Entity

Time filter

Source Type

Guarapuava, Brazil

Venske S.M.S.,Federal Technological University of Parana | Goncalves R.A.,UNICENTRO | Delgado M.R.,Federal Technological University of Parana
Proceedings - Brazilian Symposium on Neural Networks, SBRN | Year: 2012

This paper proposes a method for continuous optimization based on Differential Evolution (DE). The approach named Adaptive Differential Evolution for Multiobjective Problems (ADEMO/D) incorporates concepts of Multiobjective Evolutionary Algorithms based on Decomposition (MOEA/D) and mechanisms of mutation strategies adaptation inspired by the adaptive DE named Self-adaptive Differential Evolution (SaDE). Additionally a new mutation strategy, based on MOEA/D neighborhood concept, is proposed to be used in the strategy candidate pool. ADEMO/D is compared with three multi-objective optimization approaches using a set of benchmarks. The preliminary results are very promising and stand the proposed approach as a candidate to the State-of-art for multi-objective optimization. © 2012 IEEE. Source


Novakowiski J.H.,State University of the Central West | Sandini I.E.,State University of the Central West | Falbo M.K.,UNICENTRO | Cheng N.C.,State University of the Central West
Semina:Ciencias Agrarias | Year: 2011

The diazotrophic bacteria Azospirillum brasilense is an organism able to fix nitrogen of atmosphere and produce plant hormones. Nevertheless, there is lack of information with regard to use in field conditions, especially in production systems that have presence of animals in a determined year period. The objective of paper was to evaluate the association of the nitrogen residual effect of fertilization in pasture winter and the inoculation with A. brasilense in the maize culture. Were carried two experiments in Guarapuava (PR) in season 2008/09 with randomized block design with split plots in three replication. The main parcel consisted of application 5 levels of N (0, 75, 150, 225 e 300 kg ha -1) in pasture of black oat and ryegrass occupied by bovines and 4 treatments in the maize (T1 = control; T2 = inoculation of A. brasilense; T3 = 75 kg ha -1 of N; T4 = 150 kg ha -1 of N). Were evaluated: plants population, ears per plant, productivity, mass thousand grains, damage grains, row per ear and grains per row. There was residual effect of nitrogen applied in the pasture on maize culture. The mass thousand grains and the number of rows per ear of maize presented quadratic response for increase of nitrogen level in the pasture. The inoculation of A. brasilense provided higher productivity than control same with increase the nitrogen level applied in the pasture, with quadratic response in the experiment 1 and linear in the experiment 2. Source


This study aimed to evaluate the occurrence of ground pearl (Eurhizococchus brasiliensis), as well as the vegetative growth and the phenology of 'Isabel', 'Bordô' (Vitis labrusca L.), 'Cabernet Sauvignon', 'Malbec' and 'Merlot' grapes (Vitis vinifera L.) grafted on the rootstocks 'Paulsen 1103' and 'VR 043-43 '. The experiment was carried out at the experimental area of Agronomy Department of Universidade do Centro-Oeste (Unicentro), in Guarapuava, PR, Brazil during the 2010/2011 crop season. The statistical design was randomized blocks in factorial 5 x 2 (cultivar x rootstock), with 10 treatments, five repetitions and three plants per plot. Each block consisted of a plant line. The evaluations were: shoot fresh (SFM) and dry (SDM) mass of material from the production pruning. After harvest, the grapevines were removed from the soil and then the number of ground pearl per plant (GPP), the root fresh (RFM) and dry (RDM) mass, the stem fresh (SFM) and dry (SDM) mass were evaluated. In addition, the duration of the phenological stages was evaluated, according to Eichhorn and Lorenz (1984). It was verified that the vines grafted on 'VR 043- 43' had a lower number of cysts of ground pearl, but this factor had a positive effect only on the vegetative development of American cultivars. For the other variables analyzed there was no influence of the rootstock. Source


This study verified the effect of fertilizer reduction and nitrogen (N) rates and splitting on the growth and yield of potato plants. Two experiments were formed and were planted in January (1st experiment) and November (2nd experiment) 2006 in Guarapuava, Paraná state, Brazil, using cultivar Agata. In the 1st experiment, three treatments were tested with smaller amount of fertilizer compared with the control, which simulated the traditional fertilization, in randomized blocks with 4 replications. In the 2nd experiment, rates (3) and splitting (with and without) of nitrogen (N) were evaluated, in 3 x 2 factorial scheme in randomized blocks with 3 replications. In both experiments, plants were collected at three growth stages: beginning of flowering, maximum shoot growth and after physiological maturity (harvest). At the beginning of flowering, no difference in any analyzed parameters was observed in both experiments. However, at the maximum shoot growth, leaf area index (LAI) and shoot dry weight (DW) were higher in control in the 1st experiment, and N applied totally at planting resulted in plants with higher LAI and tuber DW in the 2nd experiment. At harvest the control had higher tuber mass, mainly because of higher production of middle-sized tubers in the 1st experiment; N rates negatively affected the percentage of tuber DW and interaction occurred with rate and splitting of N in tuber mass: the smallest rate of N was helped by splitting in the 2nd experiment. In this study the traditional growers’ fertilization and the smallest rate of N, splitting half at planting and half at hilling, resulted in high tuber yield. © 2015 Sociedade de Olericultura do Brasil. All rights reserved. Source


In front of impacts arising from the process of urbanization, one of the ways to facilitate the improvement of life quality of urban population is to perform the planning and the planting of trees, in private or public areas. The environmental or socio-economic benefits desired with street trees come from the top of the trees and from the covering mantle formed over the streets. In this way, the goal of this research was to analyze the distribution and dynamics of crown area classes of trees measured in two inventories held in Curitiba streets trees in 1984 and 2010. Data distribution in crown area classes, for the total data and each parcel sampled, demonstrated that there is a tendency for a descending distribution curve type, typical of multi-year and multispecific stands, both for the year 1984 as for the year 2010, with greater frequency of individuals in the crown area class 0{box drawings light vertical and right} 50m 2. However, when data was analyzed for the main species it was found that for some of them the distribution curve changed from a descending type, in 1984, to a unimodal type, in 2010. There was greater_ recruitment of remaining trees in classes 50 - 100m 2 and 100 - 150m 2 and larger class removal of class 0{box drawings light vertical and right} 50m 2. It was concluded that it was possible to understand, in part, behavioral characteristics of the species and verify signs of maturing of Curitiba streets trees when analyzed 26 years later. Source

Discover hidden collaborations