The effect of late fall seeding time on the seed production of Italian ryegrass

2015 ◽  
Vol 95 (4) ◽  
pp. 641-645
Author(s):  
Bruce Coulman ◽  
Heather Loeppky ◽  
Martin Entz
Keyword(s):  
Seed Production ◽  
Great Plains ◽  
Seed Yield ◽  
Reproductive Development ◽  
Italian Ryegrass ◽  
Western Canada ◽  
Crop Species ◽  
Stand Establishment ◽  
Late Fall ◽  
Seeding Time

Coulman, B., Loeppky, H. and Entz, M. 2015. The effect of late fall seeding time on the seed production of Italian ryegrass. Can. J. Plant Sci. 95: 641–645. Italian ryegrass (Lolium multiflorum Lam.) is a cool-season grass, which behaves as an annual in the Great Plains region of western Canada and is used as a grazing crop. Italian ryegrass requires vernalization for reproductive development to occur. Late fall (dormant) seedings, which have been used for annual crop species, have often resulted in earlier developing seedlings in the spring and higher yield than spring seedings. For Italian ryegrass, dormant seedings may result in vernalization of early-spring-germinating seedlings, allowing seed production without having to overwinter established plants. The objective of this study was to compare the seed yield and stand establishment of late fall (dormant) and spring seedings of Italian ryegrass at three locations in the Great Plains region of western Canada. Stand establishment was assessed by measuring tiller density in the month of June, and these densities were greater for spring than late fall seedings. Most spring seedings had no reproductive development and, thus, no seed yield; however, most late fall seedings produced seed the following year, indicating that vernalization of early-developing seedlings did occur. There were significant differences in seed yield among the four cultivars tested and among sites. Based on the high variation in seed yield among cultivars and sites and the relatively low yield levels obtained, late fall seedings of Italian ryegrass cannot be recommended in the Great Plains region of western Canada.

scholarly journals Effect of Planting Method and Seeding Date on Leaf and Seed Production of Lettuce

2019 ◽  
pp. 1-12
Author(s):  
M. Shahinul ◽  
M. Rahman ◽  
M. M. R. Salim ◽  
B. Ahmed ◽  
M. H. Rashid
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Block Design ◽  
Direct Seeding ◽  
Dry Matter Content ◽  
Quality Traits ◽  
Treatment Combination ◽  
Leaf Yield ◽  
Seeding Time ◽  
Planting Method

Aim: The objective of this study is to identify the suitable planting method and seeding time for leaf and seed production of lettuce. Place and Duration: A field study was carried out in Bangadandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur Bangladesh during 2012-13. Materials and Design: A commercial lettuce variety BSMRAU lettuce-1 was used in this study. The experiment was laid out in a randomized complete block design with three replications and two factors, namely planting method (M1 – transplanted seedling produced on nursery bed, M2 - transplanted seedling produced in polybag and M3 - direct seeding) and seeding time (T1 - 16 October, T2 - 1 November, T3 - 16 November, T4 - 1 December and T5 - 16 December). Results: Analyses of variance revealed with a statistically significant variation (p<0.01 or p<0.05) among the treatments. The treatment interaction revealed that the highest leaf yield 27.33 t/ha was harvested from M3T2, which was statistically similar with M2T2 (26.78 t/ha). On the other hand, the highest seed yield 412.00 kg/ha was harvested from the treatment combination of M3T2, which was statistically different from all other treatment combinations. Quality traits viz. dry matter content, fiber content and organoleptic test were also better in early seeding. Conclusion: Considering leaf yield, seed yield and quality traits, direct seeding at 1 November was found to be the most suitable treatment combination for leaf and seed production of lettuce in Bangladesh conditions. But transplanting with polybag raised seedlings may be suitable if the land is occupied by the pervious crops.

scholarly journals The effect of vegetation area size on grass seed yield

2003 ◽  
Vol 48 (1) ◽  
pp. 125-134 ◽  
Author(s):  
Savo Vuckovic ◽  
Aleksandar Simic ◽  
Branko Cupina ◽  
Ivana Stojanovic ◽  
R. Stanisavljevic
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Perennial Ryegrass ◽  
Tall Fescue ◽  
Italian Ryegrass ◽  
Row Spacing ◽  
Meadow Fescue ◽  
Grass Seed ◽  
The World ◽  
Seed Yields

This paper surveys sowing norms (row spacing and seed rate) in both our country and the world, as well as the optimal seed rates in grass seed production. It gives a short overview of row spacings and seed rates applied in our and some other countries. Earlier, grass cultivated for the purpose of seed production was grown on small vegetation area. According to some researches, high seed yields can be achieved by cultivating grass on large vegetation area. Based on the results obtained, it can be concluded that the highest cocksfoot, timothy, meadow fescue, tall fescue seed yield was achieved with plants grown in 50 cm spaced rows employing lower seed rates (8 and 4 kg/ha of seeds). The highest Italian ryegrass and perennial ryegrass seed yield was achieved with plants grown in 20 cm spaced rows employing 20 kg/ha of seeds.

