Factors affecting the loss of yield of sugar beet caused by beet yellows virus. II. Nutrition and variety

1947 ◽  
Vol 37 (4) ◽  
pp. 301-310 ◽  
Author(s):  
R. Hull ◽  
Marion Watson
Keyword(s):  
Sugar Beet ◽  
Farmyard Manure ◽  
Economic Importance ◽  
Factors Affecting ◽  
Positive Effects ◽  
Rate Of Spread ◽  
Beet Yellows Virus ◽  
Negative Effect ◽  
The Mean ◽  
Spread Of Infection

The effect of beet yellows virus on the yield of sugar beet was tested in the presence and absence of various fertilizers and farmyard manure. In general the manorial treatments increased the root and sugar yields of both infected and healthy plants, but the losses caused by infection increased proportionally as the mean yields increased. When the effects of nitrogen, farmyard manure and salt on mean yield were large, the losses caused by infection were increased more than proportionally.The fertilizers had little effect in varying the symptoms of the disease. There was some indication that the red colour associated with some varieties of sugar beet was intensified by deficiency of phosphate and potash.The effect of fertilizers on rate of spread of infection was variable, and again appeared to depend largely upon the magnitude of the fertilizer effects on mean yield. Nitrogen, phosphate and potash occasionally had positive effects, and salt had a fairly consistent negative effect. None of the effects appeared to be of any economic importance.

Factors affecting the loss of yield of sugar beet caused by beet yellows virus: I. Rate and date of infection; date of sowing and harvesting

1946 ◽  
Vol 36 (3) ◽  
pp. 151-166 ◽  
Author(s):  
Marion A. Watson ◽  
D. J. Watson ◽  
R. Hull
Keyword(s):  
Sugar Beet ◽  
Field Experiments ◽  
Control Measures ◽  
Regression Coefficients ◽  
Factors Affecting ◽  
Beet Yellows Virus ◽  
Experimental Treatments ◽  
Spread Of Infection

Field experiments were carried out to measure the effect on the yield and composition of sugar beet of infection with beet yellows virus, and to determine how the effect varies with rate and date of infection and with date of sowing and harvesting of the crop.Control measures designed to prevent spread of infection within experimentally infected plots and introduction of infection from sources outside the experiment, were not completely effective. Consequently the numbers of plants which became infected differed from those prescribed by the experimental treatments. The effects of infection were, therefore, estimated by means of regressions on the numbers of plants observed to become infected on successive dates.After correcting the observed yields for accidental infections by means of the regression coefficients, it was found that the effect of infection on the yield of sugar was linearly related to the rate of infection, i.e. the loss of yield of sugar caused by infection was proportional to the percentage of infected plants. There was no compensation for loss in infected plants by increased growth of healthy neighbours.The effect of infection on yield of sugar decreased linearly with later date of infection, falling to values not significantly different from zero at the date of harvest. The loss of yield caused by infection was therefore approximately proportional to the interval of time between the date of infection, as shown by the appearance of symptoms, and the date of harvest.

Factors Affecting International Tourists’ Perceived Service Quality and Return Intention—A Study in Ho Chi Minh City, Vietnam

2016 ◽  
Vol 8 (3) ◽  
pp. 133
Author(s):  
Mai Ngoc Khuong ◽  
Nguyen Phuong Quyen
Keyword(s):  
Service Quality ◽  
Destination Image ◽  
Ho Chi Minh City ◽  
Factors Affecting ◽  
Perceived Service Quality ◽  
Positive Effects ◽  
Culture History ◽  
Perceived Price ◽  
Negative Effect ◽  
Return Intention

<p>This research aimed to measure key factors affecting international tourists’ perceived service quality and their return intention towards Ho Chi Minh City, Vietnam. A quantitative method was used with structured questionnaire directly delivered to 1,673 tourists who had already visited or stayed in the city for more than three days. The empirical results of this study showed that recreation and entertainment had the strongest effect; other factors such as perceived service quality, culture, history and art, safety and security, local cuisine, negative attributes, perceived price, natural environment, and destination image also had positive effects on international tourists’ return intention. Conversely, infrastructure provided negative effect on tourists’ return intention.</p>

scholarly journals Factors affecting capital structure of businesses in real estate sector on stock exchange

