scholarly journals THE NUTRITIVE EVALUATION OF COCKSFOOT PASTURE UNDER DIFFERENT LEVELS OF NITROGEN FERTILIZATION

1970 ◽  
pp. 87-97
Author(s):  
R.L. Reid ◽  
Amy J. Post ◽  
G.A. Jung
Keyword(s):  
Nitrogen Fertilization ◽  
Grass Species ◽  
Growth Stages ◽  
Eastern United States ◽  
The North ◽  
Nutritive Quality ◽  
North Eastern ◽  
Feeding Trials ◽  
And Storage

DURING the past few years, increasing emphasis has been placed on the use of nitrogen fertilized grass species, rather than grass-legume mixtures, in the North-eastern United States. According to Washko et al. (1967)) factors contributing to this trend have been the spread of the alfalfa weevil, development of improved, high yielding grass varieties, the availability of nitrogen fertilizer at economical prices, better harvesting and storage techniques, and the demonstration that grasses fertilized adequately and cut early are equivalent to legumes in nutritive quality. Of the different grass species examined, cocksfoot (Dactylis glomerata) has been shown to respond well to nitrogen fertilization, to be highly competitive, and to recover well under severe cutting managements. It has been claimed that cocksfoot is inferior nutritionally to other grasses. This was not substantiated in sheep feeding trials with herbage cut at different growth stages (Reid et al., 1962; Reid and Jung, 1965, or in subsequent grazing trials (Reid, Jung and Kinsey, 1967).

scholarly journals Les mines de fer de Schefferville

2005 ◽  
Vol 2 (3) ◽  
pp. 37-61 ◽  
Author(s):  
André Journaux ◽  
François Taillefer
Keyword(s):  
Iron Ore ◽  
Great Distance ◽  
Ore Deposits ◽  
Taiga Zone ◽  
Eastern United States ◽  
The North ◽  
Iron Smelting ◽  
North Eastern ◽  
Percentage Yield

The iron mines of Schefferville, at a latitude of 55° N., are the first mines exploited in one of the best provided iron ore regions in the World ; the geosynclinal of Labrador. Their distance from the sea (360 miles to the estuary of the St. Lawrence) is compensated for by the richness of the ore deposits : abundant reserves, high percentage yield, and the quality of the mineral. The ore is mined in open pits ; the main difficulty is the harshness of the climate, which necessitates the interruption of operations from the end of November to the middle of April. The deposits are found in a subarctic taiga zone. It has been necessary to bring in all the workers ; mostly French Canadians, but also some foreigners. All tools and provisions have to be transported a great distance. The ore production is increasing rapidly : 2.25 million tons in 1954, 6 million tons in 1955, and 12 million tons in 1956. It will reach 20 million tons within the next few years. The ore is transported entirely by the railroad specially built to the port of Sept-Iles, from which it reaches, either by the sea route or by the St. Lawrence, the iron-smelting region of the north-eastern United States, where the principal outlets of the Iron Ore Co. of Canada are found. The port of Sept-Iles, which had a population of 5,573 in 1956, compared to that of 1,866 in 1951, could very possibly see its importance increase when the completion of the St. Lawrence Seaway will allow prairies grain, and possibly Pennsylvania coal, to serve as return freight for the iron ore. Close to the mines, Schefferville already has 3,500 inhabitants and has become the largest town in Labrador. Besides its purely mining junctions there are others, in particular that of a supply centre and of a transportation terminus. Its population is becoming progressively more stable and of a more balanced composition. The camp of the first prospectors is thus transformed into a permanently populated centre, of which the legal existence was recognized on the first of August, 1955.

Effects of 2017 Early Flash Flooding on Agriculture in Haor Areas of Sunamganj

2021 ◽  
Vol 12 (1-2) ◽  
pp. 117-125
Author(s):  
S Mondal ◽  
L Akter ◽  
HJ Hiya ◽  
MA Farukh
Keyword(s):  
Agricultural Production ◽  
Flash Flood ◽  
Eastern Region ◽  
Fish Production ◽  
Flood Events ◽  
Flash Flooding ◽  
The North ◽  
North Eastern ◽  
Boro Rice

The Sunamganj district is covered by major Haor systems in the north-eastern region of Bangladesh. Flash flood is the most commonly occurring water related disaster in the Haor areas. During the flash flood it is very common that people lost their primary agricultural productions which are the only source of their livelihood. The present study focuses on the effects of 2017 early flash flooding on rice and fish production of Sunamganj Haor areas. The flood caused enormous damage to agriculture such as rice especially Boro rice and fish production on which the Haor dwellers rely upon for their livelihood. The total affected land of Boro rice cultivation in Haors of Sunamganj was 149,224 hectare and the total amount of damaged rice was 393,855 metric ton (MT). The total number of affected farmers was 315,084. The early flash flood also affects the quality of Haor water which caused the death of fishes. The total amount of damaged fish was 49.75 MT and the loss was 158.70 lakh taka. The total number of affected fishermen was 44,445. This findings could be very useful for the environmental scientists to predict the probable future effects on agricultural production due to early flash flood events in Sunamganj Haors areas. Environ. Sci. & Natural Resources, 12(1&2): 117-125, 2019

