Sowing time effects on the development, yield and oil characteristics of irrigated sunflower (Helianthus annuus) in semi-arid tropical Australia

The effect of sowing time on development, yield and oil characteristics of irrigated sunflowers was studied in an experiment at the lrrigation Research Station, Ord lrrigation Area (15� 30'S, 128� 43'E), Western Australia in 1978. Sunflower cultivars Hysun 10, Hysun 30, Sunfola 68-2 and Polestar were sown at monthly intervals between mid-February and mid-August. Delay in sowing from February to June increased the period from sowing to physiological maturity by between 10 d (Hysun 10) and 24 d (Hysun 30), due mainly to an increase in the period from emergence to bud visible. Results showed that May sowing of the late maturing hybrid Hysun 30 was the best combination, with a seed yield of 2.3 t/ha. Oil content and quality (% linoleic acid) were highest with April sowing, 47.0 and 57.0%, respectively. Sowings from April to July gave acceptable yields (1.8-2.0 t/ha) and oil contents (45-47%). However, oil quality, although responding to sowing date, was always lower than the accepted level of 60% linoleic acid. Seed yields, which were considerably lower than those recorded for irrigated sunflower in southern Australia, are discussed in terms of the environmental limitations of the region

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Selection of Lentil (Lens culunaris L.) Lines Grown at Different Sowing Dates for Their Precocity and Their Agronomic Performance under Semi-arid Climate of Tunisia

Legume Research - An International Journal ◽

10.18805/lr-623 ◽

2021 ◽

Author(s):

A. Ouji ◽

M. Mechri ◽

S. Wassli ◽

K. Shiv ◽

M. Kharrat

Keyword(s):

Arid Zone ◽

Sowing Date ◽

High Yield ◽

Research Station ◽

Short Cycle ◽

Cropping Season ◽

Sowing Dates ◽

Significant Yield ◽

Semi Arid ◽

Selection Of

Background: In Tunisia, water deficit and heat stress during the end of cycle are more frequent and causes significant yield losses. Selection of short cycle lines could be a good solution to escape the effect of heat and drought during the end of cycle. Furthermore, there is little published information on the effect of the sowing date on yield and its components in lentils. The aim of this study was to investigate the effect of the sowing date on yield and its components of some lentil lines. The best productive and early lines will be selected and therefore proposed for registration in the official catalog of plant varieties. The availability of these varieties to farmers could increase lentil production. Methods: Sixteen genotypes of lentil out of which 14 were advanced lines and 2 were checks varieties were used in this study. The field experiment was conducted during the 2017-2018 cropping season at Kef research station located in a semi-arid zone in north western Tunisia. Genotypes were sown on December 15th, 2017 and February, 7th, 2018. Seventeen agro-morphological parameters were recorded. Result: Based on agro-morphological analysis, lentil lines exhibited considerable genetic variability. Among the tested lines, L3 line seem to be the earliest lines. It showed high yield as well in timely and late sown dates. This line deserves more attention to develop short-cycle and high yielding variety.

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Correction - Time of planting effects on development, yield and oil quality of irrigated sunflower

Australian Journal of Experimental Agriculture ◽

10.1071/ea9760417c ◽

1976 ◽

Vol 16 (80) ◽

pp. 417

Author(s):

GD Keefer ◽

JE McAllister ◽

ES Uridge ◽

BW Simpson

Keyword(s):

Oleic Acid ◽

Linoleic Acid ◽

Oil Quality ◽

Flowering Period ◽

Reliable Index ◽

Puccinia Helianthi ◽

Seed Yields ◽

Oleic And Linoleic Acids ◽

Late Sowing

The effects of time of planting on irrigated sunflower were tested at Emerald during the 1969-70 and 1970-71 summer seasons. Plantings ranged from September to March. A growing degree day summation from a base of 0�C (GDDo) was the most reliable index of commencement of flowering (cv. 5.7 per cent). Sunfola commenced flowering at 1331 � 76 GDDo. In both seasons significantly higher seed and oil yields were obtained from a December planting (Seed yields 2628 kg ha-1 1969-70, 1808 kg ha-1 1970-71, oil yields 1025 kg ha-1 1969-70, 61 5 kg ha-1 1970-71). Lower yields at all times of planting in the second season were attributed to rust infection (Puccinia helianthi Schw) . A good correlation was obtained between oil quality (proportions of oleic and linoleic acids) and temperatures during the post flowering period. Oleic acid levels ranged from 12 to 48 per cent. Linoleic acid levels ranged from 39 to 73 per cent. Oil quality (per cent linoleic acid) improved with late sowing in association with lowered temperatures

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Optimal sowing time and seeding rate for winter-sown, rain-fed chickpea in a cool, semi-arid Mediterranean area