Effects of fall dormancy of alfalfa on seed production at a northern latitude

2003 ◽  
Vol 1 (1) ◽  
pp. 67-74
Author(s):  
D. T. Fairey ◽  
N. A. Fairey ◽  
L. P. Lefkovitch ◽  
J. A. C. Lieverse
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Western Canada ◽  
Total Biomass ◽  
Peace River ◽  
Northern Latitudes ◽  
River Region ◽  
Fall Dormancy ◽  
Alfalfa Varieties ◽  
Seed Crops

AbstractThe agri-climatic adaptation of an alfalfa variety in North America is categorized by its Fall Dormancy Rating (FDR1 = dormant to FDR9 = non-dormant). Presently, only relatively dormant, winter-hardy varieties (FDR1–4) are grown for seed and herbage at the northern latitudes of western Canada. However, there is considerably greater demand for seed of varieties that have FDR ≥ 4. A study was conducted in the Peace River region of north-western Canada to determine the relationship between FDR and seed production of alfalfa with FDR ≥ 4. Trials were established in each of two consecutive years with four varieties representing each of six FDR categories, FDR4–9. Growth characteristics were determined for two successive years of seed crops for each year of establishment. Seed yield (as a percentage of that for FDR4) was 84, 52, 40, 29 and 39% for FDR5 to FDR9, respectively, whereas total biomass at seed maturity was 89,73, 73, 57 and 57% for FDR5 to FDR9, respectively. Seed yield was more sensitive to changes in FDR than total biomass. Short rotations of specific alfalfa varieties with FDR ≥ 4 could be an option for seed growers in the northerly latitudes of western Canada, provided greater financial compensation is given for higher FDR varieties, and provided genetic drift can be retained within acceptable limits.

scholarly journals Paclobutrazol Improves Sesame Yield by Increasing Dry Matter Accumulation and Reducing Seed Shattering Under Rainfed Conditions

2021 ◽  
Author(s):  
Muhammad Zeeshan Mehmood ◽  
Ghulam Qadir ◽  
Obaid Afzal ◽  
Atta Mohi Ud Din ◽  
Muhammad Ali Raza ◽  
...  
Keyword(s):  
Leaf Area ◽  
Seed Production ◽  
Seed Yield ◽  
Dry Matter ◽  
Biomass Accumulation ◽  
Total Biomass ◽  
Dry Matter Accumulation ◽  
Seed Shattering ◽  
Rainfed Conditions ◽  
Leaf Greenness

AbstractSeveral biotic and abiotic stresses significantly decrease the biomass accumulation and seed yield of sesame crops under rainfed areas. However, plant growth regulators (such as Paclobutrazol) can improve the total dry matter and seed production of the sesame crop. The effects of the paclobutrazol application on dry matter accumulation and seed yield had not been studied before in sesame under rainfed conditions. Therefore, a two-year field study during 2018 and 2019 was conducted with key objectives to assess the impacts of paclobutrazol on leaf greenness, leaf area, total dry matter production and partitioning, seed shattering, and seed yield of sesame. Two sesame cultivars (TS-5 and TS-3) were treated with four paclobutrazol concentrations (P0 = Control, P1 = 100 mg L−1, P2 = 200 mg L−1, P3 = 300 mg L−1). The experiment was executed in RCBD-factorial design with three replications. Compared with P0, treatment P3 improved the leaf greenness of sesame by 17%, 38%, and 60% at 45, 85, and 125 days after sowing, respectively. However, P3 treatment decreased the leaf area of sesame by 14% and 20% at 45 and 85 days after sowing than P0, respectively. Compared with P0, treatment P3 increased the leaf area by 46% at 125 days after sowing. On average, treatment P3 also improved the total biomass production by 21% and partitioning in roots, stems, leaves, capsules, and seeds by 23%, 19%, 23%, 22%, and 40%, respectively, in the whole growing seasons as compared to P0. Moreover, under P3 treatment, sesame attained the highest seed yield and lowest seed shattering by 27% and 30%, respectively, compared to P0. This study indicated that by applying the paclobutrazol concentration at the rate of 300 mg L−1 in sesame, the leaf greenness, leaf areas, biomass accumulation, partitioning, seed yield, and shatter resistance could be improved. Thus, the optimum paclobutrazol level could enhance the dry matter accumulation and seed production capacity of sesame by decreasing shattering losses under rainfed conditions.

Increase Longleaf Pine Seed Yields by Inhibiting Conelet Abortion

1987 ◽  
Vol 11 (1) ◽  
pp. 6-9 ◽  
Author(s):  
Robert C. Hare
Keyword(s):  
Boric Acid ◽  
Seed Production ◽  
Seed Yield ◽  
Longleaf Pine ◽  
Foliar Spray ◽  
Seed Yields

Abstract A single foliar spray with either antiethylene compounds or cytokinins shortly after anthesis reduced conelet abortion by half and doubled seed production. Spraying with boric acid plus Cytex® , a relatively economical form of cytokinin derived from seaweed, was equally effective,and addition of certain antiethylene compounds further improved seed yield. South. J. Appl. For. 11(1):6-9.

