Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

The polyculture systems guarantees food to small farmers, would ensure sustainable agriculture, high productivity per unit area and lessen the natural risks of agriculture. Within this context the objective of this study was to evaluate the production cost and profitability of an organic polyculture system comprising passion fruit, maize, pineapple and cassava in association with the cover crops. This research was carried out at the Seridó Ecological Farm,  in the Municipality of Rio Branco, Acre State, from 2009 to 2011, in the completely randomized block design in a split plot arrangement with three repetitions and comprised plots containing passion fruit supported by espaliers located 3 m or 4 m apart. Plots were divided into subplots containing the cover crops jack-bean, crotalaria, tropical kudzu, peanut forage or spontaneous plants (treatments), and maize. The pineapple and cassava were planted between the espaliers. The effects of different cover crops were not so evident in plots with 3 m-spaced espaliers (P < 0.05) which increased productivity and production cost, providing a lower cost benefit ratio. The organic polyculture of passion fruit with pineapple, maize and cass in plots with 4 m-spaced espaliers, with the soil covered by jack bean increased total and net revenue, cost benefit ratio and economic feasibility.

The objective of this study was to evaluate the tuberous root characteristics of sweet potato clones using multivariate techniques for selection of superior genotypes, the present research was carried out in the Experimental area of the Plant Genetic Breeding Sector of the Agrarian Sciences Center of the Federal University of Alagoas (SMGP/CECA/UFAL). Were evaluated 44 new clones originated from progenies of half-siblings and germanic siblings, in addition to the cultivar Sergipana Vermelha, in lines of 5 m in length, spacing 1.0 mx 0.5 m, totaling a total area of 5 m²/clone. The harvest was done at 120 days after planting the branches, in which the production of non-commercial tuberous roots (PRTNC) was evaluated, production of commercial tuberous roots (PRTC), production of tuberous roots (PTRT), total number of tuberous roots (NTRT), average weight of commercial tuberous roots (PMRTC), predominant color of tuberous root skin (CPPERT) and predominant color of the tuberosal root pulp (CPPORT). Descriptive statistics, correlation technique and principal component analysis were used. It was observed that clones 23, 36, 17 and 37 presented interesting agronomic characteristics, being recommended for the cultivation and in the analysis of main components, the variables PTRT and PRTC presented greater importance, reflecting that they discriminate the clones satisfactorily.

The objective was to characterize a floristic and phytosociology of a fragment of cerrado sensu stricto, located in Gurupi, Tocantins. The study was carried out in the legal Reserve of the experimental farm of the Federal University of Tocantins, Campus of Gurupi, Tocantins, Brazil. Five porcelains of 20x50m were implanted, totaling 5000sqm and all compostations with a circumference greater than or equal to 10 cm, at 0 cm at the soil level (CAS) were implanted. Foramaler 906 aphid shrub-arboreal belonging to 42 families, 102 species and 78 genera. The families that stood out in number of individuals, frequency, dominance were Myrtacea, Vochystaceae, Burseraceae and Fabaceae, among the indications of the main beings Myrcia fallax (Rich) DC, Protium heptaphyllum (Aubl) Marchand and Qualea multiflora Mart. The diversity index of Shannon (H ') was 3.70 and equability J'0,80, being considered for the cerrado region.

The Cerrado comprises a vast ecoregion in central Brazil where plants show both growth and nitrogen fixation deficiencies due to low soil fertility. Farmers may overcome such problem using species of microorganisms capable of improving soil fertility such as the Rhizobia bacteria. This work aimed to assess the ability of phosphate solubilization and synthesis of indoleacetic acid (IAA) of Rhizobium isolates obtained from Cerrado soils in the state of Tocantins, Brazil, evaluating their symbiotic efficiency in cowpea (Vigna unguiculata L. Walp.) plants. We used a total of 32 isolates (or strains) of Rhizobium and a reference species of Bradyrhizobium. The capacity of phosphate solubilization and synthesis of IAA was evaluated in vitro, while the symbiotic function of rhizobia isolates and the effect on cowpea biomass was assessed in a greenhouse. Only eight strains were able to solubilize calcium phosphate, while all isolates produced IAA. The rhizobia inoculation caused a significant increase in biomass and nodulation of cowpea. The isolates UFT R122 and UFT R124 stood out with the highest values for the studied parameters, showing rises above 33% of relative efficiency in comparison to the treatment with nitrogen fertilization. By associating the results of phosphate solubilization capacity, IAA synthesis, symbiotic ability, and nodulation, we conclude that the isolates that showed good performance are potential inoculants for cowpea in Cerrado soils.

