Inter-comparison of methods to homogenize daily relative humidity

2018 ◽  
Vol 38 (7) ◽  
pp. 3106-3122 ◽  
Author(s):  
Barbara Chimani ◽  
Victor Venema ◽  
Annemarie Lexer ◽  
Konrad Andre ◽  
Ingeborg Auer ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Comparison Of Methods ◽  
Daily Relative Humidity

scholarly journals Predicting Fusarium Head Blight Epidemics with Boosted Regression Trees

2014 ◽  
Vol 104 (7) ◽  
pp. 702-714 ◽  
Author(s):  
D. A. Shah ◽  
E. D. De Wolf ◽  
P. A. Paul ◽  
L. V. Madden
Keyword(s):  
Logistic Regression ◽  
Relative Humidity ◽  
Fusarium Head Blight ◽  
Regression Models ◽  
Boosted Regression Trees ◽  
Misclassification Rate ◽  
Head Blight ◽  
Data Set ◽  
Logistic Regression Models ◽  
Daily Relative Humidity

Predicting major Fusarium head blight (FHB) epidemics allows for the judicious use of fungicides in suppressing disease development. Our objectives were to investigate the utility of boosted regression trees (BRTs) for predictive modeling of FHB epidemics in the United States, and to compare the predictive performances of the BRT models with those of logistic regression models we had developed previously. The data included 527 FHB observations from 15 states over 26 years. BRTs were fit to a training data set of 369 FHB observations, in which FHB epidemics were classified as either major (severity ≥ 10%) or non-major (severity < 10%), linked to a predictor matrix consisting of 350 weather-based variables and categorical variables for wheat type (spring or winter), presence or absence of corn residue, and cultivar resistance. Predictive performance was estimated on a test (holdout) data set consisting of the remaining 158 observations. BRTs had a misclassification rate of 0.23 on the test data, which was 31% lower than the average misclassification rate over 15 logistic regression models we had presented earlier. The strongest predictors were generally one of mean daily relative humidity, mean daily temperature, and the number of hours in which the temperature was between 9 and 30°C and relative humidity ≥ 90% simultaneously. Moreover, the predicted risk of major epidemics increased substantially when mean daily relative humidity rose above 70%, which is a lower threshold than previously modeled for most plant pathosystems. BRTs led to novel insights into the weather–epidemic relationship.

scholarly journals Relation between some climate parameters inside and outside the stable in the course of the year

2009 ◽  
Vol 57 (4) ◽  
pp. 125-132 ◽  
Author(s):  
Lucie Walterová ◽  
Lenka Šarovská ◽  
Daniel Falta ◽  
Gustav Chládek
Keyword(s):  
Relative Humidity ◽  
Outdoor Temperature ◽  
Climate Parameters ◽  
Temperature Humidity Index ◽  
Humidity Index ◽  
Autumn And Winter ◽  
Daily Relative Humidity ◽  
Indoor And Outdoor

The objective of the present study was to evaluate the relation between some climate parameters inside and outside the stable in the course of the year. Investigations were carried out from 1 July 2007 to 30 June 2008 at the School Farm in Žabčice. We monitored the following micro-climate pa­ra­me­ters: temperature (°C), relative humidity (%) and the temperature-humidity index (THI) inside and outside the stable. We used the statistical programme UNISTAT version 5.1.11 to calculate the average monthly temperatures, relative humidity and the THI inside and outside the stable.Measurements carried out throughout the whole year revealed that the average daily outdoor temperature was always lower than the temperature monitored inside the stable. The differences between the outdoor and indoor temperatures were more marked in winter; in summer the differences were considerably lower. The coefficient correlations confirmed this finding; the temperatures were the highest in July and the lowest in autumn and winter. The same results and tendencies were monitored in terms of the average daily THI values. Much like the temperatures also the differences in high average daily values of relative humidity between the outside and inside environment of the stable were lower. Since the relative humidity was higher in winter than in summer the differences between the indoor and outdoor stable values were more marked in summer than in winter. In contrast to the temperature and THI, in one half of the cases the average daily relative humidity was higher outside the stable than inside and vice versa.

scholarly journals Effects of morning vs. evening inoculation on the development of Neonectria ditissima lesions

2018 ◽  
Vol 71 ◽  
pp. 353
Author(s):  
Emma Patrick ◽  
Anthea Garmey ◽  
Lauren Turner ◽  
Rebecca E. Campbell ◽  
Monika Walter
Keyword(s):  
Relative Humidity ◽  
Environmental Conditions ◽  
Weather Conditions ◽  
Symptom Expression ◽  
Symptom Development ◽  
Apple Trees ◽  
Successful Development ◽  
Disease Symptoms ◽  
Average Daily Temperature ◽  
Daily Relative Humidity

