RED PINE SEEDFALL IN SOUTHEASTERN MANITOBA

1964 ◽  
Vol 40 (1) ◽  
pp. 78-85 ◽  
Author(s):  
J. H. Cayford
Keyword(s):  
Seed Dispersal ◽  
Seed Quality ◽  
Jack Pine ◽  
Red Pine ◽  
Seed Crop ◽  
Clear Cut ◽  
Rainy Weather ◽  
Seed Collections ◽  
Made In

Between September 1957 and August 1962 periodic red pine seed collections were made in a cut-over stand that originally supported a mixture of red and jack pine. A partially cut area and one-chain-wide clear-cut strips, from which all jack pine were cut, were sampled. During the five-year period, 5.5 and 11.2 pounds of seed per acre were dispersed on strip-cut and partial-cut areas, respectively. Maximum dispersal occurred during the autumn, except in 1959 when cool, rainy weather delayed seed dispersal. Seed quality varied directly with size of seed crop and with intensity of seed dispersal.

scholarly journals Studies on the hypophysectomised ferret. II. - Spermatogenesis

1932 ◽  
Vol 112 (775) ◽  
pp. 146-152 ◽  
Keyword(s):  
Body Weight ◽  
Pituitary Gland ◽  
Reproductive Tract ◽  
Complete Loss ◽  
Male Rat ◽  
Seminiferous Tubules ◽  
Clear Cut ◽  
Resulting Condition ◽  
Made In ◽  
Male Genital

Smith (1930) has shown that all parts of the reproductive tract of the male rat show pronounced atrophy after hypophysectomy. The testes are much reduced in size and are flabby. The seminiferous tubules show a corresponding diminution in size and all indications of spermatogenesis are absent. A more immediate effect of ablation of the pituitary gland is a complete loss of interest in the female. Richter and Wislocki (1930) also noted atrophy of the male genital organs of the rat after hypophysectomy, but in no great detail. Hypophysectomy has not yet been performed on a species in which the male shows a clear cut anœstrous period such as is found in the male ferret (Allanson, 1932). The present work was undertaken to find out if the testes of the ferret react to hypophysectomy in the same way as those of the rat, and to compare the resulting condition of the testes with that found during anœstrus. Further light on the activity of the pituitary body during anœstrus might thus be obtained. In addition, it was hoped to determine the rate of regression after hypophysectomy and to compare this with that found at the end of the breeding season. No attempt will be made in this or the following paper to deal with the general effects of hypophysectomy, but it may be mentioned that loss of body weight, if any, was slight during the time covered by these experiments.

Estimation de la production de jeunes plantations de pin rouge et de pin gris du sud du Québec

1976 ◽  
Vol 6 (4) ◽  
pp. 478-486 ◽  
Author(s):  
H. A. Bolghari
Keyword(s):  
Multiple Regression ◽  
Jack Pine ◽  
Red Pine ◽  
Pine Plantations ◽  
Regression Equations ◽  
Pine Plantation ◽  
South Shore ◽  
Pine Stands ◽  
Natural Stands ◽  
St Lawrence River

Multiple regression equations have been developed to predict yield from young red pine and jack pine plantations. Data from 446 sample plots representing young red pine and jack pine stands located on the south shore of the St. Lawrence River between Quebec and Montreal were analysed. The red pine plantation yielded more than the jack pine. However, in plantation both species yield more than in natural stands. Taking into account the age and spacing of the sampled plantations, the equation obtained can provide information on yield of red pine and jack pine stands the maximum spacing of which is 3 × 3 m, up to the age of 45 and 35 years respectively. The equations will allow the construction of preliminary yield tables for both species.