Accounting ◽  
2021 ◽  
Vol 7 (6) ◽  
pp. 1305-1314 ◽  
Author(s):  
Nguyen Ho Phi Ha ◽  
Mai Thanh Tu
Keyword(s):  
Real Estate ◽  
Capital Structure ◽  
Stock Exchange ◽  
Estimation Method ◽  
Tax Rate ◽  
Factors Affecting ◽  
The Real Estate ◽  
Positive Effects ◽  
Business Executives ◽  
Negative Effect

Based on the financial statements of real estate companies listed on Vietnamese stock market, the study has been conducted on factors affecting capital structure. The paper uses GLS (generalized least squared) estimation method related to panel data as well as testing to select the most appropriate model. Research results show that profitable real estate businesses, the ratio of fixed assets to total assets and the number of years of operation have a negative effect on capital structure. In contrast, renewable energy, size and growth are three factors that have positive effects on capital structure. In addition, the corporate income tax rate does not affect the capital structure decisions of real estate businesses. Through research, recommendations for the real estate business executives have been proposed to build an effective capital structure.

scholarly journals Evaluation of Factors Affecting Colostrum Quality and Quantity in Holstein Dairy Cattle

Animals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 2005
Author(s):  
Aikaterini Soufleri ◽  
Georgios Banos ◽  
Nikolaos Panousis ◽  
Dimitrios Fletouris ◽  
Georgios Arsenos ◽  
...  
Keyword(s):  
Large Scale ◽  
Linear Models ◽  
Fat Content ◽  
Time Interval ◽  
Factors Affecting ◽  
Significant Negative Effect ◽  
Energy Needs ◽  
Negative Effect ◽  
The Mean ◽  
Positive Effect

The objective of this study was to conduct a large-scale investigation of colostrum composition and yield and an evaluation of factors affecting them. In this study, 1017 clinically healthy Holstein cows from 10 farms were used. The colostrum TS were measured using a digital Brix refractometer. Fat, protein and lactose content were determined using an infrared Milk Analyzer. Statistical analysis was conducted using a series of univariate general linear models. The mean (±SD) percentage of colostrum fat, protein, lactose and TS content were 6.37 (3.33), 17.83 (3.97), 2.15 (0.73) and 25.80 (4.68), respectively. Parity had a significant positive effect on the protein and TS content and a negative one on fat content. The time interval between calving and colostrum collection had a significant negative effect on the fat, protein and TS contents and a positive one on lactose. Colostrum yield had a significant negative effect on the protein and TS content, and it was affected by all factors considered. In addition to TS, the evaluation of the colostrum fat content appears essential when neonates’ energy needs are considered. The Brix refractometer, an inexpensive and easy to use devise, can be used effectively in colostrum quality monitoring.

DIESEL ENGINE OPERATION IN USE OF FUEL WITH ADDITIVES

2018 ◽  
pp. 18-24
Author(s):  
Petar Kazakov ◽  
Atanas Iliev ◽  
Emil Marinov
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Diesel Fuel ◽  
Internal Combustion Engines ◽  
Experimental Studies ◽  
Combustion Engines ◽  
Engine Operation ◽  
Factors Affecting ◽  
Operating Modes ◽  
Positive Effects

Over the decades, more attention has been paid to emissions from the means of transport and the use of different fuels and combustion fuels for the operation of internal combustion engines than on fuel consumption. This, in turn, enables research into products that are said to reduce fuel consumption. The report summarizes four studies of fuel-related innovation products. The studies covered by this report are conducted with diesel fuel and usually contain diesel fuel and three additives for it. Manufacturers of additives are based on already existing studies showing a 10-30% reduction in fuel consumption. Comparative experimental studies related to the use of commercially available diesel fuel with and without the use of additives have been performed in laboratory conditions. The studies were carried out on a stationary diesel engine СМД-17КН equipped with brake КИ1368В. Repeated results were recorded, but they did not confirm the significant positive effect of additives on specific fuel consumption. In some cases, the factors affecting errors in this type of research on the effectiveness of fuel additives for commercial purposes are considered. The reasons for the positive effects of such use of additives in certain engine operating modes are also clarified.

