Uncertainty and learning in a technologically dynamic industry: Seed density in U.S. maize

2021 ◽  
Author(s):  
Edward D. Perry ◽  
David A. Hennessy ◽  
GianCarlo Moschini
Keyword(s):  
Seed Density

Long‐term impact of legume‐based cropping with chemical and integrated fertilisation on viable weed seed density, diversity and community structure

Weed Research ◽  
2021 ◽  
Author(s):  
Chaitanya P. Nath ◽  
Kali K. Hazra ◽  
Chandra S. Praharaj ◽  
Ummed Singh ◽  
Sati S. Singh ◽  
...  
Keyword(s):  
Community Structure ◽  
Seed Density ◽  
Weed Seed ◽  
Long Term Impact

Soil environmental factors drive seed density across vegetation types on the Tibetan Plateau

2017 ◽  
Vol 419 (1-2) ◽  
pp. 349-361 ◽  
Author(s):  
Miaojun Ma ◽  
James W. Dalling ◽  
Zhen Ma ◽  
Xianhui Zhou
Keyword(s):  
Tibetan Plateau ◽  
Environmental Factors ◽  
The Tibetan Plateau ◽  
Seed Density ◽  
Vegetation Types ◽  
Soil Environmental Factors

scholarly journals The Effect of Seed Density on Nursery Media to Rice Transplanter Type Crown Indo Jarwo IHT 20-40 Performance.

2016 ◽  
Vol 17 (3) ◽  
pp. 155-164
Author(s):  
Joko Prasetyo ◽  
◽  
Gunomo Djoyowasito ◽  
Lazuardy Tembang ◽  
Dwi Purnomo ◽  
...  
Keyword(s):  
Seed Density

scholarly journals Germination rate and seedling vigour of tall fescue as affected by endophyte status and seed density

2007 ◽  
Vol 13 ◽  
pp. 271-274
Author(s):  
H.T. Owens ◽  
C.H. Finneseth ◽  
T.M. Tillery ◽  
T.D. Phillips
Keyword(s):  
Tall Fescue ◽  
Seed Quality ◽  
Germination Rate ◽  
Storage Conditions ◽  
Seed Density ◽  
Seedling Vigour ◽  
Density Fractions ◽  
Endophyte Infection ◽  
Early Germination ◽  
Air Column

Forage grass seed quality is influenced by plant genetics as well as seed density, storage conditions, age of seed, and endophyte infection status. We used eight seed lots of tall fescue (three cultivars, with natural endophytes, endophyte-free, or novel endophyte) to test the effect of seed density on germination and seedling vigour. Seed lots were separated into nine density fractions using a cylinder air column. Thousand seed weight values were determined. Three runs of four replications of plots consisting of 25 seeds of each entry were seeded in greenhouse experiments to determine seedling mass at 8 weeks after planting. Early germination counts as well as laboratory germination tests indicated significant differences among weight classes in speed of germination as well as seedling vigour. The lightest fraction of seed clearly contained inferior seed, but higher density seed lots tended to have better germination and seedling vigour than lower density ones. Keywords: seed density, seedling vigour, germination, tall fescue, endophyte

scholarly journals Characterization and ecological significance of a seed bank from the Upper Pennsylvanian Wise Formation, southwest Virginia

2017 ◽  
Vol 57 (2) ◽  
pp. 165-175 ◽  
Author(s):  
Petra S. Yehnjong ◽  
Michael S. Zavada ◽  
Chris Liu
Keyword(s):  
Seed Size ◽  
Seed Bank ◽  
Seedling Establishment ◽  
Environmental Variability ◽  
Seed Banks ◽  
Evolutionary Strategy ◽  
Predator Population ◽  
Seed Density ◽  
Soil Seed Banks ◽  
Large Seed

AbstractSoil seed banks are important to the maintenance and restoration of floras. Extant seed banks exhibit unique characteristics with regard to the distribution of seed size and seed density. Seeds were recovered from the Upper Pennsylvanian Wise Formation in southwest Virginia. Structurally preserved seeds were also examined from coal balls of the Pennsylvanian Pottsville and Allegheny Groups, Ohio. The size distribution of the seeds from the Wise Formation is similar to that of structurally preserved seeds of the Upper Pennsylvanian Pottsville and Allegheny Group coal balls. In contrast, the seed size distributions in extant wetland, grassland, woodland and forest habitats are significantly narrower than that of seeds from the Pennsylvanian seed banks. Larger seeds are less dependent on light for germination, and aid in seedling establishment more than smaller seeds, especially in dense stable forests where disturbance events are rare. Large seed size may contribute to increased seed longevity, which reduces the effect of environmental variability on seed germination and development. The significantly larger size of the Palaeozoic seeds may have imparted an advantage for seedling establishment in the dense Palaeozoic forests. The preponderance of large seeds may be a result of the absence of large seed predators (e.g. herbivorous tetrapods), and may have been an evolutionary strategy to minimize damage to the embryo from a predator population dominated by small invertebrates with chewing or sucking mouthparts. The estimated seed density of 192 seeds/m2in the Palaeozoic seed bank falls within the range of modern seed banks, but at the lower end of modern seed bank densities in a variety of habitats.

Pea growth and ion accumulation at varying seed density

1970 ◽  
Vol 12 (2) ◽  
pp. 167-179 ◽  
Author(s):  
Z. Laštůvka ◽  
J. Minář
Keyword(s):  
Ion Accumulation ◽  
Seed Density

scholarly journals Seed density is more effective than multi-trait limiting similarity in controlling grassland resistance against plant invasions in mesocosms

2018 ◽  
Vol 21 (3) ◽  
pp. 411-418 ◽  
Author(s):  
Florencia A. Yannelli ◽  
Gerhard Karrer ◽  
Rea Hall ◽  
Johannes Kollmann ◽  
Tina Heger
Keyword(s):  
Plant Invasions ◽  
Limiting Similarity ◽  
Seed Density

Postdispersal Predation of Velvetleaf (Abutilon theophrasti) Seeds

Weed Science ◽  
1996 ◽  
Vol 44 (3) ◽  
pp. 534-539 ◽  
Author(s):  
John Cardina ◽  
Heather M. Norquay ◽  
Benjamin R. Stinner ◽  
David A. McCartney
Keyword(s):  
Late Summer ◽  
Soil Surface ◽  
Predation Rate ◽  
Agrotis Ipsilon ◽  
Seed Density ◽  
No Tillage ◽  
Decay Function ◽  
Seed Loss ◽  
Arion Subfuscus ◽  
Moldboard Plow

Studies were conducted from 1989 to 1993 in continuous no-tillage and moldboard plow corn fields to describe rates of velvetleaf seed predation with time and with seed density, and to identify principal seed predators. Rates of seed loss from the soil surface averaged 1 to 57% day−1and were equivalent in the two tillage systems. Predator populations were the same in no-tillage and moldboard plow fields. The predation rate was generally low in winter months, increased in mid-summer, and declined in late summer. In 2 of the 4 yr, predation increased in October and November. The predation rate was described by an exponential decay function of seed density, with high rates of seed loss at low densities and leveling off to a nearly constant level at densities above 600 seeds m−2. Predation was highest where seed access was not restricted, and exclosures of 6.5 and 1.6 cm2reduced predation up to 15 and 52%, respectively. Mice were important predators in the field. In laboratory feeding studies, the carabid beetleAmara cupreolata, the slugsArion subfuscusandDeroceras reticulatum, and cutworms (Agrotis ipsilon) consumed imbibed velvetleaf seeds.Amara cupreolataand A.subfuscuswere the only predators to damage unimbibed velvetleaf seeds.

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