Rendement potentiel en semence l'année du semis de cultivars de trèfle rouge

1994 ◽  
Vol 74 (4) ◽  
pp. 807-809 ◽  
Author(s):  
Lucius Belzile
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Seed Weight ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Dominant Effect ◽  
Age Diversity ◽  
Trifolium Pratense L ◽  
Clover Seed ◽  
Moisture Conditions

The potential of seed production of red clover (Trifolium pratense L.) in the seeding year was studied for 4 yr using five cultivars on two soil types. Data were collected on seed yield, weight and germination. Yields of up to 580 kg ha−1 were obtained. Interactions of the effects of soil, year and cultivar on seed yield were observed. The absence of a dominant effect on seed yield is probably related to the varying moisture conditions among years and the age diversity of the plant population from which seeds were harvested. Seed germination varied among years and cultivars and seed weight among cultivars. Key words: Red clover, seed production, cultivar, seeding year

scholarly journals Seed Production of Red Clover (Trifolium pratense L.) under Danish Field Conditions

Agriculture ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1289
Author(s):  
Shuxuan Jing ◽  
Birte Boelt
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Seed Weight ◽  
Trifolium Pratense ◽  
Seed Set ◽  
Red Clover ◽  
Flower Head ◽  
Trifolium Pratense L ◽  
Thousand Seed Weight ◽  
High Seed Yield

High and stable seed yield is critical for red clover (Trifolium pratense L.) seed production and the commercial exploitation of the crop. A three-year experiment was conducted from 2013 to 2015 under Danish field conditions to explore the influence of precipitation during peak flowering on the seed yield of three red clover cultivars. We investigated the flowering duration and intensity based on a visual scale assessment, seed yield, and thousand seed weight in all three experimental years. In 2014 and 2015 we measured the seed yield components of floret number per flower head, seed number per flower head, and seed set. During the experimental period, high seed yields of more than 1000 kg ha−1 were obtained for the diploid cultivars ‘Rajah’ and ‘Suez’. Although a relatively high seed yield of 500 kg ha−1 was obtained in the tetraploid cultivar ‘Amos’, this was only around half of the seed yield and seed set of the diploid cultivars. Precipitation during peak flowering positively influenced the seed yield and thousand seed weight for the three cultivars. We conclude that observations of flowering phenology are required to determine the impact of environmental conditions on seed yield in red clover cultivars. Further, adequate water supply during peak flowering is important to obtain the high seed yield of red clover.

scholarly journals Comparative study of seed yield and seed quality of advanced lines and commercial varieties of red clover (Trifolium pratense L.)

2017 ◽  
Author(s):  
Borislav Petkovic ◽  
Novo Przulj ◽  
Vojo Radic ◽  
Milan Mirosavljevic
Keyword(s):  
Grain Yield ◽  
Seed Production ◽  
Seed Yield ◽  
Trifolium Pratense ◽  
Seed Quality ◽  
Red Clover ◽  
Kernel Weight ◽  
Thousand Kernel Weight ◽  
Trifolium Pratense L ◽  
Clover Seed

Red clover (Trifolium pratense L.) is one of the most important forage legumes in areas with acidic and nutrient poorer soils where alfalfa fails to growth. In 2010-2011 years period we studied four advanced lines and four commercial varieties of red clover, which are widely used in the production in Bosnia and Herzegovina. Our results showed that the variation in grain yield, thousand kernel weight and germination energy was under control of growth. Across genotypes seed yield in 2010 and 2011 was 205 and 223 kg ha-1, respectively. The highest yield of seed was obtained from second growth in the second year. Extreme precipitation during anthesis and grain filling and ripening in 2010 negatively affected red clover seed production. Advanced line DS-2 had the highest grain yield (234 kg ha-1) and thousand kernel weight (1.75 g). Low seeds yields of the tested genotypes are questioning the cost-effectiveness of red clover seed production at this site.