The study of Neonectria ditissima causing European canker in apple trees is often dependent on controlled inoculation of tree wounds and development of canker lesions. This makes the success of the initial inoculation crucial for time-efficient research. The effect of morning vs. evening inoculation on the successful development of canker lesions was investigated. Ninety-six ‘Royal Gala’ trees were inoculated on six different days (February—March 2017), which covered several different weather conditions. On each inoculation day, 16 trees were inoculated on four rasp and four picking wounds, at 10:00 and 19:00 hours. These were then assessed over the following 8 months for presence of disease symptoms. Irrespective of rain (0—4.5 mm rainfall at the day of inoculation), temperature (average daily temperature of 14.8—21.3˚C), and humidity (average daily relative humidity of 59.8—94.2% rH), neither the day nor the hour of inoculation affected symptom development. However, more inoculated wounds developed symptoms in rasp wounds (91%) than in picking wounds (63%). Under the environmental conditions tested, inoculation timing (date and hour) had little effect on N. ditissima symptom expression.

scholarly journals 387 A Website for Evaluating Postproduction Quality of Parade™ Roses

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 459E-459
Author(s):  
Ria T. Leonard ◽  
Terril A. Nell ◽  
Lars Hoyer ◽  
Jim E. Barrett ◽  
David G. Clark
Keyword(s):  
North America ◽  
Relative Humidity ◽  
Cultural Practices ◽  
Link Type ◽  
Time Of Year ◽  
Cooperative Project ◽  
Daily Relative Humidity ◽  
Over Time ◽  
The Web

Postproduction evaluation trials have been developed in North America and Europe to test postproduction performance of potted roses from individual growers. The results of the trials have been compiled on the “Roses On The Web” Website (www.parade.dk). Roses on the WEB is a cooperative project between Poulsen Roses ApS, Denmark, the Danish Institute of Agricultural Sciences, and the Univ. of Florida. The goal of the Website is to provide growers participating in the evaluation trials a quick and easy way to obtain results on the postproduction quality of their roses. Plants receive 4 days of simulated transport, sleeved in a box in darkness at 16 °C. After transport, plants are maintained at 20 °C at 8 μmol·m–2·s–1 for 12 hours/daily. Relative humidity is maintained at 55% ± 5%. To determine quality, several parameters are recorded at day 0 (day of arrival), 11, 18, 22, and 28. The recordings include the number of open and damaged flowers and buds, percentage of damaged leaves, and the presence of disease and pests. Based on the results of all the measurements, each plant is given a postproduction rating or index, indicating quality. Results from each trial are tabulated and stored on the Website. Growers are able to view their results by entering a password. Growers can evaluate their quality over time and are also able to compare their quality with other growers. Many quality problems are manifested in the postproduction environment and can often be directly related to incorrect greenhouse conditions and/or cultural practices. “Roses On The Web” is a tool that provides quick, up-to-date information that can be crucial to the success of a grower. Differences in quality were found based on grower, time of year and variety.

scholarly journals AVALIAÇÃO DE DIFERENTES MÉTODOS DE ESTIMATIVA DA EVAPOTRANSPIRAÇÃO DA CULTURA DO CRISÂNTEMO (Chrisantemum spp.) CULTIVADO EM ESTUFA PLÁSTICA

Irriga ◽  
2006 ◽  
Vol 11 (2) ◽  
pp. 139-149 ◽  
Author(s):  
André Luiz Teixeira Fernandes ◽  
Marcos Vinícius Folegatti ◽  
Antonio Roberto Pereira
Keyword(s):  
Wind Speed ◽  
Relative Humidity ◽  
Solar Radiation ◽  
Comparison Of Methods ◽  
Weather Station ◽  
Automatic Weather Station ◽  
Pan Evaporation ◽  
Data Logger ◽  
Control Irrigation ◽  
Weighing Lysimeter

