  
Oilseed Rape ◽  
Seed Yield ◽  
Oil Content ◽  
Statistical Difference ◽  
Mean Value ◽  
Yield Component ◽  
Brassica Napus L ◽  
Significant Statistical Difference

The effects of four sulphur levels: S0, S1, S2 and S3, including 0, 12, 24 and 36 kg S ha-1, respectively, along with 115 kg N ha-1 were studied on yield-related traits of oilseed rape (Brassica napus L.). The significant variance of treatments was determined for plant height, yield component characters, seed yield and oil content. The sulphur application significantly increased most of the traits compared to the S0 level. The S3 (36 kg S ha-1) treatment led to the highest mean value of plant height (132 cm) which was classified with S2 (24 kg S ha-1) in the same statistical group. Sulphur had an increasing effect on pods per plant, and it ranged from 92 to 196 for S0 and S3 applications, respectively. S0 and S1 with 92 and 121 pods per plant were grouped in the same statistical group. In addition, S2, and S3 with 165 and 196 pods per plant showed no significant statistical difference. The sulphur application significantly increased seed yield compared to control (S0 level), and it ranged from 2744 to 3215 kg ha-1 in S0 and S3, respectively. The average oil contents of 45.69, 46.96, 47.46 and 49.53 % were detected for 0, 12, 24 and 36 kg S ha-1, respectively.

Quantitative analysis of the growth, development and distribution of flowers and pods in oil seed rape (Brassica napus L.)

1975 ◽  
Vol 85 (1) ◽  
pp. 103-110 ◽  
Author(s):  
T. O. Tayo ◽  
D. G. Morgan
Keyword(s):  
Quantitative Analysis ◽  
Brassica Napus ◽  
Growth And Development ◽  
Brassica Napus L ◽  
Flower Opening ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Whole Plant ◽  
Growth Development

SUMMARYThe growth and development of single plants of oil seed rape, variety Zollerngold, are described quantitatively and particular attention paid to the sequence and pattern of flower and pod production on the different inflorescences. The period of flower opening over the whole plant spanned an average of 26 days and more than 75% of the pods which were retained to maturity were formed from flowers which opened within 14 days of anthesis. Most of these flowers were found on the terminal raceme and on the basal and middle regions of the axillary inflorescences arising from the uppermost three nodes.

Stability of Yield Components from Winter Oil-Seed Rape (Brassica napus L.)

1987 ◽  
Vol 158 (2) ◽  
pp. 107-113 ◽  
Author(s):  
H.-P. Sierts ◽  
G. Geisler ◽  
J. Leon ◽  
W. Diepenbrock
Keyword(s):  
Brassica Napus ◽  
Yield Components ◽  
Brassica Napus L ◽  
Oil Seed ◽  
Oil Seed Rape
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