INFLUENCE DES CULTIVARS ET DES STADES DE PRÉLÈVEMENT DE LA PREMIÈRE POUSSE SUR LA PRODUCTION DE SEMENCE DE TRÈFLE ROUGE

1990 ◽  
Vol 70 (4) ◽  
pp. 1071-1080 ◽  
Author(s):  
LUCIUS BELZILE
Keyword(s):  
Seed Germination ◽  
Seed Production ◽  
Seed Yield ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Kernel Weight ◽  
Climatic Conditions ◽  
Cultivar Group ◽  
Stage Of Development ◽  
Clover Seed

For five years, the effect of cultivars and vegetative stage of cutting were measured on red clover (Trifolium pratense L.) seed production. The first group of cultivars included Hungaropoli, Ottawa and Lakeland harvested in 1981 and 1982. The second group included Arlington, Florex and Prosper I harvested in 1984, 1985 and 1987. The total annual seed yield differed within cultivars and the highest seed yield was obtained with Hungaropoly and Florex. In the first cultivar group, the tetraploid Hungaropoly obtained a kernel weight higher than the diploids Lakeland and Ottawa. In the second group of cultivars, all diploids, Arlington yielded the highest kernel weight. The percentage of seed germination of Hungaropoly was higher than Lakeland and Ottawa while for Florex it was slightly higher than Arlington and Prosper I. A prior vegetative cutting is essential for good seed yield. In the absence of vegetative cutting seed weight seemed improved. The stage of development at which vegetative cutting is done has little influence on percentage seed germination. These results have shown that despite the strong effect of climatic conditions on seed production, the choice of the optimum stage for vegetative cutting and a well adapted cultivar are important aspects in successful seed production.Key words: Red clover, seed production, cultivar, stage of cutting

scholarly journals Boron application in red clover (Trifolium pratense L.) seed production

2015 ◽  
Vol 54 (1) ◽  
pp. 59-63 ◽  
Author(s):  
Dalibor Tomić ◽  
Vladeta Stevović ◽  
Dragan Đurović ◽  
Milomirka Madić ◽  
Nikola Bokan ◽  
...  
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Trifolium Pratense ◽  
Acid Soil ◽  
Red Clover ◽  
Relative Increase ◽  
Second Growth ◽  
Trifolium Pratense L ◽  
Second Year ◽  
Positive Effect

AbstractA field trial with four red clover cultivars was established on acid soil in order to evaluate the effect of foliar boron application on seed yield. The crop received foliar boron treatment during the second growth of the second year at two applications. Although seed yield showed a significant increase in boron-treated plants in 2011 compared with control (26.0%), its relative increase was far higher in 2010 (43.2%), which had increased total rainfall amounts during flowering. Sufficient level of boron supply to red clover plants for seed production has a remarkably positive effect under conditions hampering pollination and fertilisation.

Effet des types de sol sur la production de semence du trèfle rouge

1991 ◽  
Vol 71 (4) ◽  
pp. 1039-1046 ◽  
Author(s):  
Lucius Belzile
Keyword(s):  
Seed Production ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Climatic Conditions ◽  
Thousand Grain Weight ◽  
Light Soil ◽  
Different Types ◽  
Percent Germination ◽  
Trifolium Pratense L ◽  
Clover Seed

Red clover (Trifolium pratense L.) was grown for seed production after the seeding year on two different types of soils, in the same climatic area. An important difference in yield which was often related to cultivar and sometimes to year was observed between the two soils — the light soil, Saint-André gravelly loam, produced more seed than the heavy Kamouraska clay. Seed yield differed between cultivars with Florex and Arlington producing the most. On an annual basis, the thousand-grain weight was higher on Kamouraska than on Saint-André. The percent germination was not influenced by soil type and cultivar but variation between years was observed. The production of heads per plant was higher on Saint-André. The number of seeds produced per plant and per head was, as for yield, higher on Saint-André than Kamouraska. The influence of cultivars and years was not always visible on these last parameters. Therefore these results demonstrate that generally the success of red clover seed production depends not only on cultivar and climatic conditions, but that within the same climatic area the type of soil is a major factor. Key words: Red clover, seed production, soil effect, year of harvest, cultivar, yield components