A Sibling Species Group of Hydractinia in the North-Eastern United States

1989 ◽  
Vol 69 (4) ◽  
pp. 857-874 ◽  
Author(s):  
Leo W. Buss ◽  
Philip O. Yund
Keyword(s):  
United States ◽  
Sibling Species ◽  
Host Species ◽  
Larval Dispersal ◽  
Phylogenetic Reconstruction ◽  
Species Group ◽  
Eastern United States ◽  
The North ◽  
North Eastern ◽  
Symbiotic Organisms

Many symbiotic organisms are narrowly distributed on one or a few host species. These associations are intriguing, as they invite the development of hypotheses regarding the pattern and process of speciation and serve as laboratories for the testing of methods of phylogenetic reconstruction (Kraus, 1978; Futuyma & Slatkin, 1983; Stone & Hawks worth, 1986). The evolution of host-specificity in the sea may be expected to be severely constrained by the difficulty of achieving reproductive isolation in taxa whose gametes are freely released into the water column and/or whose larvae are potentially widely distributed (Scheltema, 1977). Yet this difficulty may well be overestimated, given the recent demonstrations of limited gamete (Pennington, 1985; Yund, in press) and larval dispersal (Knight-Jones & Moyse, 1961; Ryland, 1981; Olsen, 1985; Jackson & Coates, 1986; Grosberg, 1987). Indeed, if gamete and larval dispersal are as limited as has recently been contended (Jackson, 1986), local isolation of populations may be a routine occurence, offering repeated opportunities for speciation.

scholarly journals The recent development of melanism in the larvæ of certain species of Lepidoptera, with an account of its inheritance in Selenia bilunaria esp

1932 ◽  
Vol 111 (770) ◽  
pp. 188-200 ◽  
Keyword(s):  
United States ◽  
Central Europe ◽  
The United States ◽  
Eastern United States ◽  
Evolutionary Processes ◽  
Number Of Species ◽  
The North ◽  
North Eastern ◽  
Geometrid Moth ◽  
State Of Affairs

One of the most remarkable evolutionary processes, the more striking since it has occured before our eyes, has been the rise and spread of melanism and melanochroism amongst the Lepidopetera. Commencing about 1850 in the Manchester area in England with the Geometrid moth Amphidasys betularia L., which yielded the black form carbonaria Jord. ( doubledayaria Mill.), this development has proceeded so rapidly, and become so widespread, that now there is scarcely a country in Northern and Central Europe which does not produce its quota of melanic insects. Moreover, the same state of affairs exists in the North-Eastern United States, although there the number of species affected, up to the present, is not so great as in Europe. Another important feature about these changes lies in the circumstance that, almost uniformly, in Europe and in the United States, the first species to exhibit melanism in any given area have been Amphidasys betularia and Tephrosia crepuscularia . From the beginning, the Geometridæ, more especially the subfamily Boarmiinæ, have provided not only the bulk of the melanic varieties, but also the greatest numbers of individuals. In many areas, as for example in the case of A. betularia and Y psipetes trifasciata , only black examples occur. Nevertheless, other groups include species which have gone black; for instance, the Noctuidæ present black forms of Aplecta nebulosa Hufn., the Cymatophoridæ of Cymatophora or F., the Arctiidæ of Spilosoma lubricipeda L., the Gelechiidæ of Chimabacche fagella F., and so on.

scholarly journals Roseovarius crassostreae sp. nov., a member of the Roseobacter clade and the apparent cause of juvenile oyster disease (JOD) in cultured Eastern oysters

2005 ◽  
Vol 55 (4) ◽  
pp. 1531-1537 ◽  
Author(s):  
Katherine J. Boettcher ◽  
Kara K. Geaghan ◽  
Aaron P. Maloy ◽  
Bruce J. Barber
Keyword(s):  
New York ◽  
Phylogenetic Analyses ◽  
Bootstrap Support ◽  
Rrna Gene ◽  
Eastern United States ◽  
Whole Cells ◽  
The North ◽  
Principal Fatty Acid ◽  
North Eastern ◽  
Juvenile Oyster Disease

An α-proteobacterium has been identified which is believed to be the causative agent of juvenile oyster disease (JOD). Since its first isolation in 1997, the bacterium has been recovered as the numerically dominant species from JOD-affected animals throughout the north-eastern United States (Maine, New York and Massachusetts). Colonies are usually beige to pinkish-beige, although the majority of isolates recovered in 2003 from an epizootic in Martha's Vineyard, Massachusetts, produce colonies with a greenish-yellow appearance. The cells are Gram-negative, aerobic, strictly marine and rod or ovoid in appearance. They are actively motile by one or two flagella, but cells are also observed to produce tufts of polar fimbriae. The principal fatty acid in whole cells is C18 : 1 ω7c and other characteristic fatty acids are C16 : 0, C10 : 0 3-OH, 11-methyl C18 : 1 ω7c and C18 : 0. Almost without exception, isolates have 16S rRNA gene sequences that are 100 % identical to each other. Phylogenetic analyses place the organism within the Roseobacter clade of the α-Proteobacteria, with moderate bootstrap support for inclusion in the genus Roseovarius. DNA–DNA relatedness values from pairwise comparisons of this organism with the type species of the genus (Roseovarius tolerans) and the only other described species in this genus, Roseovarius nubinhibens, were 11 and 47 %, respectively. Phenotypic and biochemical dissimilarities also support the assignment of this bacterium to a novel species. The name Roseovarius crassostreae sp. nov. is proposed, with the type strain CV919-312T (=ATCC BAA-1102T=DSM 16950T).

Sign in / Sign up

Export Citation Format

Share Document