Growth and Development of Bulbous Oatgrass (Arrhenatherum elatiusvar.bulbosum)

1990 ◽  
Vol 4 (4) ◽  
pp. 843-848 ◽  
Author(s):  
Karin Tanphiphat ◽  
Arnold P. Appleby
Keyword(s):  
United States ◽  
Growth Rate ◽  
Growth And Development ◽  
Perennial Grass ◽  
The United States ◽  
Willamette Valley ◽  
Stem Base ◽  
Absolute Growth Rate ◽  
Early Autumn ◽  
Absolute Growth

Bulbous oatgrass, a weed in parts of the United States and Europe, is an unusual grass, which forms corms at the stem base. Growth and development of this creeping perennial grass was investigated in the field and in pots outdoors. Under the mild climate of the Willamette Valley, Oregon, shoots emerged in early autumn. Plants grew vegetatively and formed corms during the winter and spring. Aboveground portions of the plant stopped growing and senesced in the summer. The absolute growth rate of the plants was highest in early May, shortly before the onset of flowering. In early May, the growth rate of corms was higher than that of the shoot.

A comparative study on the nursery culture of hatchery-reared sub-adult cupped oyster, Crassostrea iredalei (Faustino, 1932), in an earthen pond and a mangrove canal

2018 ◽  
Vol 26 (4) ◽  
pp. 217-222
Author(s):  
Premwadee Chueachat ◽  
Woraporn Tarangkoon ◽  
Suwat Tanyaros
Keyword(s):  
Growth Rate ◽  
Comparative Study ◽  
Condition Index ◽  
Daily Growth ◽  
Nursery Culture ◽  
Absolute Growth Rate ◽  
Significant Difference ◽  
Adult Oyster ◽  
Absolute Growth ◽  
The Mean

Abstract A comparative study on the nursery culture of the spat of the tropical oyster, Crassostrea iredalei, in an earthen pond and a mangrove canal was conducted over two months. The results revealed no differences in the absolute growth rate determined by shell width between the two culture sites (P < 0.05). Sub-adult oysters cultured in the mangrove canal showed a higher absolute growth rate in shell length and a higher daily growth rate than the oysters cultured in the earthen pond (P < 0.05). The mean survival rate of sub-adult oysters cultured in the earthen pond (99.8 ± 0.2%) was significantly higher than for those cultured in the mangrove canal (66.7 ± 31.4%). Decreased density from the loss of sub-adult oyster nursery culture in the mangrove canal led to higher growth performance than in the earthen pond. However, no difference was found for the fraction of oysters larger or smaller than 5 cm for the two culture sites (P < 0.05). A significant difference was noted in the Condition Index (CI) between the two culture sites (P < 0.05). The high primary productivity in mangroves is a major supporter of higher CI in sub-adult oysters cultured in mangrove canals versus in earthen ponds. Water exchange in the earthen pond to maintain calcium and magnesium concentrations resulted in no differences in the shell compressibility of sub-adult oysters compared with those cultured in the mangrove canal.

scholarly journals ECONOMIC ENVIRONMENT OF ARCTIC LIQUEFIED NATURAL GAS SUPPLIESTO THE ASIAN-PACIFIC REGION COUNTRIES UNDER THE END OF THE “TRADE WAR” BETWEEN THE USA AND CHINA

2020 ◽  
Vol 68 (2/2020) ◽  
pp. 12-21
Author(s):  
M. V. Ulchenko ◽  
Keyword(s):  
United States ◽  
Growth Rate ◽  
Natural Gas ◽  
South Korea ◽  
The United States ◽  
Liquefied Natural Gas ◽  
Asia Pacific ◽  
Russian Arctic ◽  
Pacific Region ◽  
Asia Pacific Region

Currently, the Asia-Pacific market is a priority goal for almost all major producers of liquefied natural gas(LNG). This is due to the relatively high price that local consumers are willing to pay, as well as the accelerated growth rate of natural gas consumption. At the same time, China is the main driver of growth in demand for LNGin the world, has concluded a trade agreement with the United States, which involves the purchase of energy resources worth more than $ 52 billion over two years. Given the decline in LNG prices, as well as increased competition, the issue of the prospects for sales of Russian Arctic gas on the market of the Asia-Pacific region becomes particularly relevant.The study provides a generalized assessment of the needs of the main importers of LNG ––China, South Korea and Japan, with a planning horizon of 4–5 years. The relatively high growth rates of the economy, partial rejection of nuclear energy, struggle to improve the environmental situation, as well as the desire to diversify supply routes explain the needs of the countries in the Asia-Pacific region for additional volumes of LNGin the near future. The analysis showed that both Japan and South Korea are interested in increasing the volume of imports of Russian arctic LNG, whose key advantages over most competitors are the price and relative proximity of sales markets. At the same time, the reduction in the number of operating gas drilling rigs in the United States indicates that it will not be possible to maintain the growth rate of LNG production at the level of 2018 and 2019.

