scholarly journals Seed yield and physiological responses to deal with drought stress and late sowing date for promising lines of rapeseed (Brassica napus L.)

2020 ◽  
Vol 34 (3) ◽  
pp. 321-331
Author(s):  
Maryam Teymoori ◽  
Mohammad Reza Ardakani ◽  
Amir Hossein Shirani Rad ◽  
Mojtaba Alavifazel ◽  
Parisa Nejatkhah Manavi
Keyword(s):  
Drought Stress ◽  
Brassica Napus ◽  
Seed Yield ◽  
Physiological Responses ◽  
Sowing Date ◽  
Late Sowing

scholarly journals Change in sowing date combined with water stress affects canola seed oil and fatty acid ‎composition

2020 ◽  
Vol 33 (02) ◽  
pp. 368-377
Author(s):  
Zahra Biyouk ◽  
Saeed Sayfzadeh ◽  
Hamidreza Zakerin ◽  
Amir Hossein Shirani Rad ◽  
Esmaeil Hadidi Masouleh
Keyword(s):  
Water Stress ◽  
Drought Stress ◽  
Seed Yield ◽  
Seed Oil ◽  
Sowing Date ◽  
Oil Yield ◽  
Glucosinolate Content ◽  
Cultivation Conditions ◽  
Late Season ◽  
High Seed Yield

To study the effect of sowing date and water stress on qualitative traits of canola, an experiment was conducted for two years in Iran. The sowing date and irrigation were in two levels as the main factors, and five canola cultivars and hybrids were included as the subfactors. In normal sowing date and normal irrigation conditions, The Tassilo hybrid with a high seed yield and seed oil yield (6139 and 2905 kg ha-1, respectively) can be effective in the cultivation of canola in temperate cold regions with dry and semi-arid climates. In the conditions of delayed cultivation and late season drought stress, the same hybrid with the highest seed yield and seed oil yield (2935 and 1273 kg ha-1, respectively) and the least amount of erucic acid (0.4%) and glucosinolate content (22.9 μmol g-1) is recommended for the delayed cultivation conditions together with late season drought stress.

scholarly journals Evaluating the effect of sowing date and drought stress on morphological and functional characteristics of three genotypes of winter oilseed rape (Brassica napus L.)

2019 ◽  
Vol 113 (1) ◽  
pp. 63
Author(s):  
Seyyed Hamid REZA RAMAZANI ◽  
Reza TAHERPOUR KALANTARI
Keyword(s):  
Drought Stress ◽  
Brassica Napus ◽  
Drought Tolerance ◽  
Oilseed Rape ◽  
Block Design ◽  
Sowing Date ◽  
Yield Traits ◽  
Winter Oilseed Rape ◽  
Brassica Napus L ◽  
Negative Effect

<p>To assess the effects of drought stress and sowing date on phenological, morphological, and yield traits of three different cultivars of winter oilseed rape (<em>Brassica napus</em> L.), this study was conducted in research farm of Sarayan agricultural college- University of Birjand in 2016-2017 growing season. Experiment was conducted in a split-factorial based on the randomized complete block design with drought stress in the main plots and three sowing date (September 22, October 6, and October 22) along with three cultivars of canola (‘Homolious’, ‘Hayola50’, and ‘DK7070CL’) in the subplots in three replications. The results of analysis of variance and means comparison analysis showed significant and negative effect of drought stress on seed yield and biological yield traits of investigated cultivars of canola. The interaction effect of drought stress × sowing date × cultivar was only significant on leaf twisting trait at 1 % probability level. ‘Homolious’ was assigned as the most drought tolerance cultivar, based on SI, SSI, RDI, TOL, MP, STI, GMP, YI, YSI, and HARM drought tolerance indexes, whereas ‘Hayola50’ was assigned as most drought sensitive cultivar of oilseed rape.</p>

Morphophysiological determinants of yield in rapeseed (Brassica campestris and Brassica napus). I. Growth and morphological characters

1974 ◽  
Vol 25 (5) ◽  
pp. 697 ◽  
Author(s):  
N Thurling
Keyword(s):  
Brassica Napus ◽  
Leaf Area ◽  
Seed Yield ◽  
Brassica Campestris ◽  
Dry Weight ◽  
Sowing Date ◽  
Dry Matter Distribution ◽  
Vegetative Phase ◽  
Total Dry Weight ◽  
Final Harvest

