scholarly journals Weather conditions during the blossoming period and their effect on the yield of three cultivars of blackcurrant (Ribes nigrum L.)

2009 ◽  
Vol 21 (2) ◽  
pp. 35-42
Author(s):  
Jan Grabowski ◽  
Zdzisław Kawecki ◽  
Anna Bieniek ◽  
Zofia Tomaszewska
Keyword(s):  
Statistical Analysis ◽  
Correlation Analysis ◽  
Air Temperature ◽  
Ground Level ◽  
Weather Conditions ◽  
Ribes Nigrum ◽  
Weather Factors ◽  
Total Rainfall ◽  
Linear Correlation Analysis ◽  
Variable Weather

Abstract This study presents the influence of major weather factors during the blackcurrant blossoming period on the yields of the ‘Ojebyn’, ‘Titania’ and ‘Roodknop’ cultivars, cultivated in Warmia (Olsztyn). The study was conducted for five years (2003-2007). Among the factors analysed were the currant yield, the duration of the blossoming period, average daily air temperature, the number of days with frost at the height of 2 m and at the ground level, total rainfall during the blossoming period and the number of days with rainfall during the blossoming period. The statistical analysis of particular weather factors has shown that the number of days with frost contributed significantly to the yield of the fruit. A linear correlation analysis has shown that the yield of the three examined cultivars of blackcurrant depended on variable weather conditions during the blossoming period. The yield of the ‘Ojebyn’ cultivar was significantly correlated with the duration of the blossoming period, the number of days with frost and the number of days with rainfall. A significant correlation in the ‘Titania’ cultivar was found with the number of days with frost and with the total amount of rainfall during the blossoming period. The fruit yield from the ‘Roodknop’ cultivar in the five-year period under study depended only on one variable: the duration of the blossoming period. The highest yield was obtained from the ‘Titania’ cultivar.

Weather factors affecting the development of maize from sowing to flowering

1972 ◽  
Vol 78 (2) ◽  
pp. 325-331 ◽  
Author(s):  
M. N. Hough
Keyword(s):  
Soil Moisture ◽  
Correlation Analysis ◽  
Linear Correlation ◽  
Weather Conditions ◽  
Weather Data ◽  
Weather Factors ◽  
Mean Values ◽  
Rate Of Development ◽  
Linear Correlation Analysis ◽  
The Mean

SUMMARYThe phenological development from sowing to flowering of the eaxly maize hybrid INRA 200 is related to the weather conditions. Plot trial data from Wytham, near Oxford, England, and weather information from that and nearby sites formed the basic data.The mean rate of development per day from sowing to emergence is related by linear correlation analysis to the mean values of soil temperature at 5 cm depth and soil moisture deficit. A range of temperature thresholds for emergence development exist, which depend upon the soil moisture, and which differ from the true physiological threshold.Between omergence and flowering the mean rate of development per day is related by linear correlation analysis to mean air temperature, solar radiation and potential transpiration estimated from weather data. All correlations are significant, but the parameters which combine radiation and temperature are statistically better.

scholarly journals The Vertical Stratification of Air Temperature in the Center of Athens

2010 ◽  
Vol 49 (6) ◽  
pp. 1219-1232 ◽  
Author(s):  
C. Georgakis ◽  
M. Santamouris ◽  
G. Kaisarlis
Keyword(s):  
Air Temperature ◽  
Open Space ◽  
Ground Level ◽  
Weather Conditions ◽  
Threshold Value ◽  
Critical Threshold ◽  
Aspect Ratios ◽  
Urban Geometry ◽  
Urban Rural ◽  
The Difference

Abstract The intraurban temperature variation in the center of Athens, Greece, was investigated in relation to urban geometry. This paper describes two main tasks: 1) Air temperature was recorded in the center of Athens and at the Meteorological Service Station at the University of Athens. Experimental data were collected through extensive monitoring at four different heights inside five different urban canyons in the center of Athens during the summer period. A measurement uncertainty analysis was carried out to estimate critical threshold values of air temperature below which differences were not significant. 2) The correlation between urban–suburban air temperature differences was assessed, using the geometrical characteristics of each urban street canyon. Urban–rural air temperature differences were considered to be not important if they were below the threshold value of 0.3°C. It was concluded that the major factor controlling urban–suburban air temperature differences was the geometry of the urban area. Other factors were the orientation of the observational sites, the current weather conditions, and the inversion of air masses adjacent to the ground level. An increase in the value of aspect ratios leads to a decrease in the difference between air inside the canyons and at the suburban station. The air temperature profile in an open-space area was the most important defining factor for the stratification of the urban–rural air temperature differences.