scholarly journals Soil preparation and NPK fertilization in the planting of five Atlantic Rainforest species in a clay extraction area

2020 ◽  
Vol 42 ◽  
pp. e36
Author(s):  
Ana Paula Braido Pinheiro ◽  
Adriele Dos Santos Jardim ◽  
João Vitor Garcia Silva ◽  
Adriano Alves Fernandes ◽  
Fábio Ribeiro Pires ◽  
...  
Keyword(s):  
Growth Rate ◽  
Experimental Design ◽  
Native Species ◽  
Atlantic Rainforest ◽  
Extraction Area ◽  
Absolute Growth Rate ◽  
Absolute Growth ◽  
Soil Preparation ◽  
Number Of Leaves ◽  
Npk Fertilization

The occurrence of degraded areas worldwide grows each year and measures must be taken to mitigate degradation and to recover these areas. The aim of this study was to assess the effect of soil preparation and NPK levels on the growth of five native species of the Atlantic Rainforest in clay extraction area. The experimental design was randomized block in a split-split plot arrangement with four replications. Subsoiling and scarification soil preparation represented main plots.  Doses of NPK 04-14-08: 0; 40; 80;160; and 320 g pit-1 represented subplots and Atlantic Rainforest native species represented sub-subplots. Absolute growth rate, stem diameter and number of leaves were evaluated, 210 days after planting. The type of soil preparation did not influence the development of the species. The best dose for Dalbergia ecastaphyllum, Inga laurina, Protium heptaphyllum and Psidium cattleyanum were 176.49, 150.18, 199.25 and 166.48 g pit-1 of NPK, respectively. Schinus terebinthifolius was highly responsive to planting fertilization, being recommended 320 g pit-1 of NPK. All species are indicated for area recovery.

Latitude and Relative Growth in the Razor Clam, Siliqua Patula

1931 ◽  
Vol 8 (3) ◽  
pp. 228-249
Author(s):  
F. W. WEYMOUTH ◽  
H. C. McMILLIN ◽  
WILLIS H. RICH
Keyword(s):  
Growth Rate ◽  
Life Span ◽  
Relative Growth Rate ◽  
Growth Data ◽  
Natural Conditions ◽  
Relative Growth ◽  
Absolute Growth Rate ◽  
Mathematical Expressions ◽  
Wide Range ◽  
Absolute Growth

1. The present paper is a study of the growth of a clam (Siliqua patula) under natural conditions and over a wide range of latitude. 2. Various constants derived from the growth data are compared for the different localities. For this species, over the range considered, growth in the southern localities as compared with the northern is initially more rapid but less sustained, leads to a smaller total length and is associated with a shorter life span. 3. Reasons are presented for considering the relative growth-rate as a particularly significant constant leading to more sound biological conclusions than the use of the absolute growth-rate. 4. On the basis of the relative growth-rate, current mathematical expressions for the course of growth are discussed and a formula used which emphasises Minot's conception of a growth-rate constantly declining with age. This expression L = Be-ce-ce-kt, in which L = length at time t, e = base of natural logarithms, and B, c and k are constants, is found to graduate the extensive data in clam growth with significant accuracy.

Scientometric Study of Poultry Industry Research Publications: A Global Perspective

2019 ◽  
Vol 9 (S1) ◽  
pp. 25-30
Author(s):  
Jisha Antony ◽  
S. Raja ◽  
P. Dhanya
Keyword(s):  
United States ◽  
Growth Rate ◽  
Publication Output ◽  
The United States ◽  
Global Perspective ◽  
United States Department ◽  
Annual Growth Rate ◽  
Poultry Industry ◽  
Prolific Author ◽  
Poultry Science

This study analysis ‘Publication output of Poultry industry’ in the Scopus database during the period 2008 to 2017. The analysis revealed that the total 4248 documents indexed in the database during the selected period of study. The highest productive year is 2017 with 610 publications (14.36%) and the lowest is 2008 with 268 publications (6.31%). 77.87% of publications are scholarly articles. The most prolific author is S.C. Ricke. With 25(0.59%) papers followed by K. Dhama with 22 (0.52 %/) papers. The most productive country is the United States with 1071 publications. The famous Journal in this field is ‘Poultry science’ with 255 publications (6%) and the journals ‘World S Poultry Science Journal’ with 115 publications (2.71%) and ‘Avian Diseases’ with 113 publications (2.66%) occupies the second and third ranks respectively. From the institutional output, the United States Department of Agriculture, Washington DC dominates the other institutions with the output of 138 articles (3.25%). The poultry industry is a multidisciplinary subject and it includes articles with different areas and the main subject areas are found to be Agricultural and Biological Sciences having 2168 documents followed by Immunology and Microbiology with 988 documents. This study also analysis Annual Growth Rate, Relative growth rate, doubling time.

