http://repositorio.ufrr.br:8080/jspui/handle/prefix/129 2026-03-16T20:27:45Z 2026-03-16T20:27:45Z Amaya, Jorge Zamir Erazo http://repositorio.ufrr.br:8080/jspui/handle/prefix/873 2023-11-02T05:00:28Z 2017-01-01T00:00:00Z

Título: Substratos na propagação seminífera de sangue de dragão (Croton lechleri Mull. Arg) Autor(es): Amaya, Jorge Zamir Erazo Primeiro Orientador: Yuyama, Kaoru Abstract: The specie Dragon Blood (Croton lechleri Mull.Arg) is a native Euphorbiaceae of the Amazon to have awakened great interest in the world by its medicinal properties in which the sap contains the Alkaloid “Taspina” for treating gastric diseases, scar tissues and in many countries has become a dietary supplement. The vegetative propagation of the species is given normally by the seeds, but this process is still unknown by the own physiology of the same plant. However, it is a solution for the production of seedlings; the specie adds a lot of finite to the shallow and unoccupied areas and the environment with great quantity of organic matter. Following the context the objective of this work was to evaluate different compositions of organic matter from the materials; soil, sawdust and manure favorable in initial seedlings growth via the seeds in the state of Roraima. The experiment as conducted in the fruit industry of the Embrapa Roraima in partnership with the Federal University of Roraima. It adapted an experimental positioning design was adapted in randomized blocks with 12 treatments and 4 replicates of 10 seedlings. During the 140 days total height of the plant, diameter of the shoot, number of leaves, total dry mass, root dry mass, dry mass of aerial part, chlorophyll theories a and b Falker® and the Dickson quality index for seedlings were evaluated. On average the best results were obtained in the soil composition and hen droppings mashed up in 200ml/bag, with height 48.30 (cm-1), diameter 12.08 (mm),15 leaves, dry mass aerial part 19.39 (g-1), root dry mass 15,02 (g-1), total dry mass 34.41(g-1) chlorophyll concentration of Falker® (Chl a) with 31.31 and (Chl b) with 8.28. For treatments with a high content of sawdust presented the least figures in vegetative growth of species’ seedlings. The seedlings of blood species of the dragon present better vegetative growth in substrates with high chicken stool as organic material fountain, these being the best indices of Dickson quality. Editor: Universidade Federal de Roraima Tipo: Dissertação

2017-01-01T00:00:00Z Silva, Edgley Soares da http://repositorio.ufrr.br:8080/jspui/handle/prefix/834 2023-06-20T18:15:10Z 2016-01-01T00:00:00Z

Título: Desempenho de cultivares de melancia nas condições do cerrado de Roraima Autor(es): Silva, Edgley Soares da Primeiro Orientador: Medeiros, Roberto Dantas de Abstract: Watermelon is a crop widespread in all regions of Brazil. In Roraima, its cultivation comes as an alternative exploration of State cerrado areas with a view to the favorable soil and weather conditions, which allow the cultivation during much of the year. In this context, this study aimed to evaluate the agronomic performance of twelve watermelon cultivars produced at conditions of Roraima cerrado. The experiment was conducted in the experimental field of Água Boa Embrapa Roraima, city of Boa Vista city from december 2014 to february 2015. The experimental design was a randomized block with four replications and six plants per plot. The treatments consisted of cultivars: Combat, Conquista, Verena, Congo, Magnum, Electra, Santa Amélia, Explore, Emperor, Crimson Select Plus, Charleston Gray Super and Omaru Yamato. Evaluated the productive characteristics, seed characteristics and fruit quality characteristics. The data were submitted to normality test. When normal, applied to analysis of variance. The average of the cultivars were compared by Scott-Knott test at 5% probability. It was the largest number of fruits on the cultivars Crimson Select Plus, Santa Amélia and Emperor, to 6,425.0, 6,350.0 and 5,875.0 fruit ha-1, respectively. The highest yield was obtained by the cultivar Crimson Select Plus, with 67,848.25 kg ha-1. The average fruit weight ranged from 12.33 ('Magnum’) to 8.26 kg ('Omaru Yamato'). The largest number of seeds was detected in cultivars Santa Amelia and Explore with 1,129.75 and 1,010.75 seeds fruit-1, respectively, while the higher seed weight was observed in 'Charleston Gray Super' with 82.30 g fruit-1. As for the quality of the fruit, the pulp firmness ranged from 14.52 (Magnum) to 10.66 N (Omaru Yamato), as to the thickness of the shell to grow Congo had a higher average (2.62 cm). It was not verified difference in soluble solids content between cultivars, however, the values ​​were relatively high and fit into the standard demanded by the market (>10°Brix). It was concluded that the cultivar Crimson Select Plus has a higher yield of fruits at conditions of Roraima cerrado. The seed characteristics vary depending on the cultivars, with higher amounts in 'Santa Amélia' and 'Explore' and most massive in 'Charleston Gray Super'. The Magnum cultivars, Explore, Charleston Gray Super, Santa Amélia, Crimson Select Plus and Verena have fruits with greater firmness, while cultivating Congo has greater skin thickness. There is no difference in soluble solids content between cultivars. The watermelon Crimson Select Plus cultivars, Santa Amelia and Explore have high potential for cultivation in soil and climatic conditions of the Savanna of Roraima. Editor: Universidade Federal de Roraima Tipo: Dissertação