In sowing cowpea's cultivation, adverse factors such as water stress may adversely affect the establishment of the stand . In this sense, the aim of the present study was to evaluate the germination of seeds of two varieties of cowpea under the influence of different levels of available water in the soil. The experiment was conducted under plastic tunnel conditions the Federal University of Campina Grande, Campus de Pombal, Paraíba, adopting the experimental randomized block design with the treatments distributed in factorial arrangement 4 x 2, corresponding to four levels of available water (40, 60, 80 and 100%) and two varieties of cowpea (BRS Pujante and Costela de vaca), with three repetitions. They were evaluated: First Emergency Count, emergency speed index and emergency percentage. The levels of available water in the soil of 40 and 60% Water available are limiting in the initial development stage of the cowpea, reducing the emergence of both varieties studied. The level of 80% of available water in the soil is satisfactory the emergence of the cowpea plants, regardless of the variety. The costela de vaca variety obtained higher percentages of emergence and greater vigor under water stress conditions, than the BRS Pujante variety.

The rot Callosobruchusmaculatus (Fabr.) is considered the main pest of grains and stored seeds of cowpea-been, as it causes direct and indirect damages, which can lead to quantitative and qualitative losses, making commercialization or consumption impossible.To the control of this pest, synthetic insecticides we have been used, which over the years have caused many problems to human health and to the environment.Botanic insecticides have become a promising alternative in the control of pests on stored grains.The objective of this work was to evaluate the ovicidal and repellent activity of citronella, Cymbopogonnardus, on C. maculatus.In the confinement experiment, the insects were kept for 24 hours in a container containing 10g of cowpea beans cv. BRS Guariba with concentrations 1.0g; 0.1g; 0.01g; 0.001g of the powder of the referred species and witness (grain without dust), and in the repellency experiment, a six-way arena was used, where the insects had the possibility to choose between the grains with the tested concentrations or witness. The delimitationused was completely randomized with five replicates and five treatments for the two experiments.The concentration of 1.0g of the citronella powder presented ovicidal and repellent activity to C. maculatus, allowing, on average, a lower number of eggs laid and an unexpressive appearance of insects when compared to the other concentrations and control.

Index including all the acticles, poetry, biographies, and texts published in the forty three issues of "Poesía. Revista Ilustrada de Información Poética", classified and sorted in different sections.

Manuel Machado's attitudes with regard to the catolicism evolve, from the progressive liberalism of his paternal family up to the ascetism that characterizes the life and the writings of the last year of the poet. The Machado's spiritual biography is described, on one hand, and, on the other, the presence of the religious topics in his poetical work.

If we define rigorous notions of modernity and postmodernity, and if we take into account all aspects of Borges' work instead of some selected items, it results that his literature cannot be regarded as essentially postmodern.

In the Antiquity, stylistic heterogeneity was not considered a deficiency of a text; for, at the time, eloquence was synonym of the capacity to vary stylistic registers in accordance with the specific needs of the discourse. In this article, the concept of “Decoro”, pillar of the classic rhetorical tradition, is used as a method of analysis to make sense of the stylistic versatility of moderns essays in general. I will analyse the stylistic variety of the essay “Dos viejas discusiones” by the Mexican essayist Alfonso Reyes. The analysis confirms that the stylistic register is actively used by the author to cater for the specific persuasive aims at each level of the discourse.