scholarly journals How is COVID-19 affected by weather? Meta-regression of 158 studies and recommendations for best practices in future research

2021 ◽  
Author(s):  
Ling Tan ◽  
David M. Schultz
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Best Practices ◽  
Air Temperature ◽  
Time Lag ◽  
Geographical Location ◽  
Weather Conditions ◽  
Future Research ◽  
Weather Variables ◽  
Meta Regression

AbstractBecause many viral respiratory diseases show seasonal cycles, weather conditions could affect the spread of COVID-19. Although many studies pursued this possible link early in the pandemic, their results were inconsistent. Here, we assembled 158 quantitative empirical studies examining the link between weather and COVID-19. A meta-regression analysis was performed on their 4,793 correlation coefficients to explain these inconsistent results. We found four principal findings. First, 80 of the 158 studies did not state the time lag between infection and reporting, rendering these studies ineffective in determining the weather–COVID-19 relationship. Second, the research outcomes depended on the statistical analysis methods employed in each study. Specifically, studies using correlation tests produced outcomes that were functions of the geographical locations of the data from the original studies, whereas studies using linear regression produced outcomes that were functions of the analyzed weather variables. Third, Asian countries had more positive associations for air temperature than other regions, possibly because the air temperature was undergoing its seasonal increase from winter to spring during the rapid outbreak of COVID-19 in these countries. Fourth, higher solar energy was associated with reduced COVID-19 spread, regardless of statistical analysis method and geographical location. These results help interpret the inconsistent results and motivate recommendations for best practices in future research. These recommendations include calculating the effects of a time lag between the weather and COVID-19, using regression analysis models, considering nonlinear effects, increasing the time period considered in the analysis to encompass more variety of weather conditions and to increase sample size, and eliminating multicollinearity between weather variables.

scholarly journals The influence of weather conditions on breeding dates of the common gull (Larus canus) in the south of Western Siberia

2021 ◽  
Vol 16 (3) ◽  
pp. 8-18
Author(s):  
M. Yu. Garyushkina ◽  
A. K. Yurlov
Keyword(s):  
Air Temperature ◽  
Large Scale ◽  
Climatic Factors ◽  
Weather Conditions ◽  
Egg Laying ◽  
Weather Variables ◽  
Weather Factors ◽  
Spring Temperatures ◽  
The Common ◽  
Using Data

Aim. The purpose of this research was to find out what local weather factors influence the nesting timing of the common gull (Larus canus). Material and Methods. The time of egg laying by the common gull was determined using data obtained during regular surveys over 8 years (1996‐1998, 2002‐2003, 2006‐2008) on the islands of Lake Bolshie Chany. Weather and climatic factors were assessed using open‐access databases. Results. It was been established that the start of egg‐laying in the colony of the common gull is determined by wind strength, the number of rainy days, the associated atmospheric pressure during the second decade of April, and the air temperature – the transition date at which the average daily air temperature rose above 0°C. In years with unstable spring temperatures, a relationship was revealed between the air temperature and the intensity of egg laying by the common gulls by day. In years when temperatures rise evenly, precipitation and wind speed become the main factors.Conclusion. We conclude that the egg‐laying dates of the common gull is influenced by weather variables during the whole nesting season and not predominantly by early season variables. We also show the importance of large‐scale climatic phenomena such as the EAWR in explaining variability in timing of the nesting of the common gull in Siberia. We suggest that future studies should focus on the effects of extremes in weather variables and global climatic phenomena.