2016-01-01T00:00:00Z Ribeiro, Carla Maria Cavalcanti http://repositorio.ufrr.br:8080/jspui/handle/prefix/654 2023-07-24T13:19:30Z 2016-01-01T00:00:00Z

Título: Implicações da competição por íons ferro e nitrogênio no controle da mancha-bacteriana do maracujazeiro Autor(es): Ribeiro, Carla Maria Cavalcanti Primeiro Orientador: Vieira, Bernardo de Almeida Halfeld Abstract: The passionfruit bacterial blight is one of the major diseases of culture, bringing a significant impact to production. It is postulated that Xanthomonas axonopodis pv. passifiorae (Xap), the causative agent of the disease, requires a minimum density of viable cells in the phylloplane to be able to cause infection. Therefore, it is assumed that previously selected antagonists , who demonstrated ability to control the disease and to compete for iron ions and organic nitrogen sources, reduce the population of Xap by preemptive exclusion. This is the hypothesis to be tested in this work. On this research was defined: the concentration of colony forming units capable of inducing the development of bacterial spot, the effect of competition for iron ions and nitrogen source in the resident population of Xap in phyloplan, the role of competition for iron ions and N source in reduction of the resident population Xap phyloplan, as well as the severity of bacterial spot. With the results obtained, it can be determined that Fe ions were able to interfere with the population density of Xap in phyloplan and severity of the disease, along with sources N.de how the availability of iron ions or organic nitrogen interferes the population density of Xap in phyloplan passion fruit and severity of the disease. Even in situations where it was observed to decrease the bacterial load of Xap due to restricted access to the Fe ion and the source of N, a reduction of disease severity. This information can brings the possibility of developing new disease control methods, either by the use of selected antagonists or the use of molecules that performs the same restrictions on these elements. Editor: Universidade Federal de Roraima Tipo: Dissertação

2016-01-01T00:00:00Z Nascimento, Cássia Rejane do http://repositorio.ufrr.br:8080/jspui/handle/prefix/635 2023-07-25T18:22:27Z 2014-01-01T00:00:00Z

Título: Biometria e conservação de sementes e influência do fósforo no crescimento inicial de mudas de Camu-camu (Myrciaria dubia (Kunth) McVaugh) Autor(es): Nascimento, Cássia Rejane do Primeiro Orientador: Chagas, Edvan Alves Abstract: The Camu-camu is a species that has aroused the interest of the industry due to their nutraceutical characteristics, especially the high content of vitamin C. Although several studies, there are still gaps in our knowledge about the mechanisms involved in the physiological processes of the seed, especially those associated with storage, germination and early seedling development. In this context, the objective was to study the conservation and germination of camu-camu and the influence of phosphorus on the growth of seedlings. For this, there were three studies to: 1) determine the biometric, physical characteristics and the vigor seed of camu-camu; 2) assess the conservation and germination of camu-camu, as well as to characterize the water absorption of seeds and classified by size; 3) evaluate the initial growth of camu-camu subjected to different doses of phosphorus in different times of applications. The average results for width, thickness, length, individual mass, volume, weight of thousand seeds and number of seeds per pound were respectively: 12.04 x 15.54 x 5.54 mm, 0.79 g, 1035.77 mm3 , 734.27 g and 1362 for small seeds; 12.90 x 17.42 x 6.11 mm, 1.11 g, 1371.98 mm3, 943.67 g and 1061 for medium seeds; 14.42 x 19.14 x 6.74 mm, 1.45 g, 1859.47 mm3, 1213.70 g and 825 for large seeds. The seed size has direct correlation with the force, because the large seeds have greater vigor. Camu-camu seeds stored in cold storage at 15°C inside a plastic packaging have greater force, depending on the electrical conductivity and the speed of emergency. Camu-camu seeds immersed in water, inside the package in both environments camu-camu keep force, with emergency above 80% for 300 days of storage. Camu-camu seedlings not respond to different phosphorus doses up to 120 days form. After120 days, the fertilization needed for better initial growth corresponding to the range 130.00 to 187.00 mg P dm-3 of soil up to 180 days. Editor: Universidade Federal de Roraima Tipo: Dissertação

2014-01-01T00:00:00Z