EFFECTS OF ISOLATION DISTANCE AND BORDER REMOVAL ON CONTAMINATION IN RED CLOVER SEED PRODUCTION

1975 ◽  
Vol 55 (2) ◽  
pp. 391-395 ◽  
Author(s):  
P. PANKIW
Keyword(s):  
Seed Production ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Minor Degree ◽  
Trifolium Pratense L ◽  
Foundation Seed ◽  
Isolation Distance ◽  
Isolation Distances ◽  
Clover Seed ◽  
A Minor

A recessive white-flowered strain of the red clover (Trifolium pratense L.) cultivar LaSalle was used as a marker to study the effects of various isolation distances and border removal on contamination of small plots. The clover was pollinated primarily by honey bees (Apis mellifera L.) and to a minor degree by Bombus spp. When bloom on the contaminant area was equal to bloom on the marker plots, the contamination of contiguous (0–183 m), 50 m, 100 m, 183 m and 274 m was 5.0, 4.4, 3.4, 2.5 and 2.6%, respectively. When contaminant bloom was four times as great as bloom on marker plots, contamination was twice as high. Contamination was considerably higher in the perimeter of the plots, with a gradual decrease towards the center of the plots. It is suggested that the present isolation distance of 183 m, with a minimum of contaminant bloom in the area, be retained for the smaller acreages of foundation seed, but that for larger fields as occurs with certified seed production, border removal in lieu of isolation distance may be a practical alternative.

scholarly journals Review of seed yield components and pollination conditions in red clover (Trifolium pratense L.) seed production

Euphytica ◽  
2021 ◽  
Vol 217 (4) ◽  
Author(s):  
Shuxuan Jing ◽  
Per Kryger ◽  
Birte Boelt
Keyword(s):  
Reproductive Success ◽  
Seed Production ◽  
Seed Yield ◽  
Yield Components ◽  
Trifolium Pratense ◽  
Comprehensive Evaluation ◽  
Red Clover ◽  
Reproductive Traits ◽  
Seed Yield Components ◽  
Clover Seed

AbstractRed clover (Trifolium pratense L.) is an important forage legume grown in many of the temperate regions around the world. In order to evaluate possible causes for the low seed yield in particular in tetraploid red clover, we surveyed 71 studies of red clover seed production published from 1948 to 2019, reviewing seed yield components, pollination and reproductive traits. Seed yield components are recorded to contribute to and improve our understanding of the complex processes leading to the red clover seed yield. However, the measurement approaches varied largely among the studies, depending on whether the seed yield components are directly measured or calculated. Red clover seed production is dependent on insect pollen transfer. However, much uncertainty of pollination and reproductive success remains. Pollination conditions were often neglected: one third of the papers did not mention pollination conditions. The information that connects pollination and seed set are lacking, very few studies measured traits in floral morphology, ovule fertilisation and seed maturation. We suggest that consistent and comprehensive evaluation of pollination and reproductive success are required to improve our understanding of reasons for the low seed yield in red clover and hence the possibilities for future improvement.

MANAGEMENT OF MEDIUM RED CLOVER FOR SEED AND HAY PRODUCTION

1960 ◽  
Vol 40 (1) ◽  
pp. 21-28 ◽  
Author(s):  
J. E. Winch ◽  
W. E. Tossell
Keyword(s):  
Seed Yield ◽  
Seed Weight ◽  
Red Clover ◽  
Seedling Vigour ◽  
Early Seedling ◽  
Clover Seed ◽  
Seed Yields ◽  
Crop Seed