Kinetic and thermodynamic study of the adsorption of calcium onto sugar beet pulp

2016 ◽  
pp. 565-570
Author(s):  
Huang Qin ◽  
Zhu Si-ming ◽  
Zeng Di ◽  
Yu Shu-juan
Keyword(s):  
Sugar Beet ◽  
Adsorption Equilibrium ◽  
Ph Value ◽  
Hard Water ◽  
Sugar Beet Pulp ◽  
Order Kinetic ◽  
Factors Affecting ◽  
Isotherm Equation ◽  
Equilibrium Data ◽  
Beet Pulp

Sugar beet pulp (SBP) was used as low value adsorbent for the removal of calcium from hard water. Batch experiments were conducted to determine the factors affecting adsorption of the process such as pH value and Ca concentration. The adsorption equilibrium of Ca2+ by the SBP is reached after 100min and a pseudo second-order kinetic model can describe the adsorption process. The initial concentrations of Ca varied from 927 to 1127mgCa2+/L. A dose of 30g/L sugar beet pulp was sufficient for the optimum removal of calcium. The overall uptake of Ca ions by sugar beet pulp has its maximum at pH=8. The adsorption equilibrium data fitted well with the Langmuir adsorption isotherm equation.

scholarly journals Factors Affecting Teaching English as a Second Language (TESL) Postgraduate Students’ Behavioural Intention for Online Learning during the COVID-19 Pandemic

2021 ◽  
Vol 13 (6) ◽  
pp. 3524
Author(s):  
Melor Md Yunus ◽  
Wee Shin Ang ◽  
Harwati Hashim
Keyword(s):  
Online Learning ◽  
Survey Design ◽  
Behavioural Intention ◽  
Intention To Use ◽  
Postgraduate Students ◽  
Factors Affecting ◽  
Positive Effects ◽  
Performance Expectancy ◽  
Use Of Technology ◽  
Facilitating Conditions

Online learning has become essential in education as the spread of coronavirus 19 (COVID-19) pandemic has brought significant changes to the field. However, education should remain welcoming and supportive to all the learners as it is important to keep the students’ behavioural intention in any form of learning environment. Thus, this study is significant as online learning is leading the trend of education now. Past studies revealed that the factors of performance expectancy, effort expectancy, social influence, and facilitating conditions under the unified theory of acceptance and use of technology (UTAUT) model affect learners’ behavioural intention to use online learning. This study intended to identify the most significant factors that influence TESL postgraduate students’ behavioural intention towards the use of online learning during the COVID-19 pandemic. It also examined the relationship amongst the four factors and postgraduate students’ behavioural intention to use online learning. The participants consisted of 169 postgraduate students at a public university in Malaysia. To achieve the aim, the study utilized a survey design using a questionnaire. The results from regression analysis revealed that all of the factors have positive effects on postgraduate students’ behavioural intention to use online learning. Meanwhile, performance expectancy has the greatest influence on postgraduate students’ behavioural intention. Hence, this study concludes that the practicality and the usefulness of online learning should be highlighted by the authorities.

scholarly journals Spatial distribution of the Barbary Partridge (Alectoris barbara) in Sardinia explained by land use and climate

2021 ◽  
Vol 67 (4) ◽  
Author(s):  
Gianpasquale Chiatante ◽  
Marta Giordano ◽  
Anna Vidus Rosin ◽  
Oreste Sacchi ◽  
Alberto Meriggi
Keyword(s):  
Land Use ◽  
Conservation Status ◽  
Distance Sampling ◽  
Strong Relationship ◽  
European Population ◽  
Factors Affecting ◽  
Brood Rearing ◽  
Management Actions ◽  
Negative Effect ◽  
Study Sites

AbstractMore than half of the European population of the Barbary Partridge is in Sardinia; nonetheless, the researches concerning this species are very scarce, and its conservation status is not defined because of a deficiency of data. This research aimed to analyse the habitat selection and the factors affecting the abundance and the density of the Barbary Partridge in Sardinia. We used the data collected over 8 years (between 2004 and 2013) by spring call counts in 67 study sites spread on the whole island. We used GLMM to define the relationships between the environment (topography, land use, climate) both the occurrence and the abundance of the species. Moreover, we estimated population densities by distance sampling. The Barbary Partridge occurred in areas at low altitude with garrigue and pastures, avoiding woodlands and sparsely vegetated areas. We found a strong relationship between the occurrence probability and the climate, in particular, a positive relation with temperature and a negative effect of precipitation, especially in April–May, during brood rearing. Furthermore, dry crops positively affected the abundance of the species. We estimated a density of 14.1 partridges per km2, similar to other known estimates. Our findings are important both because they increase the knowledge concerning this species, which is considered data deficient in Italy, and because they are useful to plan management actions aimed to maintain viable populations if necessary.

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