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Articles by Larissa Pereira Ribeiro
Total Records ( 4 ) for Larissa Pereira Ribeiro
  Paulo Eduardo Teodoro , Carlos Antonio da Silva Junior , Caio Cezar Correa , Larissa Pereira Ribeiro , Elisa Pereira de Oliveira , Miriam Ferreira Lima and Francisco Eduardo Torres
  The objective of this study was to identify the primary and secondary components that are directly or indirectly related to grain yield and this relationship depends on the type of hybrid (single or triple). The maize experiment was conducted in the agricultural year 2011/12, in the State University of Mato Grosso do Sul, with eighteen treatments, consisting of eleven simple hybrids and seven triple hybrids arranged in a randomized block design with four replications. The variables evaluated were plant height and first ear of corn, length and diameter ear, number of rows per ear, number of kernels per row, weight of hundred grains and productivity. The data of simple hybrids and triple hybrids were grouped for comparison by test t at 5% probability. Subsequently, were estimated Pearson correlation coefficients between the parameters evaluated for each genetic class, proceeding the diagnosis of multicollinearity. Then, the correlations between other features and productivity (dependent variable) were split into direct and indirect effects, establishing relations of cause and effect between them. The results show that the relationship between direct and indirect effects on productivity depend on the genetic class. The variable number of grains per row and weight of hundred grains are directly correlated to grain yield and are indirectly influenced through the effects of the length and ear diameter, respectively.
  Carlos Antonio da Silva Junior , Paulo Eduardo Teodoro , Guilherme Fernando Capristo Silva , Larissa Pereira Ribeiro , Flavia Alves da Silva , Caio Cezar Guedes Correa , Roque Apolinario Alves da Luz Junior and Francisco Eduardo Torres
  Determining the genetic variability and correlations between traits of interest for selection in a population is one of the stages in a breeding program. The objectives of this study was to evaluate the potential for genetic improvement of a population composed of twelve commercial soybean genotypes, were estimated genetic and phenotypic descriptors and correlations between morphological traits of the population. The experimental design was used in randomized block design with four replications. The descriptors measured were plant height and first pod insertion, number of pods and ramifications, mass of hundred grains and yield grains. The yield grains presented more genotypic coefficient of variation, ratio b and herdability. This descriptor obtained phenotypic correlations significant positive (p<0.01), with number of pods, ramifications and mass hundred grains, indicating that the selection of plants with larger number of ramifications entailed, therefore, more productive genotypes. The genotype correlations had the same sign and in most cases superior to their corresponding phenotypic correlations values, indicating that the phenotypic expression is decreased compared to environmental influences. Environmental correlations between descriptors with differences in magnitude and sign, in relation to the respective genotype correlations, revealed that the environment favored one character over another and that the genetic and environmental causes of variation have different physiological mechanisms, defaulting the indirect selection.
  Paulo Eduardo Teodoro , Carlos Antonio da Silva Junior , Larissa Pereira Ribeiro , Flavia Alves da Silva , Caio Cesar Guedes Corraa , Angelita dos Santos Zanuncio and Francisco Eduardo Torres
  Green manure brings numerous benefits that promote, essentially, the maintenance and conservation of agro-systems and its implementation is fundamental to Brazilian Cerrado region. In this scenario, the present research aimed to determine the sample size for estimation biomass and productivity of sunn and showy rattlebox. The experiment was installed in the experimental area of the State University of Mato Grosso do Sul-Unit University Aquidauana (UEMS/UUA), located in the Brazilian Cerrado. It were randomly selected 45 plants in the experimental area of each crop to determine Fresh Mass (FM), Dry Mass (DM) and yield (YI), being the measures of central tendency, variability, asymmetry and kurtosis were calculated and checked for normality by Lilliefors’s test. In sunn and showy rattlebox, 340 and 197 plants, respectively, are sufficient for the estimation of evaluated descriptors, with confidence interval of 95%. The species evaluated did not differ for the characters FM and DM, both of which are recommended for cultivation in the Cerrado.
  Elisa Pereira de Oliveira , Paulo Eduardo Teodoro , Carlos Antonio da Silva Junior , Simone Botelho Benites , Larissa Pereira Ribeiro and Francisco Eduardo Torres
  Objective: The aim of this study was to evaluate the influence of seed type and sampling times in the agricultural year 2011/2012 on the production of Dry Mass (DM) of cultivars of Panicum maximum. Methodology: The experiment was carried out at the Universidade Estadual de Mato Grosso do Sul, Campus Aquidauana-MS. The statistical design was a randomized block in a split plot with four replications. The plots consisted of three cultivars of Panicum maximum: Tanzânia, Mombaça and Massai. The subplots comprised two seed treatments: Conventional seed with high purity and seed encrusted, who went through the process of chiseling, fungicide and subsequently received péleti containing macro and micronutrients. The first cut occurred on 22 October, 2011 the remaining forage cuts were 60 days of regrowth, which it was assessed the following parameters: Dry mass of leaves, culm and roots and leaf/culm ratio (L/C). Results: The seed coating did not affect the production of DM. Mombaça showed greater DM and leaf/culm ratio in relation to Tanzânia and Massai. Conclusion: In the region of Aquidauana-MS, Panicum maximum cultivars showed low forage production during the winter season, characterizing the summer as the best period of forage production for the three cultivars of this species.
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