Australian Journal of Agricultural Research ◽

10.1071/ar05074 ◽

2005 ◽

Vol 56 (11) ◽

pp. 1227 ◽

Cited By ~ 4

Author(s):

Sui-Kwong Yau

Keyword(s):

Field Experiments ◽

Agricultural Research ◽

Ascochyta Blight ◽

Mediterranean Area ◽

Sowing Date ◽

High Elevation ◽

Early Spring ◽

Seeding Rate ◽

Sowing Time ◽

Semi Arid

Chickpea (Cicer arietinum) is one of the 3 most important legume crops in West Asia and North Africa. Winter sowing of chickpea has been advocated recently in the region, but detailed research on date and rate of sowing has not been conducted. The objectives of this study were to find the optimal sowing month and to test the hypothesis that a lower than normal seeding rate is needed for winter-sown chickpea. Two series of field experiments were conducted under rain-fed conditions at the Agricultural Research and Educational Center in the Bekaa Valley of Lebanon. In the sowing-date experiment, which was conducted over 3 years, seed was sown in November, December or January and February. The seeding-rate by sowing-date experiment, which was conducted over 2 years, consisted of 3 seeding rates: 25, 40 and 55 seeds/m2, and 2 sowing dates: one each in November and March. Sowing in December or January gave similar seed yield as November sowing, and both gave higher yield than sowing in February. Sowing in December or January should be preferable than sowing in November because it is expected to give adequate time for weed control and less chance of ascochyta blight infestation. Seeding rates had no significant effects on yield, and seeding-rate by sowing-date interaction was non-significant, indicating that there is no yield advantage of a reduced seeding rate with winter sowing. However, sowing at 25 seeds/m2 yielded bigger seeds, which usually fetch higher prices. In conclusion, chickpea farmers in the semi-arid areas of the high-elevation Bekaa Valley of Lebanon or in other areas with similar environments should shift their sowing date from early spring to December or January and sow at a lower (25 seeds/m2) than normal seeding rate.

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Effet de la période et densité de semis sur la croissance et le rendement du cotonnier au Bénin

Journal of Applied Biosciences ◽

10.35759/jabs.152.7 ◽

2020 ◽

Vol 152 ◽

pp. 15676-15697

Author(s):

Isidore Amonmidé ◽

Germain D. Fayalo ◽

Gustave D. Dagbenonbakin

Keyword(s):

Cotton Seed ◽

Plant Density ◽

Central Zone ◽

Sowing Date ◽

Sowing Time ◽

Ecological Zones ◽

Split Plot ◽

Northern Zone ◽

Seed Yields ◽

Agro Ecological Zones

Objectif : L’objectif de l’étude était d’identifier les meilleures périodes et densités de semis dans les différentes zones agro-écologiques cotonnières du Bénin dans un contexte de changement climatique. Méthodologie et résultats : Les expérimentations ont été conduites pendant deux ans (2017 et 2018) en station au Bénin dans un dispositif expérimental en split-plot à deux facteurs, la période (facteur principal) et la densité de semis (facteur secondaire) respectivement à quatre et cinq variantes avec quatre répétitions. Les données collectées ont été soumises à une analyse de variance sous le logiciel R.3.6.1 au seuil de 5% de probabilité d’erreur. Les résultats ont montré au cours des deux années d’expérimentation que les semis tardifs ont enregistré les plus faibles rendements en coton graine dans la zone centre-nord tandis que toutes les dates de semis ont donné des rendements équivalents dans la zone nord. La densité de semis à 62500 plants/ha a donné le meilleur rendement. Conclusion et applications des résultats : Le semis du cotonnier peut s’étendre sur quatre décades (20 mai au 30 juin) dans la zone nord contrairement au centre-nord où la période optimale de semis s’étend seulement sur les deux dernières décades de juin (10-30 juin). La densité à 62500 plants/ha (0,20m x 0,80m à 1 plant/poquet) pourrait être recommandée pour l’amélioration des rendements en culture cotonnière au Bénin. L’adoption de cette densité de semis offre aux producteurs l’opportunité de mécaniser les opérations de semis et de fertilisation, compte tenu de la faible distance inter-poquets par rapport aux densités en vulgarisation. Mots clés : Période de semis, densité de semis, rendement coton graine, zones cotonnières, Bénin. Effect of sowing time and plant density on growth, development and yield in Benin ABSTRACT Objective: This study aimed at identifying the best sowing date and plant densities in the different cotton agro-ecological zones of Benin in a context of climate change. Methodology and results: On-station trials were conducted during two years (2017 and 2018) in Benin in a split-plot experimental design with two factors, the sowing date (main factor) and the plant density (secondary factor) with four and five levels, respectively with four replications. Collected data were submitted to an analysis of variance under R.3.6.1 software at 5% probability threshold error. Results showed other the two Amonmidé et al., J. Appl. Biosci. 2020 Effet de la période et densité de semis sur la croissance et le rendement du cotonnier au Bénin 15677 years of trial that late sowings recorded the lowest cotton seed yields in the northern central zone while all sowing date gave similar yields in the northern zone. Planting density of 62500 plants/ha gave the best yields. Conclusion and applications of the results: Cotton sowing could be extended over four decades (20 May to 30 June) in the northern zone contrarily to the northern central zone where the optimal sowing time covers only the last two decades of June (10-30 June). Plant density of 62500 plants/ha (0.20 m x 0.80 m at 1 plant/pot) could be recommended to improve cotton seed yields in Benin. The adoption of this new plant density offers producers the opportunity to mechanize sowing and fertilizer application, given low inter-plant space compared to the recommendation in Benin. Key words: Sowing date, plant density, cotton seed yield, cotton agro-ecological zones, Benin.