Pathogenicity of Bursaphelenchusxylophilus on three species of pine

1987 ◽  
Vol 17 (1) ◽  
pp. 51-57 ◽  
Author(s):  
P. J. Bedker ◽  
M. J. Wingfield ◽  
R. A. Blanchette
Keyword(s):  
Jack Pine ◽  
Red Pine ◽  
Pine Wood Nematode ◽  
Pine Wood ◽  
Water Extracts ◽  
Pine Trees ◽  
Branch Death

Three species of 11-year-old pine trees were inoculated with Bursaphelenchusxylophilus in the field. Four branches in single whorls on red, Scots, and jack pine trees were wounded and inoculated with 10 000 nematodes each or with water extracts from Botrytiscinerea cultures. Prior to field inoculations, the pathogenicity of the nematode isolate was confirmed on seedlings in the greenhouse. Fourteen weeks after inoculation, 27 of 80 and 13 of 52 branches were dead or dying on Scots and jack pine trees, respectively. No symptoms were observed on red pine trees inoculated with B. xylophilus or on any controls. Branch death was attributed to the formation of girdling cankers resulting from inoculation. An average of 9.14, 10.39, and 0.02 nematodes were extracted per gram of wood from branch samples collected from Scots, jack, and red pine trees at 14 weeks, respectively, and at 58 weeks an average of 13.82, 1.01, and 0.05 nematodes per gram of wood sampled were recovered. Proportions of branch samples with nematodes declined from 14 to 58 weeks after inoculation. Although limited mortality of branches occurred, the pine wood nematode was not found to cause tree death following inoculation.

Prairie Thunder flax

2014 ◽  
Vol 94 (2) ◽  
pp. 445-449 ◽  
Author(s):  
S. D. Duguid ◽  
K. Y. Rashid ◽  
E. O. Kenaschuk
Keyword(s):  
Fusarium Oxysporum ◽  
Linum Usitatissimum ◽  
Seed Quality ◽  
Agronomic Traits ◽  
Research Station ◽  
Linum Usitatissimum L ◽  
The Cross ◽  
Made In

Duguid, S. D., Rashid, K. Y. and Kenaschuk, E. O. 2014. Prairie Thunder flax. Can. J. Plant Sci. 94: 445–449. Prairie Thunder, medium-maturing oilseed flax (Linum usitatissimum L.), was released in 2006 by Agriculture and Agri-Food Canada, Morden Research Station, Morden, Manitoba. Developed from the cross AC Watson/FP1043 made in 1995, Prairie Thunder was evaluated in the Flax Cooperative Trials (2002–2004) before being registered in 2006. Prairie Thunder's desirable combination of improved agronomic traits, seed quality and superior wilt (Fusarium oxysporum Schlecht. f. sp. lini (Bolley) Snyder & Hansen) resistance should make this cultivar useful for producers and the flax industry.

Growth of Clumped vs. Equally Spaced Trees

1982 ◽  
Vol 58 (1) ◽  
pp. 23-25 ◽  
Author(s):  
W. M. Stiell
Keyword(s):  
Basal Area ◽  
Pinus Resinosa ◽  
Red Pine ◽  
Form Class ◽  
Significant Tendency ◽  
Made In ◽  
Crown Size

Fifteen-year results are presented for a thinning experiment made in 13-year-old red pine (Pinus resinosa Ait.), designed to compare growth of trees in 4-tree clumps with that of uniformly spaced trees, in both cases growing at 890 stems/ha. By the end of the period, average crown size, form class and height were about the same for both stands, but growth by trees in clumps had been less for dbh and for basal area and total volume per hectare. Clumped trees had a significant tendency to lean away from each other. It was concluded that control of inter-tree spacing at planting or thinning is justified to the extent that clumps of more than three adjacent trees be avoided.

scholarly journals UAV AND GIS BASED TOOL FOR COLLECTION AND PROPAGATION OF SEEDS MATERIAL – FIRST RESULTS

2016 ◽  
Vol XLI-B8 ◽  
pp. 663-667 ◽  
Author(s):  
K. Stereńczak ◽  
P. Mroczek ◽  
S. Jastrzębowski ◽  
G. Krok ◽  
M. Lisańczuk ◽  
...  
Keyword(s):  
Seed Quality ◽  
The State ◽  
Annual Reports ◽  
Estimation Methods ◽  
Selection Strategy ◽  
Seed Crop ◽  
Forest Reproductive Material ◽  
First Results ◽  
Reproductive Material ◽  
Seed Management