Trends in the Phenology of Climber Roses under Changing Climate Conditions in Mazovia Lowland in Central Europe

2021 ◽  
Author(s):  
Marta Monder
Keyword(s):  
Central Europe ◽  
Air Temperature ◽  
Ornamental Plants ◽  
Ground Level ◽  
Weather Conditions ◽  
Frost Damage ◽  
Growth Conditions ◽  
Climatic Conditions ◽  
Climate Conditions ◽  
Urban Green Spaces

The genetic pool of valuable old ornamental cultivars and their in situ maintenance may be threated by climate change. Meanwhile, the ornamental plants like roses make up an important share of both gardens and urban green spaces, where they are particularly vulnerable to multistress growth conditions. The aim of this research was to evaluate the effect of changing climatic conditions on growth and flowering of 11 historic climber roses through long-term studies (2000-2017) conducted in Central Europe. The evaluation of plants consisted of assessment of frost damage and the timing of early phenological stages (starting of bud break, leaf unfolding) as well as gathering data on beginning, fullness and end of flowering and its abundance. Frost damage was not recorded in any year only in ‘Mme Plantier’, and did not occur for any cultivar after the winter in the years 2007, 2008, and 2014. Only a little damage to one-year shoots was recorded after the winter in the years 2015-2017. Frost damage to ‘Alberic Barbier’, ‘Albertine’, ‘Chaplin's Pink Climber’, ‘Orange Triumph clg’ and ‘Venusta Pendula’ led to pruning to ground level in every year excluding those listed above. Frost damage of once blooming roses limited their flowering; however, the many-year data-sets showed a trend for decreased frost damage and improved abundance of flowering, and these results can be interpreted as a response to the increase of average air temperature. The timing of bud breaking and leaf development in all climber roses was strictly correlated with average air temperature in the dormancy period. The reactions of climber roses to weather conditions confirmed the influence of climatic changes on ornamental crop plants in Central Europe, introducing the potential possibility for the wider application of climber roses, but without certainty of flowering every year.

THE DISTRIBUTION OF AERIALLY-APPLIED SPRAY DEPOSITS IN SPRUCE TREES

1978 ◽  
Vol 110 (12) ◽  
pp. 1259-1267 ◽  
Author(s):  
J. A. Armstrong ◽  
W. N. Yule
Keyword(s):  
Forest Canopy ◽  
Ground Level ◽  
Weather Conditions ◽  
White Spruce ◽  
Weather Factors ◽  
Downwind Side ◽  
Liquid Chromatographic Analysis ◽  
Spray Deposit ◽  
Glass Plates ◽  
Liquid Chromatographic

AbstractA plot of 6 m tall white spruce trees was treated with an aerial application of an oil-base spray containing a non-toxic compound, Tris (2 ethyl hexyl) phosphate (referred to as TOF), which was amenable to gas-liquid chromatographic analysis The spray was formulated and applied at a rate to approximate the eastern Canadian operational spruce budworm control sprays. Meteorological measurements were made in the airspace from mid-crown height to the height of spray emission for the period of spray application and deposition. Spray deposit collection units (kromekote cards and glass plates) were used to record spray deposit at ground level.Foliage samples and complete branches were taken from each of three trees at a series of heights and each of the four compass quadrants and returned to the laboratory for chemical analysis. Spray deposit was determined in terms of ppm TOF on the foliage. The kromekote cards provided information from which the drop size characteristics of the spray cloud and the deposit in terms of drops/cmK were determined; a colorimetric analysis of spray deposit on the glass plates indicated the volume of spray deposited.Analysis of the spray deposits on the foliage indicated gradients in deposits with most on the upper, outer, upwind portions of the trees and least on the lower, inner, downwind portions. These differences were significant. These gradients can be attributed to two weather factors (a) the prevailing wind drifting the pesticide cloud through the forest canopy resulting in a filtering to produce a decreasing gradient from upwind to downwind side of the tree, and (b) air eddies around the tree tops resulting in an increased deposit and slight penetration of the spray cloud on the outer downwind portions of the tree.This study demonstrates that a finely atomized spray applied to a white spruce forest under suitable weather conditions will give a deposit on the outer portions of the tree with a variation of only about 50% in spray deposit but with significantly less deposit on the inner, lower portions of the tree.

scholarly journals Specific nature of the integrative (complex) effect of environmental factors on hazelnut cultivars in the Russian humid subtropics