Variation in sowing date was found to have a marked effect on the seed yield and different morphological and growth characteristics of spring cultivars of the oilseed rape species Brassica campestris and Brassica napus. The two species differed appreciably, however, in their responses to successive delays in sowing date. In B. napus, there was a significant and continuous decline in seed yield with later sowings. This decline in seed yield was associated primarily with a reduction in the total dry weight of the plant at the final harvest which, in turn, was most closely correlated with the duration of the vegetative phase of growth. The total dry weight of the plant and the seed yield were greatest in the first sowing where flowering was substantially later than in either of the later sowings. Since earlier-flowering cultivars of B. napus would be better adapted to Western Australian conditions, where there is a rapid decline in soil moisture reserves during the spring, significant improvements in seed yield could depend largely on increasing the rate of pre-anthesis growth. In this experiment, however, no significant variation in the relative rate of growth prior to flowering was observed because of the marked negative association between net assimilation rate and leaf area ratio. Further studies of the variation in growth amongst a far wider range of genotypes will, nevertheless, be necessary to properly assess the feasibility of increasing relative growth rates by selection. The seed yield of B. campestris was substantially greater in the second sowing than in either the first or third sowings. Although seed yield was significantly correlated with both total dry weight of the plant at final harvest and the harvest index, the latter appeared to be the most important determinant of seed yield in this species. By contrast with B. napus, most of the dry weight of the plant at the final harvest was accumulated during the post-anthesis phase of growth. Accordingly, the character leaf area duration between anthesis and final harvest was found to be the most significant determinant of the total dry weight of the plant in B. campestris. The leaf weight ratio of the plant at anthesis also contributed significantly to total dry weight at the final harvest; this indicates that the pattern of dry matter distribution in the plant during the vegetative phase could prove a useful criterion for selecting potentially high-yielding strains of this species.

Triticale grain growth and morphometry as affected by drought stress, late sowing and simulated drought stress

2000 ◽  
Vol 27 (11) ◽  
pp. 1051 ◽  
Author(s):  
Conxita Royo ◽  
Mosbah Abaza ◽  
Ricardo Blanco ◽  
Luis F. García del Moral
Keyword(s):  
Drought Stress ◽  
Grain Growth ◽  
Chemical Treatment ◽  
Maximum Rate ◽  
Grain Filling ◽  
Sowing Date ◽  
Grain Weight ◽  
Simulated Drought ◽  
The Impact ◽  
Late Sowing

The effects on grain filling and morphometry of natural drought, late sowing and simulated drought by means of a chemical treatment with potassium iodide (KI) were compared over 3 years of field trials in triticale ( &yen; Triticosecale Wittmack) cv. Trujillo and three near-isogenic lines derived from it. Grain weight data fitted accurate to a logistic curve. The maximum rate of grain filling was the curve coefficient most sensitive to drought stress, and accounted for 7–50% of grain yield variation. Chemical treatment with KI caused greater variation in grain filling curve coefficients and grain morphometry than did a delay in the sowing date, which in turn caused greater variation than natural drought. The type and magnitude of the effects of the different kinds of stresses on grain growth and morphometry could be related to the time that elapsed from anthesis, at which time the effects were perceptible. KI reduced the maximum rate of grain filling and final grain weight by 38 and 32%, respectively, its effect being significant from 8 d after the treatment. The volume of grain was reduced 11% by KI. The impact of delayed sowing date and drought were significant 29 and 33 d after anthesis, respectively, corresponding to the end of the linear phase of the grain filling curves. Both treatments diminished grain filling duration (13% by delayed sowing, and 6% by drought, respectively), final grain weight (16 and 12%, respectively), grain volume (15% and 8%, respectively), and embryo area (8% in both cases), but neither altered the maximum grain filling rate.

scholarly journals Change in oil fatty acids composition of winter oilseed rape genotypes under drought stress and different temperature regimes

2019 ◽  
Vol 65 (No. 10) ◽  
pp. 503-507
Author(s):  
Nadia Gharechaei ◽  
Farzad Paknejad ◽  
Amir Hossein Shirani Rad ◽  
Ghasem Tohidloo ◽  
Hamid Jabbari
Keyword(s):  
Drought Stress ◽  
Oilseed Rape ◽  
Seed Yield ◽  
Sowing Date ◽  
Cultivation Conditions ◽  
Winter Oilseed Rape ◽  
High Oleic ◽  
Temperature Regimes ◽  
Sowing Dates ◽  
Promising Line