AVALIAÇÃO DE DIFERENTES MÉTODOS DE ESTIMATIVA DA EVAPOTRANSPIRAÇÃO DA CULTURA DO CRISÂNTEMO (Chrisantemum spp.) CULTIVADO EM ESTUFA PLÁSTICA  André Luiz Teixeira Fernandes1; Marcos Vinícius Folegatti2; Antonio Roberto Pereira21Pró Reitoria de Pesquisa e Pós Graduação, Universidade de Uberaba, Uberaba, MG, andré[email protected] de Engenharia Rural, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP  1 RESUMO  Com o objetivo de estudar métodos de controle de irrigação numa cultura de crisântemo, instalou-se uma estação agrometeorológica automática, numa estufa de 5600 m2, com  sensores de temperatura do ar, velocidade do vento, umidade relativa do ar, radiação solar global e lisímetro de pesagem com célula de carga, conectados a um coletor de dados. A partir dos dados meteorológicos obtidos, estimou-se a evapotranspiração da cultura utilizando-se os seguintes métodos: Tanque evaporimétrico, Camargo, Makkink, Radiação solar, Jensen-Haise, Linacre, Hargreaves-Samani, Penman, Penman-piche e Penman-Monteith. Os resultados foram comparados com as medições do lisímetro, considerado padrão. Os métodos que obtiveram maiores índices de correlação foram: Jensen-Haise (72,50%); Radiação Solar (71,53%); Makkink (71,53%), Penman-Monteith (71,16%) e Penman (72,09%).UNITERMOS: evapotranspiração, comparação entre métodos, cultura do crisântemo, cultivo protegido.  FERNANDES, A. L. T.; FOLEGATTI, M. V.; PEREIRA, A. R. VALUATION OF DIFFERENT EVAPOTRANSPIRATION ESTIMATE METHODS FOR (Chrysanthemum spp) CULTIVATED IN PLASTIC GREENHOUSE  2 ABSTRACT In order to study some methods to control irrigation of a chrysanthemum crop, an automatic weather station was installed inside a 5600 m2 greenhouse with the following sensors connected to a data logger: air temperature, relative humidity, wind speed, solar radiation and a weighing lysimeter. Evapotranspiration (ET) was estimated by the weather station data using the following methods: Solar Radiation, Pan Evaporation, Camargo, Makkink, Jensen-Haise, Linacre, Hargreaves-Samani, Penman, Penman-piche and Penman-Monteith. The results were compared with the ones from the weighing lysimeter data, which were considered standard. The best correlation indices were obtained by: Jensen-Haise (72.50%); solar radiation (71.53%); Makkink (71.53%), Penman-Monteith (71.16%) and Penman (72.09%). KEYWORDS: evapotranspiration, comparison of methods, chrysanthemum crop, protecting culture 

scholarly journals Homogenized Daily Relative Humidity Series in China during 1960–2017

2020 ◽  
Vol 37 (4) ◽  
pp. 318-327 ◽  
Author(s):  
Zhen Li ◽  
Zhongwei Yan ◽  
Yani Zhu ◽  
Nicolas Freychet ◽  
Simon Tett
Keyword(s):  
Relative Humidity ◽  
Daily Relative Humidity

scholarly journals Effects of Climatic Conditions on Bovine Semen Characteristics

2017 ◽  
Vol 65 (1) ◽  
pp. 17-23 ◽  
Author(s):  
Zuzana Biniová ◽  
Jaromír Ducháček ◽  
Luděk Stádník ◽  
Martina Doležalová ◽  
Radim Hájek
Keyword(s):  
Relative Humidity ◽  
Ambient Temperature ◽  
Artificial Insemination ◽  
Sperm Concentration ◽  
Climatic Conditions ◽  
Bovine Semen ◽  
Required Quality ◽  
Daily Relative Humidity ◽  
Artificial Vagina ◽  
Qualitative And Quantitative Characteristics

The present study assessed the effects of climatic conditions and year‑period (month) on both qualitative and quantitative characteristics of bovine semen in Czech Republic. The semen was collected twice a week using artificial vagina at artificial insemination center Hradištko in period 2011 – 2013. The effects of collection month, average daily ambient temperature and average daily relative humidity on volume, sperm concentration and progressive motility above head of collected semen and also on number of produced artificial insemination straws of required quality were analyzed using statistical analysis (procedures: UNIVARIATE, STEPWISE, GLM) in software SAS 9.3 (SAS/STAT® 9.3, 2011). Collection month, average daily ambient temperature, average daily relative humidity, and breed had a significant effect (P < 0.05) on all evaluated characteristics. The maximum values of motility and sperm concentration were found in March and in April. The highest volume of collected semen was found in July and in September and the lowest in November, when also the lowest number of straws was produced. Motility and sperm concentration were significantly influenced by average daily ambient temperature and average daily relative humidity, where the maximum values were recorded in average daily ambient temperature over 14.85 °C and average daily relative humidity over 72.05 %. The results are important to the management of artificial insemination center responsible for planning of semen collection, processing and artificial insemination straws production.

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