EFFECTS OF HARVEST TIME AND ALAR-85 ON SEED YIELD OF RED CLOVER

1990 ◽  
Vol 70 (3) ◽  
pp. 869-871 ◽  
Author(s):  
B. R. CHRISTIE ◽  
T. M. CHOO
Keyword(s):  
Seed Yield ◽  
Yield Components ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Harvest Time ◽  
Seed Setting ◽  
Seed Yield Components ◽  
Trifolium Pratense L ◽  
One Year ◽  
Seed Yields

Effects of harvest time and the growth regulator Alar-85 on seed yield and seed-yield components of red clover (Trifolium pratense L.) were studied. Data were collected from the primary growth (first crop) and from the aftermath (second crop). The second crop outyielded the first crop in one year and yielded the same in another year. Alar-85 shortened corolla tubes in all four cultivars and reduced plant height in three cultivars. It increased seed yields of the second crop of Dollard and Hungaropoli by more than 100%, through increases in seed setting and the number of heads per m2.Key words: Red clover, Trifolium pratense L., seed yield, Alar-85, harvest time

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

EFFECTS OF ROW SPACING AND SEEDING RATES ON SEED YIELD IN RED CLOVER, ALSIKE CLOVER AND BIRDSFOOT TREFOIL

1977 ◽  
Vol 57 (2) ◽  
pp. 413-418 ◽  
Author(s):  
P. PANKIW ◽  
S. G. BONIN ◽  
J. A. C. LIEVERSE
Keyword(s):  
Seed Yield ◽  
Trifolium Pratense ◽  
Seed Set ◽  
Red Clover ◽  
Birdsfoot Trefoil ◽  
Total Production ◽  
Seed Yield Components ◽  
Trifolium Pratense L ◽  
Seed Crops ◽  
Seed Yields

The effects of various row spacings and seeding rates on seed yield and certain seed yield components, viz, florets per head, seed set, seeds per pod, were studied on single seedings with three successive seed crops of red clover (Trifolium pratense L.), alsike clover (T. hybridum L.), and birdsfoot trefoil (Lotus corniculatus L.). Alsike clover and birdsfoot trefoil produced the highest yields at the narrow 15-cm spacing with successive decreases to the 60-cm spacing. The taller-growing and later-blooming, single-cut red clover was slightly more adaptable to varying spacings with the highest yields at 30- and 45-cm spacings, and slightly lower yields at the 15- and 60-cm spacings. All three crops competed successfully with weeds at the narrow spacings (15 and 30 cm). All three crops were able to compensate within limits in the 2nd and 3rd seed yr for differences in stand caused by different seeding rates. Seeding rates of 2.2 and 4.5 kg/ha were most favorable. Certain components of yield, e.g., florets per inflorescence, percent seed set, and seeds per pod, did not vary within years and are primarily affected by rainfall, soil fertility, pollinator populations and favorable pollinating weather. Differences in seed yields were attributable to total production of flower heads or racemes.

Seed Yield Components in Single Plants of Diverse Scandinavian Tetraploid Red Clover Populations (Trifolium pratense L.)

Crop Science ◽  
2016 ◽  
Vol 57 (1) ◽  
pp. 108-117 ◽  
Author(s):  
Helga Amdahl ◽  
Trygve S. Aamlid ◽  
Petter Marum ◽  
Åshild Ergon ◽  
Muath Alsheikh ◽  
...  
Keyword(s):  
Seed Yield ◽  
Yield Components ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Seed Yield Components ◽  
Trifolium Pratense L

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.

scholarly journals Heritabilities and phenotypic correlations for seed yield and seed yield components of beans

1969 ◽  
Vol 72 (2) ◽  
pp. 301-308
Author(s):  
Manuel Mateo Solano ◽  
James S. Beaver ◽  
Freddy Saladín García
Keyword(s):  
Seed Yield ◽  
Yield Components ◽  
Narrow Sense ◽  
Phenotypic Correlations ◽  
Seed Yield Components ◽  
F2 Generation ◽  
Seed Yields ◽  
Advanced Generation ◽  
Weight Number ◽  
100 Seed Weight