Interference and Seed Production by Common Lambsquarters (Chenopodium album) in Soybeans (Glycine max)

Weed Science ◽  
1990 ◽  
Vol 38 (2) ◽  
pp. 113-118 ◽  
Author(s):  
S. Kent Harrison
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Chenopodium Album ◽  
Soybean Seed ◽  
Dry Weight ◽  
Threshold Level ◽  
Yield Reduction ◽  
Significant Treatment ◽  
Weed Biomass ◽  
Common Lambsquarters

Multiple regression and response surface plots were used to analyze the effects of common lambsquarters population density and interference duration on weed growth and soybean seed yield. Under favorable growing conditions in 1986, weed biomass production at all population densities and interference durations was four to five times that produced in 1987, under less favorable conditions. However, there was no significant treatment by year interaction for soybean seed yield reduction by common lambsquarters, and production of each kg/ha weed biomass resulted in an average soybean yield reduction of 0.26 kg/ha. Utilizing 5% yield loss as an arbitrary threshold level, the regression equation predicted a common lambsquarters density threshold of 2 plants/m of row for 5 weeks of interference after crop emergence and 1 plant/m of row for 7 weeks. Seed production by individual common lambsquarters plants was highly correlated (r=0.92) with weed dry weight, and seed production ranged from 30 000 to 176 000 seeds/plant.

Canola seed yield and phenological responses to plant density

2016 ◽  
Vol 96 (1) ◽  
pp. 151-159 ◽  
Author(s):  
Gan Yantai ◽  
K. Neil Harker ◽  
H. Randy Kutcher ◽  
Robert H. Gulden ◽  
Byron Irvine ◽  
...  
Keyword(s):  
Seed Yield ◽  
Plant Density ◽  
Block Design ◽  
Positive Association ◽  
High Yield ◽  
Western Canada ◽  
Flowering Period ◽  
Canola Seed ◽  
Randomized Complete Block Design ◽  
Plant Densities

Optimal plant density is required to improve plant phenological traits and maximize seed yield in field crops. In this study, we determined the effect of plant density on duration of flowering, post-flowering phase, and seed yield of canola in diverse environments. The field study was conducted at 16 site-years across the major canola growing area of western Canada from 2010 to 2012. The cultivar InVigor® 5440, a glufosinate-resistant hybrid, was grown at five plant densities (20, 40, 60, 80, and 100 plants m−2) in a randomized complete block design with four replicates. Canola seed yield had a linear relationship with plant density at 8 of the 16 site-years, a quadratic relationship at 4 site-years, and there was no correlation between the two variables in the remaining 4 site-years. At site-years with low to medium productivity, canola seed yield increased by 10.2 to 14.7 kg ha−1 for every additional plant per square metre. Averaged across the 16 diverse environments, canola plants spent an average of 22% of their life cycle flowering and another 27% of the time filling seed post-flowering. Canola seed yield had a negative association with duration of flowering and a positive association with the days post-flowering but was not associated with number of days to maturity. The post-flowering period was 12.7, 14.7, and 12.6 d (or 55, 68, and 58%) longer in high-yield experiments than in low-yield experiments in 2010, 2011, and 2012, respectively. We conclude that optimization of plant density for canola seed yield varies with environment and that a longer post-flowering period is critical for increasing canola yield in western Canada.

Evaluation of locations for testing dry bean cultivars in western Canada using statistical procedures, biological interpretation and multiple traits

1993 ◽  
Vol 73 (4) ◽  
pp. 985-994 ◽  
Author(s):  
G. Saindon ◽  
G. B. Schaalje
Keyword(s):  
Cluster Analysis ◽  
Seed Yield ◽  
Seed Weight ◽  
Visual Assessment ◽  
Western Canada ◽  
Multiple Traits ◽  
Dry Bean ◽  
Biological Interpretation ◽  
Environmental Events ◽  
High Level

Genotype × environment (GE) effects in regional registration trials for dry beans in western Canada were studied to determine whether geographic distribution of sites could be rationalized. The structure of the GE effects on the maturity, seed weight and seed yield of seven dry bean check cultivars grown at eight locations during 4 yr was investigated using GE mean squares decomposition, cluster analysis and the additive main effect and multiplicative interaction (AMMI) method. The analyses revealed a high level of redundancy in the locations which suggested that most GE effects can be captured with fewer testing sites. The partition of the GE mean squares demonstrated the possibility of reproducing the GE structure of the entire data sets with as few as three sites; however, more locations may be needed to compensate for unpredictable environmental effects. Based on biological interpretation of groupings and visual assessment of the AMMI displays, a five-location set fully represented the GE effects on maturity, seed weight and seed yield and accounted for the inconsistent clustering of the Brooks site for the three traits. Also, the set should allow for site losses due to unpredictable environmental events. The dry bean industry in western Canada is expanding to non-traditional growing areas and the establishment of trials in these areas should be considered as they may create GE effects not considered to date. Key words: Phaseolus vulgaris L., genotype × environment interactions, cluster analysis, AMMI analysis

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

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