To assess the response of winter oilseed rape promising line genotypes to late-season drought stress in delayed cultivation conditions and select the superior genotypes, an experiment was conducted for two years (2015–16 and 2016–17) in Iran (Karaj). In this experiment, the sowing date was specified in two levels including timely cultivation (October 7) and delayed cultivation (October 27) and irrigation factor including normal irrigation and irrigation interruption from podding stage as factorial in main plots and four winter oilseed rape genotypes (L1030, L1204, L1110, and L1114) and a commercial cultivar (Okapi) were categorized in subplots. Applying drought stress after the podding stage declined the seed yield and seed oil yield, and the highest and lowest mean of these traits were observed in the L1204 and L1114 genotypes, respectively. The interaction effect of the sowing date × genotype on all the studied traits was significant. With the standard erucic acid, the genotype L1204 in both normal and delayed sowing dates had the highest seed yield of 5118 and 3015 kg/ha. Besides, with high oleic acid with a mean of 63.65% and the minimum amount of glucosinolate of seed with a mean of 21.55 μmol/g, this genotype is recommended in delayed cultivation conditions.  

scholarly journals Impact of Sowing Date Induced Temperature and Management Practices on Development Events and Yield of Mustard

2016 ◽  
Vol 18 (2) ◽  
pp. 45-52
Author(s):  
MSA Khan ◽  
MA Aziz
Keyword(s):  
Seed Yield ◽  
Management Practices ◽  
Agricultural Research ◽  
Sowing Date ◽  
Research Field ◽  
Yield Reduction ◽  
Sowing Dates ◽  
Mustard Crop ◽  
The Relationship ◽  
Late Sowing

The experiment was conducted at the research field of the Agronomy Division, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur, during rabi season of 2014-2015 to find out the relationship between different development events of mustard crop and sowing dates induced temperature as well as to minimize the yield reduction of the crop by adopting appropriate management practices. The mustard var. BARI Sarisha-15 was sown on 06, 25 November and 14 December 2014. Crop accumulated lower growing degree days (GDD) i.e., 72.15, 521.10 and 1070 to 1154 °C were observed for the events of emergence, 50 % flowering and maturity on 14 December sowing. Late sown plants took minimum time from flowering to maturity (36 days) due to increased temperature and high variability in both maximum and minimum temperature. The highest seed yield (1569 kg ha-1) was recorded from 06 November sowing with high management practices while the lowest seed yield (435 kg ha-1) from 14 December sowing with low management practices. At high management practices the crop yielded 1183 kg ha-1 at 14 December sowing. Yield reduction at late sowing condition was reduced to some extent with high management practices. The seed yield reductions at 14 December sowing as compared to high management practices at 06 November sowing were 72, 43 and 25% under low, medium and high management, respectively.Bangladesh Agron. J. 2015, 18(2): 45-52

Response of sowing dates and bio regulators on yield of clusterbean under current climate in alley cropping system in eastern U.P., India

2018 ◽  
Author(s):  
Hemraj Meena ◽  
Ram Swaroop Meena ◽  
Rattan Lal ◽  
Gulab Singh Yadav ◽  
Tarik Mitran ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Seed Yield ◽  
Alley Cropping ◽  
Foliar Application ◽  
Growth Parameters ◽  
Foliar Spray ◽  
Cropping System ◽  
Sowing Date ◽  
Sowing Dates ◽  
Late Sowing

The impacts on yields of cluster bean were assessed for normal (15 July) and late (30 July) sowing environments and foliar spray of thiourea (500, 1000 ppm) and salicylic acid (50, 100 ppm) at 45 and 60 days after sowing (DAS).Significantly higher yield parameters, yield, economics, protein content and nutrient uptake were recorded with foliar spray of thiourea at 500 ppm as compared to all other bio regulator sprays. Similarly, spray of salicylic acid at 100 ppm enhanced yield and other growth parameters which were statistically at par with those for thiourea 500 ppm foliar spray at 45 and 60 DAS. The data show that the foliar application of bio regulators at normal sowing date enhances seed yield of clusterbean by improving the physiological processes. The interaction effects were significant between the sowing date and bio-regulators on the seed yield. The highest seed yield of 993 and 845 kg/ha was obtained with foliar spray of thiourea at 500 ppm in normal and late sowing, respectively, while the lowest yield of 775 and 769 kg/ha was obtained for the water spray control in normal and late sowing, respectively.

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