SEED PRODUCTION AND GROWTH OF MODIOLUS CAPAX CONRAD (BIVALVIA: MYTILIDAE) IN LABORATORY CONDITIONS

2007 ◽  
Vol 26 (4) ◽  
pp. 1075-1080 ◽  
Author(s):  
CLAUDIA FARFÁN ◽  
MIGUEL ROBLES MUNGARAY ◽  
SAÚL JAIME SERRANO-GUZMÁN
Keyword(s):  
Seed Production ◽  
Laboratory Conditions

A Postfire Chronosequence of Cone, Follicle and Seed Production in Banksia ornata

1986 ◽  
Vol 34 (4) ◽  
pp. 425 ◽  
Author(s):  
AM Gill ◽  
A Mcmahon
Keyword(s):  
Seed Production ◽  
Seedling Establishment ◽  
Quantitative Research ◽  
Weather Conditions ◽  
Fire Intensity ◽  
Stand Age ◽  
Laboratory Conditions ◽  
Western Victoria ◽  
North Western ◽  
Seasonal Weather

The fire-sensitive shrub Banksia ornata relies on seed stored in serotinous 'cones' for its regeneration. Seed release takes place largely as a result of fire but a very small percentage of fruits may open spontaneously. In a chronosequence studied in heaths of the Little Desert of north-western Victoria, we found no seedling establishment in the absence of fire except in the oldest stand, dated at 50+ years since fire. Seed quantity was low in stands 6-7 years old but rose to a peak in the 38-year-old stand. The decline of seed quantity in the 50+ year-old stand was due to dieback and death of bushes. There was no evidence for an increase in the proportion of seeds predated with age of stand. An average of about 70% of the seed was regarded as 'intact' (no sign of damage) and about 80% of these seeds germinated under ideal laboratory conditions. It was estimated that the amount of seed available for regeneration increased with stand age up to 38 years but declined by 50+ years. It was suggested that a period of 16 years without fire could be needed to achieve stand replacement of populations of this species. The age at which full replacement can be achieved will vary, however, according to fire intensity and seasonal weather conditions. Further quantitative research is needed.

scholarly journals The features of primary seed production of winter bread wheat

2020 ◽  
pp. 80-85
Author(s):  
Yu. G. Skvortsova ◽  
Т. I. Firsova ◽  
N. G. Chertkova ◽  
G. A. Filenko
Keyword(s):  
Bread Wheat ◽  
Seed Production ◽  
Seed Weight ◽  
Rejection Rate ◽  
Field Trials ◽  
Family Selection ◽  
Seed Productivity ◽  
Laboratory Conditions ◽  
Winter Bread Wheat ◽  
High Quality Seed

The current paper has presented the features of primary seed production of winter bread wheat in the Rostov region and highlighted the main methods of varietal renewal, which make it possible to obtain high-quality seed material with strict preservation of their purity, biological and productive traits, in the amounts that meet the needs of the farms. The purpose of the research was to organize primary seed production of new and commercial varieties of winter bread wheat, which allows maintaining varietal purity and providing the required number of seeds of higher reproductions. There have been conducted the field trials to identify the best indicators of seed productivity, varietal and sowing qualities in the primary links of seed production. Seed production is based on individual-family selection with a two-year assessment of the progeny. The main percentage of variety rejection in the laboratory conditions was made according to such indicators as 1000 seed weight, family productivity, uniformity and plump condition of kernels within the family. In PIP-1 the rejection among the varieties ‘Volnitsa', ‘Volny Don', ‘Zhavoronok', ‘Polina', ‘Ambar', ‘Donskaya Stepp', ‘Yubiley Dona' was carried out for all indicators from 16 to 32%. The variety ‘Zhavoronok' was found the best according to the indicators and its rejection rate was 7%. In PIP-2 over the years of variety trials, the studied varieties of winter bread wheat were rejected in the field for all indicators from 2 to 7%. In the laboratory conditions, the rejection rate was slightly different and ranged from 1 to 8%. The highest seed productivity was formed by the varieties ‘Zernogradka 11' (11.2 t/ha), ‘Ermak' (10.8 t/ha), ‘Marafon' (11.5 t/ha) and ‘Krasa Dona' (11.5 t/ha). The percentage of seed productivity of the studied varieties varied from 67.4% to 93.3%. The maximum 1000 seed weight was identified in the varieties ‘Krasa Dona' (52.7 g), ‘Volny Don' (49.8 g), ‘Volnitsa' (49.1 g). The indicators of the main varietal and sowing qualities of winter wheat seeds corresponded to GOST R 52325-2005. 

Human drug taking under controlled laboratory conditions.