Indeterminate bean (Phaseolus vulgaris L.) lines derived from crosses between small-seeded indeterminate and large-seeded determinate genotypes were used to estimate the heritabilities and phenotypic correlations for seed yield and seed yield components. The F2  generation of six bean populations was planted at the Fortuna Substation, Juana Díaz, Puerto Rico, in October 1984. Seed yield per plant, 100 seed weight, number of pods per plant, and number of seed per pod were measured for 50 plants selected at random from each population. A total of 50 F3 plant rows of each population were planted in February 1985 at the Fortuna Substation, and in March 1985 on a small farm in the Constanza valley of the Dominican Republic. Narrow sense heritabilities were estimated by using parent-offspring regressions of the F2 and F3 generation, and phenotypic correlations were estimated by using means of the F3 lines. Mean seed yields per plant of the indeterminate F3 lines were significantly less than the indeterminate parents, whereas the 100-seed weights of the indeterminate F3 were significantly less than the determinate parents. Narrow sense heritabilities for seed yield and seed yield components were intemediate to low. These results indicate that selection for greater seed yield would be more effective by evaluating advanced lines in replicated trials. Spearman rank correlations between locations for seed yield and seed yield components varied among populations. Multilocation testing of advanced generation lines may be the most effective way to identify bean genotypes that perform well in contrasting environments.

Lodging studies in Lolium perenne grown for seed: 1. Seed yield and seed yield components

1978 ◽  
Vol 90 (2) ◽  
pp. 261-267 ◽  
Author(s):  
P. D. Hebblethwaite ◽  
A. Burbidge ◽  
D. Wright
Keyword(s):  
Seed Development ◽  
Lolium Perenne ◽  
Seed Yield ◽  
Perennial Ryegrass ◽  
Yield Components ◽  
Field Experiments ◽  
Unit Area ◽  
Seed Yield Components ◽  
Seed Yields ◽  
Number Of Seeds

SummaryThe effects of lodging on the seed yield of S. 23 and S. 24 perennial ryegrass were investigated in a series of field experiments from 1973 to 1976. Natural lodging severely reduced seed yield in all years as a result of a decrease in the number of seeds per unit area. Controlled lodging at different stages of crop growth produced more variable results, indicating that lodging may affect both pollination and seed development. Disturbance of the crop during anthesis in order to aid pollination did not improve seed yields, possibly as a result of damage incurred.

Irrigation and Nitrogen Studies in s. 23 Ryegrass Grown for Seed: 1. Growth, Development, Seed Yield Components and Seed Yield

1977 ◽  
Vol 88 (3) ◽  
pp. 605-614 ◽  
Author(s):  
P. D. Hebblethwaite
Keyword(s):  
Seed Yield ◽  
Yield Components ◽  
Seed Weight ◽  
Dry Matter ◽  
Field Experiments ◽  
Unit Area ◽  
Yield Response ◽  
Seed Yield Components ◽  
Seed Yields ◽  
Number Of Seeds

SUMMARYThe effects of irrigation and nitrogen on S. 23 perennial ryegrass grown for seed were investigated in a series of field experiments from 1972 to 1974. Irrigation significantly increased seed yield by 16% in 1972 and 52% in 1974 but had no effect in the wet year of 1973. In 1972 maximum deficit reached 110 mm at the end of July and coincided with anthesis. Consequently the yield response was due to an increase in number of seeds per unit area and no other seed yield component was affected. In 1974 peak deficit also reached about 100 mm but started to build up rapidly very early in the season and had reached 80 mm by the time that the first ears emerged. Consequently the yield response was due to increases in number of fertile tillers, number of seeds per unit area and 1000-seed weight.Irrigation had no significant effect on number of florets or seeds, except in 1974 when percentage of florets which produced seed was increased by 2%.Irrigation had some effect on threshed straw yields, total dry matter, harvest index and total number of tillers but where this occurred the response was much smaller than that of seed yield which indicates that irrigation had greater effects on the reproductive development of the crop than on yield of dry matter and tillering patterns. Increasing the quantity of nitrogen from 0 to 80 kg/ha increased seed yields, all seed yield components except 1000-seed weight, threshed straw yields and total dry matter and number of tillers at most sampling dates. Increasing the quantity of nitrogen from 80 to 160 kg/ha had little further effect on the above components except in 1972 where seed yields were significantly decreased.In 1972 number of florets was increased and percentage of florets which produced seed decreased with increasing quantities of nitrogen.

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 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.

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