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Environmental influence on sunflower achene growth, oil content and oil quality

Australian Journal of Experimental Agriculture ◽

10.1071/ea9790082 ◽

1979 ◽

Vol 19 (96) ◽

pp. 82 ◽

Cited By ~ 14

Author(s):

PJ Goyne ◽

BW Simpson ◽

DR Woodruff ◽

JD Churchett

Keyword(s):

Linoleic Acid ◽

Acid Content ◽

Oil Content ◽

Environmental Influence ◽

Oil Quality ◽

Dry Weight ◽

Linoleic Acid Content ◽

Research Station ◽

Climatic Data ◽

Mean Temperature

Achenes of the open-pollinated sunflower cultivar Sunfola 68-2 and the hybrid Hysun-30 were sampled at seven day intervals following first anthesis in December and April plantings at Biloela Research station in Central Queensland during 1975. For both sowing times, Sunfola 68-2 had reached maximum achene dry weight, oil and linoleic acid content by 800 growing degree days (GDD) (base -1.3�C) after first anthesis and Hysun-30 by 900 GDD (base -5.g�C). The corresponding achene moisture contents were 32.1% and 34.2%, respectively. Using this information, relations were established between oil content, linoleic acid and climatic data obtained from a number of plantings made at Emerald and Biloela in Central Queensland. Although there were significant relations between oil content and temperature, other plant and environmental factors were found to be more important in the determination of the final oil content. Linoleic acid content of Sunfola 68-2 at harvest was best related to mean temperature between 300 and 800 GDD following first anthesis in the form: Y = 63.41 + 2.46X - 0.10X2 (R2 = 79.4, P < 0.01) where X is the mean temperature 300 to 800 GDD after 50% flowering. This equation explained 80% of the variation in linoleic acid content of achenes obtained from 16 independent plantings made at Biloela from 1972 to 1975, and a range of linoleic acid from 55 to 78%. Linoleic acid for Hysun-30 was significantly correlated with both average mean and mean minimum temperatures from 300 to 900 GDD after 50% flowering. The formulation of these relations and use of the findings in the early harvesting of sunflowers and in studying planting times is discussed.

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Time of planting effects on development, yield and oil quality of irrigated sunflower

Australian Journal of Experimental Agriculture ◽

10.1071/ea9760417 ◽

1976 ◽

Vol 16 (80) ◽

pp. 417 ◽

Cited By ~ 1

Author(s):

GD Keefer ◽

JE McAllister ◽

ES Uridge ◽

BW Simpson

Keyword(s):

Oleic Acid ◽

Linoleic Acid ◽

Oil Quality ◽

Flowering Period ◽

Reliable Index ◽

Puccinia Helianthi ◽

Seed Yields ◽

Oleic And Linoleic Acids ◽

Late Sowing

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Influence of Sowing Time on Yield and Yield Components of Spring Rapeseed in Lithuania

Agronomy ◽

10.3390/agronomy11112170 ◽

2021 ◽

Vol 11 (11) ◽

pp. 2170

Author(s):

Lina Marija Butkevičienė ◽

Zita Kriaučiūnienė ◽

Rita Pupalienė ◽

Rimantas Velička ◽

Silvija Kosteckienė ◽

...