1988 ◽  
Author(s):  
Marian W. Fischman ◽  
Richard W. Foltin ◽  
Joseph V. Brady
Keyword(s):  
Laboratory Conditions

Multiple recycling of paperboard: Paperboard characteristics and maximum number of recycling cycles— Part I: Multiple recycling of corrugated base paper

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 631-638
Author(s):  
FREDERIC KREPLIN ◽  
HANS-JOACHIM PUTZ ◽  
SAMUEL SCHABEL
Keyword(s):  
Compression Test ◽  
Production Capacity ◽  
Strength Properties ◽  
Paper Properties ◽  
Corrugated Board ◽  
Laboratory Conditions ◽  
Base Paper ◽  
Study Results ◽  
Short Span ◽  
Multiple Recycling

Paper for recycling is an important fiber source for the production of corrugated base paper. The change in production capacity toward more and more packaging papers affects the composition of paper for recycling and influences the paper quality. This research project investigated the influence of the multiple recycling of five different corrugated base papers (kraftliner, neutral sulfite semichemical [NSSC] fluting, corrugating medium, testliner 2, and testliner 3) on suspension and strength properties under laboratory conditions. The corrugated board base papers were repulped in a low consistency pulper and processed into Rapid-Köthen laboratory sheets. The sheets were then recycled up to 15 times in the same process. In each cycle, the suspension and the paper properties were recorded. In particular, the focus was on corrugated board-specific parameters, such as short-span compression test, ring crush test, corrugating medium test, and burst. The study results indicate how multiple recycling under laboratory conditions affects fiber and paper properties.

Mechanoactivation Of Rice Husk Ash In Laboratory Conditions

2019 ◽  
pp. 20-26
Keyword(s):  
Mechanical Activation ◽  
Rice Husk ◽  
Amorphous Silica ◽  
Silicon Oxide ◽  
Rice Husk Ash ◽  
Pozzolanic Activity ◽  
Maximum Solubility ◽  
Laboratory Conditions ◽  
Before And After ◽  
Mineral Additive

In many rice producing countries of the world, including in Vietnam, various research aimed at using rice husk ash (RHA) as a finely dispersed active mineral additive in cements, concrete and mortars are being conducted. The effect of the duration of the mechanoactivation of the RHA, produced under laboratory conditions in Vietnam, on its pozzolanic activity were investigated in this study. The composition of ash was investigated by laser granulometry and the values of indicators characterizing the dispersion of its particles before and after mechanical activation were established. The content of soluble amorphous silicon oxide in rice husk ash samples was determined by photocolorimetric analysis. The pizzolanic activity of the RHA, fly ash and the silica fume was also compared according to the method of absorption of the solution of the active mineral additive. It is established that the duration of the mechanical activation of rice husk ash by grinding in a vibratory mill is optimal for increasing its pozzolanic activity, since it simultaneously results in the production of the most dispersed ash particles with the highest specific surface area and maximum solubility of the amorphous silica contained in it. Longer grinding does not lead to further reduction in the size of ash particles, which can be explained by their aggregation, and also reduces the solubility of amorphous silica in an aqueous alkaline medium.

Some insects affecting Penstemon seed production

2012 ◽  
Vol 13 (2) ◽  
pp. 107-111
Author(s):  
R. Hammon ◽  
M. Franklin
Keyword(s):  
Seed Production

PRIMING AS THE FACTOR OF INCREASE OF EFFICIENCY SEED PRODUCTION OF BIRDSFOOT TREFOIL

2020 ◽  
Author(s):  
Vladimir Zolotarev
Keyword(s):  
Seed Production ◽  
Characteristic Property ◽  
Seed Priming ◽  
Lotus Corniculatus ◽  
Birdsfoot Trefoil ◽  
Germination Energy ◽  
Field Germination

A characteristic property of legumes is the formation of hard-stone seeds. To use such seeds for sowing, it is necessary to carry out measures to increase their seeding indicators. The article provides an overview of methods of pre-sowing preparation of seeds, priming (Seed Priming). The harvest of Birdsfoot trefoil (Lotus corniculatus L.) can contain up to 90% or more hard-stone seeds. Mechanical priming of hard-stone seeds of Birdsfoot trefoil increases their germination energy and field germination.

Onion sets as planting material for seed production of three cultivars in Uruguay

2016 ◽  
Vol 44 (3) ◽  
pp. 500-513
Author(s):  
S. Peluffo ◽  
H. González Idiarte ◽  
A. Borges ◽  
J. Arboleya ◽  
G.A. Galván
Keyword(s):  
Seed Production ◽  
Planting Material
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