Higher seed yields of Redon red clover were produced from the aftermath following an early hay crop than from the first crop itself. Red clover-timothy mixtures produced more hay in June and more seed from the aftermath than did pure stands of red clover or red clover-bromegrass mixtures. Seeding rates of 3, 6, 9 and 12 lb. per acre had no effect on red clover seed yield but did affect hay yield. With 2 lb. of timothy, no increase in hay yield was obtained with red clover seeding rates above 6 lb. per acre.Red clover alone produced more seed per acre than red clover-timothy or red clover-brome mixtures when seed was harvested from the first crop. First-crop seed was higher in seed weight than second-crop seed and this was reflected in increased early seedling vigour.

scholarly journals Powdery Mildew Caused by Erysiphe pisi on Alfalfa in Idaho and Oregon

Plant Disease ◽  
2001 ◽  
Vol 85 (6) ◽  
pp. 678-678 ◽  
Author(s):  
S. K. Mohan ◽  
V. P. Bijman ◽  
D. R. Miller
Keyword(s):  
United States ◽  
Powdery Mildew ◽  
Seed Production ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Personal Communication ◽  
The United States ◽  
Erysiphe Pisi ◽  
Aerial Parts ◽  
Trifolium Pratense L

During July to November 2000, alfalfa (Medicago sativa L.) plants with powdery mildew symptoms were observed in commercial hay and seed fields, research plots, and a greenhouse in southwestern Idaho (Canyon County) and eastern Oregon (Malheur County). Affected leaves and stems showed white, effuse, dense, amphigenous mycelium bearing Oidium conidia, often with necrotic, brown blotches or streaks. In July, symptoms and signs were found mostly on the lower stems and leaves, but by October, all aerial parts of the plants were involved. Based on location of the mycelium and the conidiophore and conidial characteristics, the fungus was identified as Erysiphe pisi (J. C. David, personal communication). Cleistothecia were not observed. Natural incidence of the disease, which varied from less than 5% infected plants in July to more than 90% infected plants in November, was observed in commercial fields of cvs. Pioneer 53V08 (hay), Sparta (hay), and DS 907 (seed); in research (seed production) plots on cvs. Alfagraze, Anchor, Barrier, Beaver, Cut'N'Graze, Rambler, and Rangelander; and in the greenhouse on cvs. Aggressor, Archer II, Nemagone, Pecos, and Robust. Greenhouse inoculations by dusting with conidia from infected alfalfa plants (cv. Pioneer 53V08) demonstrated the susceptibility of alfalfa cvs. Affinity, Amerigraze, Innovator, and Salado and pea (Pisum sativum L.) cvs. Aladdin, Badger, Bolero, Cabree, Dwarf Gray Sugar, Early Perfection, Encore, Lazor, Maestro, Melting Sugar, Novella, Pursur, Somerwood, Spring, Stampede, and Sugar Ann. Red clover (Trifolium pratense L.) cvs. Redland, Redland II, and Premier showed positive but limited symptoms (smaller colonies, scant mycelium, and brown necrosis) following inoculation. Uninoculated control plants remained free from powdery mildew. Previous reports of powdery mildew on alfalfa in the United States (2) have attributed it to E. polygoni (Massachusetts and Wyoming) or Oidium sp. (Hawaii). Recently, powdery mildew caused by E. pisi was reported from alfalfa in research nurseries and greenhouses in Wisconsin (1). To our knowledge, this is the first report of occurrence of powdery mildew of alfalfa caused by E. pisi in the northwestern U.S., and may constitute a potential new problem for hay and seed production in this region. References: (1) J. I. Edmunds et al. Plant Dis. 82:832, 1998. (2) D. F. Farr et al. 1989. Fungi on Plants and Plant Products in the United States. APS Press, St. Paul, MN.

QTL analysis of seed yield components in red clover (Trifolium pratense L.)

2005 ◽  
Vol 112 (3) ◽  
pp. 536-545 ◽  
Author(s):  
Doris Herrmann ◽  
Beat Boller ◽  
Bruno Studer ◽  
Franco Widmer ◽  
Roland Kölliker
Keyword(s):  
Seed Yield ◽  
Qtl Analysis ◽  
Yield Components ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Seed Yield Components ◽  
Trifolium Pratense L
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