Keyword(s):

Yield Components ◽

Seed Weight ◽

Sowing Date ◽

Meteorological Conditions ◽

Sowing Time ◽

Similar Time ◽

Experimental Station ◽

Sowing Dates ◽

Seed Yields ◽

Number Of Seeds

Sowing time, as an element, is important to improving the adaptation of cultivars to environmental conditions and to achieving high seed yields. The field experiment was conducted from 2018–2019 at the Experimental Station of Vytautas Magnus University Agriculture Academy. The experimental design included treatments with different sowing dates: eight sowing dates in 2018 and 10 sowing dates in 2019. The first sowing of spring rapeseed was carried out when the soil reached its physical maturity, i.e., it did not stick to agricultural implements and it crumbled well. The other sowing dates were every seven subsequent days. From 2018–2019, the rapeseed emerged as best in early May (3 and 4 May), and later sowing reduced the emergence of rapeseed. In 2018, most pods were formed on one plant when the rapeseed was sown (on 1 June), compared to other sowings, on average 2.8 times more. In 2019, most pods were formed by the latest-sown rapeseed (7 June), from 1.4 to 2.7 times more compared to previously sown crops. In 2018, the sowing time of spring rapeseed did not have a significant effect on the number of seeds in one pod. In 2019, it was found that the rapeseed formed most of the seeds in the pod at a similar time as in 2018: the sowings of 19 April and 7 June. The average number of seeds in the pod was significantly reduced by early sowing (5 April). In 2019, the highest 1000-seed weight was found at the earliest-sown crop (5 April), which was on average 18.0% higher compared to the later sowings. The 1000-seed weight of the last-sown rapeseed (7 June) was the lowest. In 2018, the yields of early-sown (20 April) spring rapeseed were the highest. Later sowing significantly reduced the yields by 20.7 to 48.2%. In 2019, the highest seed yield was obtained after sowing spring rapeseed in late April (26 April); it was significant, on average, 1.9 times higher than the yields of spring rapeseed sown from 3 May to 7 June. Meteorological conditions had a stronger effect on the field emergence and yield components of spring rapeseed than the sowing date.

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Evaluation of some sunflower genotypes for agronomic traits and oil quality

Helia ◽

10.1515/helia-2020-0027 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Khaled Mohamed Aboelkassem ◽

Asmaa Abd-EL-Halime Ahmed ◽

Mohamed Ali Abdelsatar

Keyword(s):

Fatty Acids ◽

Seed Yield ◽

Seed Weight ◽

Unsaturated Fatty Acids ◽

Agronomic Traits ◽

Oil Quality ◽

Research Station ◽

Head Diameter ◽

Coefficients Of Variation ◽

100 Seed Weight

Abstract The present investigation was carried out to evaluate agronomic performance and oil quality of seven sunflower genotypes at Shandaweel Research Station, Agricultural Research Center, Sohag, Egypt during 2018 and 2019 summer seasons. These genetic materials were sown in a randomized complete block design having three replications. Significant genetic variations among evaluated sunflower genotypes for agronomic traits and oil quality were observed. The superior sunflower genotypes were Line 120 for seed yield per hectare (3102.38 kg), Sakha 53 for seed oil content (44.63 %) and Line 125 for oil quality where it contained the highest proportion of unsaturated fatty acids (89.20 %). The phenotypic coefficients of variation were slightly higher than genotypic coefficients of variation for all studied traits. High heritability (exceeded 60%) and genetic advance as percent of mean (ranged from medium to high, exceeded 10%) was observed for most studied traits. Seed yield per plant positively correlated with plant height, stem diameter, head diameter, and 100-seed weight and most chemical traits at phenotypic and genotypic levels. Maximum phenotypic direct effects on seed yield per plant were observed for 100-seed weight, head diameter and total unsaturated fatty acids. While, the highest genotypic direct effect on seed yield per plant was observed for head diameter. Hence, most studied traits could be employed as selection criteria for improving evaluated sunflower genotypes.

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Genetic parameters of Barki sheep raised under semi-arid conditions

Animal Science ◽

10.1017/s0003356100027008 ◽

1969 ◽

Vol 11 (3) ◽

pp. 361-367 ◽

Cited By ~ 9

Author(s):

M. H. Fahmy ◽

E. Salah E. Galal ◽

Y. S. Ghanem ◽

S. S. Khishin

Keyword(s):

Genetic Parameters ◽

Genetic Correlations ◽

Research Station ◽

Phenotypic Correlations ◽

Arid Conditions ◽

Body Weights ◽

Genetic And Phenotypic Correlations ◽

Fleece Weight ◽

Semi Arid ◽

Desert Research

SUMMARYRecords on 695 lambs were collected over a period of 5 years from 1961/62 to 1965/66, at Ras El-Hekma Desert Research Station, 230 km west of Alexandria. The characters studied were birth, weaning and yearling body weights, pre- and post-weaning daily gains and greasy fleece weight.Birth, 120-day and 365-day body weights were 3·4, 18·2 and 33·4 kg respectively. Greasy fleece weight at 16 months of age was 3·29 kg. Heritability estimates of birth, weaning, yearling weights, pre- and post-weaning daily gains and greasy fleece weight were 0·22, 0·45, 0·41,0·45 and 0·29 respectively. Genetic and phenotypic correlations between birth, weaning and yearling weights were all positive and significant. Genetic correlations between fleece weight and body characteristics were negative and low.

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