2021 ◽  
Vol 182 (1) ◽  
pp. 22-32
Author(s):  
T. D. Besedina ◽  
A. P. Boyko ◽  
Ts. V. Tutberidze ◽  
N. S. Kiseleva
Keyword(s):  
Environmental Factors ◽  
Air Temperature ◽  
Large Scale ◽  
Weather Conditions ◽  
Limiting Factors ◽  
Coefficient Of Determination ◽  
Weather Factors ◽  
Specific Nature ◽  
Complex Effect ◽  
Temperature And Humidity

Corylus ponticaK. Koch is a valuable nut crop. The expediency of the crop’s large-scale cultivation calls for measuring the parameters of agroclimatic indicators, ranging in variability, intensity, and duration of their impact. Environmental factors were assessed using phenological techniques based on recording the flowering and fruiting dates, recognized as the function demonstrating the complex effect of these factors on the hazelnut yield throughout the crop’s perennial cycle. Climate change urges the selection of adaptable cultivars for such areas where limiting factors are turning into stressors. Dependence of hazel cultivars on climate indicators (air temperature and humidity, and total precipitation) was observed in the phases of harvest formation. The crop’s genotypic diversity contributed to the specific nature of the complex effect produced by environmental factors. Peculiar responses of hazel plants to weather conditions in both flowering and fruiting phases were instigated by the biology of their development. Flowering started in January and depended on air temperature and humidity. Fruiting was affected by air temperatures and precipitation amounts (in July/August). Dependencies between yield and weather were well expressed, with module values of 0.86–1.0 (p< 0.05). The effect size of limiting factors is better measured with the coefficient of determination (%), a direct indicator of the correlations between harvest and weather factors. Flowering (I–III) under unpredictable conditions is regarded as a “critical” stage in the ontogenesis of hazel trees. No less critical is the fruiting phase, occurring simultaneously with the setting and differentiation of generative organs for the next year’s yield.Registration of limiting factors and their variations over the perennial plant cycle made it possible to recommend cvs. ‘Cherkesskiy-2’, ‘Anastasiya’, ‘Kristina’ and ‘Viktoriya’ as adaptable to the subtropics of Krasnodar Territory.

The Effects of Exercise Commitment Facilitated by Service Quality of Smartphone Exercise Applications on Continued Exercise Intention

2019 ◽  
Vol 118 (1) ◽  
pp. 14-19
Author(s):  
Boo-Gil Seok ◽  
Hyun-Suk Park
Keyword(s):  
College Students ◽  
Factor Analysis ◽  
Regression Analysis ◽  
Statistical Analysis ◽  
Correlation Analysis ◽  
Service Quality ◽  
Frequency Analysis ◽  
Primary Data ◽  
Exercise Intention

Background/Objectives: The purpose of this study is to examine the effects of exercise commitment facilitated by service quality of smartphone exercise Apps on continued exercise intention and provide primary data for developing and/or improving smartphone exercise Apps. Methods/Statistical analysis: A questionnaire survey was conducted amongst college students who have experiences in using exercise App(s) and regularly exercise. The questionnaire is composed of four parts asking about service quality, exercise commitment, continued exercise intention, which were measured with a 5-point Likert Scale, and demographics. Frequency analysis, factor analysis, correlation analysis, and regression analysis were carried out to analyze the obtained data with PASW 18.0.

Structural Relationships among Customer Delight, Exercise Commitment, and Psychological Happiness

2019 ◽  
Vol 118 (1) ◽  
pp. 8-13
Author(s):  
Boo-Gil Seok ◽  
Hyun-Suk Park
Keyword(s):  
College Students ◽  
Factor Analysis ◽  
Statistical Analysis ◽  
Confirmatory Factor Analysis ◽  
Correlation Analysis ◽  
Frequency Analysis ◽  
Structural Correlation ◽  
Structural Relationships ◽  
Confirmatory Factor ◽  
Customer Delight

Background/Objectives: The purpose of this study is to find out the structural relationships among customer delight, exercise commitment, and psychological happiness to contribute developing exercise Apps. Methods/Statistical analysis: A questionnaire survey was conducted and 160 college students who are familiar with mobile exercise applications participated. The data analyzed with frequency analysis, exploratory factor analysis, confirmatory factor analysis, correlation analysis, and structural correlation analysis. The validity and the reliability were obtained: customer delight (χ2=26.532, df=14, CFI=.985, TLI=.971, RMSEA=.075), exercise commitment (χ2=113.802, df=49, CFI=.956, TLI=.941, RMSEA=.091), and psychological happiness (χ2=15.338, df=8, CFI=.989, TLI=.980, RMSEA=.076, and Cronbach’s α=.906~.938).

