Consulta: subjectFacets:"Experimental error"
Registros recuperados: 5
Data/hora: 02/06/2024 02:35:00

Planning and implementing experiments and analyzing experimental data in vegetable crops: problems and solutions
Provedor de dados: 75
Autores: Lúcio,Alessandro Dal’Col; Sari,Bruno Giacomini.
ABSTRACT The statistical interpretation of experimental results is inherent to the research process. Therefore, every researcher is expected to have basic understanding on the subject. In vegetable crops, the planning, implementing and data gathering is more complex due to specific aspects related to this group of plants, such as intensive management and high labor requirement to carry out the experiments, uneven fruit maturation and heterogeneity of the experimental area. Since all these factors are sources of variability within the experiment, circumventing them in the experiment planning and implementing phases is fundamental to reduce the experimental error. Furthermore, the knowledge of statistical tests and the assumptions for their use is equally...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural experimentation; Experimental precision; Experimental error; Experimental designs; Applied statistics; Analysis of variance; Horticulture.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000300316

Sample size for estimating the population of stink bugs in soybean crops
Provedor de dados: 124
Autores: Stürmer,Glauber Renato; Cargnelutti Filho,Alberto; Guedes,Jerson Vanderlei Carús; Stacke,Regis Felipe.
It is important to quantify the population of stink bugs in the soybean, in order to determine the actions which are necessary for their control to protect the crop from losses in production, together with a reduction in cost and less environmental impact. The objectives of this study were to determine the sample size (the number of sampling points) needed to estimate the average population density of the bugs, and to verify the variability in sample size for the phases and species of the bugs and the phenological stages of the plants. In an area of 6.16 ha of soybeans, a grid of 154 sampling points, spaced 20 × 20 m apart, was laid out. Population-density data were collected for nymphs and adults of the species Dichelops furcatus (Fabricius, 1775),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sample sizing; Experimental error; Pentatomidae.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000100019

A classification proposal for coefficients of variation in Eucalyptus experiments involving survival, growth and wood quality variables
Provedor de dados: 53
Autores: Mora,Freddy; Arriagada,Osvin.
ABSTRACT The objective of this study was to present a classification proposal for coefficients of variation (CV) in Eucalyptus experiments, aiming at providing a useful tool for experiments involving growth, survival and wood quality traits. Ninety-four studies were selected from a search for peer-reviewed journals yielding a total of 508 data. The CVs were classified as low, moderate, high and very high. The mean, standard deviation, maximum and minimum values, skewness and kurtosis were estimated to describe the distribution shape. The Shapiro-Wilk test confirmed that all variables satisfied the assumption of normality (p &lt; 0.05). The results indicated that the growth traits had the highest variability, being variables strongly affected by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus spp.; Experimental accuracy; Experimental error; Rank-ordering.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000300263

Variability, plot size and border effect in lettuce trials in protected environment
Provedor de dados: 53
Autores: Santos,Daniel; Lúcio,Alessandro Dal’Col; Cargnelutti Filho,Alberto; Lopes,Sidinei José; Olivoto,Tiago.
ABSTRACT The variability within rows of cultivation may reduce the accuracy of experiments conducted in a complete randomized block design if the rows are considered as blocks, however, little is known about this variability in protected environments. Thus, our aim was to study the variability of the fresh mass in lettuce shoot, growing in protected environment, and to verify the border effect and size of the experimental unit in minimizing the productive variability. Data from two uniformity trials carried out in a greenhouse in autumn and spring growing seasons were used. In the statistical analyses, it was considered the existence of parallel cultivation rows the lateral openings of the greenhouse and of columns perpendicular to these openings....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Experimental accuracy; Experimental design; Experimental error; Lactuca sativa L.; Greenhouse.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000200230

Classification of the coefficients of variation for sugarcane crops
Provedor de dados: 65
Autores: Couto,Mauricio Farias; Peternelli,Luiz Alexandre; Barbosa,Márcio Henrique Pereira.
The objective of this paper was to evaluate the range of classification of variation coefficient in experiments with sugarcane. For this study, some of the variables that are mostly used by researchers of the culture were considered. The data was obtained after extensive bibliographical revision from scientific journals, data base from the improvement program of sugarcane from the Federal University of Viçosa, master dissertations, doctorate thesis and technical reports. Classification ranges were proposed according to the Costa method, in which is based the use of a median and pseudo-sigma. The variables tons of stalks per hectare and tons of pol per hectare presented the highest ranges of the classification of the coefficients of variation, while the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp; Experimental precision; Experimental error.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000600003