Seed management carried out by The State Forests National Forest Holding is an integral part of rational forest management. Seed collection takes place mainly from stands belonging to first category of forest reproductive material, which is the largest seed base in Poland. In smaller amount, seeds are collected in selective objects of highest forest reproductive material category (selected seed stands, seed orchards). The previous estimation methods of seed crop were based on visual assessment of cones in the stands for their harvest. Following the rules of FRM transfer is additional difficulty of rational seed management which limits the possibility of the use of planting material in Poland. <br><br> Statements concerning forecast of seed crop and monitoring of seed quality is based on annual reports from the State Forest Service. Forest Research Institute is responsible for preparing and publishing above-mentioned statements. A small extent of its automatization and optimization is a large disadvantage of this procedure. In order to make this process more effective web-based GIS application was designed. Its main performance will give a possibility to upload present-day information on seed efficiency, their spatial pattern and availability. Currently this system is under preparation. <br><br> As a result, the project team will get a possibility to increase participation of seed material collected from selected seed base and to share good practices on this issue in more efficient way. In the future this will make it possible to obtain greater genetic gain of selection strategy. <br><br> Additionally, first results presented in literature showed possible use of unmanned aerial system/vehicle (UAS/V) for supporting of seed crop forecast procedure.

How Significant is the Use/Mention Distinction?

2019 ◽  
pp. 11-16
Author(s):  
A.W. Moore
Keyword(s):  
Philosophy Of Language ◽  
Final Section ◽  
Clear Cut ◽  
The World ◽  
Cast Doubt ◽  
Made In

It is argued that the use/mention distinction, if it is to be a clear-cut one, cannot have the significance that it is usually thought to have. For that significance attaches to the distinction between employing an expression in order to draw attention to, or to talk about, some aspect of the world, as determined by the expression’s meaning, and employing it in order to draw attention to, or to talk about, the expression itself—and this distinction is not a clear-cut one. In the final section of the essay this argument is extended to cast doubt on a rather glib appeal to the use/mention distinction that is frequently made in the philosophy of language.

Techniques and key issues in collecting crop wild relatives

2021 ◽  
pp. 155-184
Author(s):  
Michael Way ◽  
Keyword(s):  
Genetic Diversity ◽  
Best Practice ◽  
Seed Quality ◽  
Crop Wild Relatives ◽  
Wild Relatives ◽  
Wild Plant ◽  
Genetic Sampling ◽  
Key Issues ◽  
Essential Resource ◽  
Seed Collections

The genetic diversity found in populations of crop wild relatives is an essential resource for future crop breeding, but populations are at risk of loss before germplasm has been fully conserved in genebanks. This chapter describes best practice for targeting and identifying species, and review knowledge about the variation in wild plant populations to guide the timing of collecting and approaches for genetic sampling. Indicators are presented for seed quality, ripeness and dispersal. Techniques for collection of seed, herbarium vouchers and associated data are reviewed with examples drawn from the Adapting Agriculture to Climate Change (Crop Wild Relative) project. Further research is needed to find optimal approaches for handling of seed to ensure high longevity of seed collections, and improved tools are needed to guide sampling of genetic diversity of crop wild relatives.

Usefulness of Caerulein in the Treatment of Post-Operative Intestinal Atony

1980 ◽  
Vol 8 (1) ◽  
pp. 98-104 ◽  
Author(s):  
V Ferreira Montero ◽  
A Martinez Laganga ◽  
E Aznar Garcia
Keyword(s):  
Control Group ◽  
Controlled Clinical Trial ◽  
Test Drug ◽  
Untreated Control Group ◽  
Clear Cut ◽  
Test Product ◽  
Post Operative Period ◽  
Intravenous Drip ◽  
Intestinal Peristalsis ◽  
Made In

We conducted a controlled clinical trial designed “to test caerulein for tolerability and effectiveness in post-operative patients recovering from abdominal surgery. The test product was administered 24 hours after surgery, by intravenous drip infusion, at the rate of 2 nanograms/kg/minute. The results were compared with parallel observations made in a matched group of patients receiving no drugs or manipulation likely to promote intestinal peristalsis with the exception of the application of a nasogastric tube for aspiration and the water and electrolyte replenishment customary in the post-operative period. The results of this study evince a clear-cut difference between the two groups of patients in regard to the restoration of intestinal peristalsis and the passing of flatus and faeces, as confirmed by statistical analysis (Cochran's test) demonstrating the significant (p<0.01) superiority of caerulein treatment relative to the untreated control group. Likewise, the study revealed the excellent tolerability of the test drug at the dosage employed.

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