AS INUNDAÇÕES DE 2009 NA AMAZÔNIA E SUAS RELAÇÕES COM O DESENVOLVIMENTO SUSTENTÁVEL: IMPACTOS AO PRODUTO INTERNO BRUTO MUNICIPAL

GEOgraphia ◽  
2018 ◽  
Vol 20 (43) ◽  
pp. 101
Author(s):  
Alex Santiago Nina ◽  
Cláudio Fabian Szlafsztein
Keyword(s):  
Sustainable Development ◽  
Correlation Analysis ◽  
Gross Domestic Product ◽  
Natural Disasters ◽  
Economic Performance ◽  
Domestic Product ◽  
Economic Losses ◽  
Palabras Clave ◽  
Linear Correlation Analysis

Nos últimos anos, tem aumentado a frequência dos desastres naturais na Amazônia, concomitantemente com a necessidade de estimar os seus prejuízos econômicos. Este trabalho tem como objetivo verificar qual é o tipo e a intensidade do impacto das inundações de 2009, consideradas as maiores já registradas na Amazônia, no crescimento do Produto Interno Bruto (PIB) municipal. A metodologia consistiu na análise de correlação linear entre o desempenho econômico e algumas variáveis referentes ao tipo de inundação e indicadores socioeconômicos. Os resultados mostram que as inundações bruscas são as mais problemáticas em longo prazo. As principais estratégias a serem adotadas perpassam pela inclusão de ações de mitigação de desastres naturais ao planejamento do desenvolvimento sustentável da Amazônia. Palavras-chave: Produto Interno Bruto. Inundação. Amazônia. THE 2009 FLOODS IN THE AMAZON AND ITS RELATIONSHIP WITH SUSTAINABLE DEVELOPMENT: IMPACT ON THE MUNICIPAL GROSS DOMESTIC PRODUCT Abstract: In the last years, have been increase the frequency of natural disasters in Amazon, concomitantly whit the need of estimate their economic losses. This work have the objective of check what is the type and intensity of 2009 floods impacts, considered the major already registered in Amazon, to the increase of municipal Gross Domestic Product (GDP). The methodology was the linear correlation analysis between the economic performance and some variable relative to inundation type and socioeconomics indicators. The results bring which the fast floods are the major problem in the long term. The means strategies to be adopted are the inclusion of natural disasters mitigation actions in plan of sustainable development of Amazon. Keywords: Gross Domestic Product. Flood. Amazon. LAS INUNDACIONES DE 2009 EN LA AMAZONÍA Y SU RELACIÓN CON EL DESARROLLO SOSTENIBLE: IMPACTO EN EL PRODUCTO INTERNO BRUTO MUNICIPAL Resumen: En los últimos años ha aumentado la frecuencia de los desastres naturales en la Amazonia, concomitantemente con la necesidad de estimar sus prejuicios económicos. Este trabajo tiene como objetivo verificar cual es el tipo y la intensidad del impacto de las inundaciones de 2009, consideradas las mayores ya registradas en la Amazonia, al crecimiento del Producto Bruto Interno (PBI) municipal. La metodología consistió el análisis de correlación linear entre el desempeño económico y algunas variables referentes al tipo de inundación e indicadores socioeconómicos. Los resultados muestran que las inundaciones bruscas son las mas problemáticas a largo plazo. Las principales estrategias a ser adoptadas pasan por la inclusión de acciones de mitigación de desastres naturales a la planificación del desarrollo sostenible de la Amazonia. Palabras clave: Producto Interno Bruto. Inundaciones. Amazonia. 

Sign in / Sign up

Export Citation Format

Share Document