E-books: In the shadow of print

2018 ◽  
Vol 26 (4) ◽  
pp. 895-911 ◽  
Author(s):  
Annika Bergström ◽  
Lars Höglund
Keyword(s):  
United States ◽  
Growth Rate ◽  
The United States ◽  
Displacement Function ◽  
Printed Books ◽  
Library Use ◽  
English Speaking ◽  
People’S Attitudes ◽  
Demographic Background ◽  
Language Areas

The e-book has gained a large number of readers in many countries. However, the growth rate, as well as the market penetration of e-books, varies considerably between countries and language areas. In the United States and other English-speaking countries, the use of e-books is more widespread than in many European countries, such as Sweden. In both the United States and Swedish markets, the growth rate has slowed down during the latest 2 years, and the majority of readers still seem to prefer printed books. This article aims to reveal the relationship between attitudes and use of e-books and to contextualize this in relation to socio-demographic background, library use and reading habits. The results, based on national, representative surveys in Sweden during 2013 and 2014, show that people’s attitudes are a significant and important factor for the choice of e-books instead of print, but this is probably a two-way relationship. It is also evident that e-books serve a complementary rather than displacement function in relation to print.

A NOTE ON THE IMPLICATIONS OF AUTOMATION FOR ECONOMIC GROWTH AND THE LABOR SHARE

2017 ◽  
Vol 23 (3) ◽  
pp. 1294-1301 ◽  
Author(s):  
Klaus Prettner
Keyword(s):  
United States ◽  
Economic Growth ◽  
Growth Rate ◽  
Population Growth ◽  
Capital Accumulation ◽  
Technological Progress ◽  
The United States ◽  
Economic Growth Rate ◽  
Labor Share ◽  
Long Run

We introduce automation into a standard model of capital accumulation and show that (i) there is the possibility of perpetual growth, even in the absence of technological progress; (ii) the long-run economic growth rate declines with population growth, which is consistent with the available empirical evidence; (iii) there is a unique share of savings diverted to automation that maximizes long-run growth; and (iv) automation explains around 14% of the observed decline of the labor share over the last decades in the United States.

scholarly journals Strong Social Distancing Measures In The United States Reduced The COVID-19 Growth Rate

2020 ◽  
Vol 39 (7) ◽  
pp. 1237-1246 ◽  
Author(s):  
Charles Courtemanche ◽  
Joseph Garuccio ◽  
Anh Le ◽  
Joshua Pinkston ◽  
Aaron Yelowitz
Keyword(s):  
United States ◽  
Growth Rate ◽  
The United States ◽  
Social Distancing

scholarly journals The Contribution of Chicken Products’ Export to Economic Growth: Evidence from China, the United States, and Brazil

2019 ◽  
Vol 11 (19) ◽  
pp. 5253 ◽  
Author(s):  
Xiaowei Wen ◽  
Lin Li ◽  
Sangluo Sun ◽  
Qinying He ◽  
Fu-Sheng Tsai
Keyword(s):  
United States ◽  
Economic Growth ◽  
Growth Rate ◽  
Agricultural Sector ◽  
The United States ◽  
Agricultural Export ◽  
Economic Growth Rate ◽  
Food And Agriculture ◽  
Food And Agriculture Organization ◽  
Equilibrium Relationship

As a core industry of the national economy, there is no doubt that the agricultural sector has to adapt to the new economic development. In the literature, many researchers have agreed that agricultural export is an important factor affecting economic growth. This paper explores the contribution of chicken products’ export to economic growth and the causal relationship between them. Based on the data from the Food and Agriculture Organization of the United Nations (FAO) and World Bank between 1980 and 2016, this paper describes and compares the characteristics of chicken products’ export trade of China, the United States, and Brazil. By applying the co-integration analysis, we find that there is no significant long-term equilibrium relationship between chicken products’ export and economic growth rate in China, the United States, or Brazil. However, the growth rate of chicken products’ export significantly promotes the economic growth rate for the United States. Besides, for both China and the United States, the direct pull degree (an estimator quantifying the degree of agricultural products’ exports in stimulating economic growth) of chicken products’ export is relatively small and less volatile. Yet, the direct pull degree of China is 14 times that of the United States, and the contribution to the economic growth rate of the United States is 8 times that of China. Both the direct pull degree and economic growth contribution of chicken products’ export of Brazil fluctuates more often, and its direct pull degree is 0.25 times that of China, and the economic contributions to the growth rate is 1.65 times that of China.

Sign in / Sign up

Export Citation Format

Share Document