https://repositorio.ufra.edu.br/jspui/handle/123456789/816 Amazonian Journal of Agricultural and Environmental Sciences - Campus Belém Tue, 14 Apr 2026 00:14:20 GMT 2026-04-14T00:14:20Z https://repositorio.ufra.edu.br/jspui/handle/123456789/1666 Título: Características socioeconômicas e ambientais dos sistemas de produção da pecuária do Estado do Pará. Autor(es): MATTOS, Carlos André Corrêa de; SANTANA, Antônio Cordeiro de; PINTO, Wilza da Silveira; CARDOSO, Alexandre Jorge Gaia; COSTA, Nilson Luiz Abstract: Cattle ranching in the Amazon is regarded as a system of unsustainable production. However, new technologies are being implemented to reduce impacts on the environment. The aim of this study was to use data from the Agricultural Census the IBGE Agricultural Census of 2006 to identify characteristics of technological modernization of the livestock production systems in the Brazilian State of Pará. The methodology used for data processing was Exploratory Factor Analysis (EFA) and Cluster Analysis (CA). The sample included the 22 microregions of Pará and 12 variables relating to livestock management practices were selected from the Agricultural Census of 2006. The factor analysis extracted three factors with the power to explain 86.05% of data variance. Three groups spatially located in Pará were identified and their characteristics are similar to those established by the results of EFA. Finally, it is concluded that intensive farming is carried out mostly in Pará and has ability to explain the livestock systems of Pará. Wed, 17 Feb 2010 00:00:00 GMT https://repositorio.ufra.edu.br/jspui/handle/123456789/1666 2010-02-17T00:00:00Z https://repositorio.ufra.edu.br/jspui/handle/123456789/1641 Título: Ingresso e mortalidade de árvores após a colheita de madeira em área de terra firme na Floresta Nacional do Tapajós (PA). Autor(es): COSTA, Dulce Helena Martins; SILVA, José Natalino Macedo; CARVALHO, João Olegário Pereira de Abstract: Ingrowth and mortality of trees were analyzed from 1981 to 1997 in a logged area of the Tapajos National Forest in the Brazilian Amazonia. Ingrowth was the number of trees that reached 5cm dbh in two subsequent measurements. Mortality was the number of dead trees > 5 em dbh between two subsequent measurements. Ingrowth increased immediately after logging but the gradual canopy closure increased mortality rate, mainly in light-demanding species. ln the last ten years the forest showed a trend to balance ingrowth and mortality. Ingrowth of commercial species was higher than mortality in the last ten years of the study period. Tue, 01 Jan 2002 00:00:00 GMT https://repositorio.ufra.edu.br/jspui/handle/123456789/1641 2002-01-01T00:00:00Z https://repositorio.ufra.edu.br/jspui/handle/123456789/1640 Título: Mobilização de reservas na emergência e desenvolvimento de plântulas de cupuaçuzeiro (Theobroma grandiflorum (Willd. ex.Spreng.) Schum.). 2- Proteínas e aminoácidos. Autor(es): FIGUEIRÊDO, Francisco José Câmara; CARVALHO, Cláudio José Reis de; ROCHA NETO, Olinto Gomes da Abstract: The objective of this study was to determine the reserves of soluble proteins and free amino acids in seeds, cotyledons, roosts, epicotyls and leaves of “cupuaçu” (Theobroma grandiflorum (Willd. ex. Spreng.) Schum.) seedlings. The samplings of seeds were made immediately after the pulping; before and after exposure of the seeds to 16 + 2ºC and 65 + 2 % RH for 48, 72, 240 and 480 hours and to 21 + 2 ºC and 45 + 2 % RH, for 48 and 72 hours. Sampling of structural parts of the seedlings was made 30, 45 and 90 days after sowing. It was concluded that: a) the dehydration of “cupuaçu” seeds cause reductions in the average of soluble proteins and increases of free amino acids; b) the soluble proteins, with 23,6 % of the total dry weight, are the largest sources of reserves in the “cupuaçu” seeds, while the free amino acids represented only 1 % of the dry matter of plant; c) the cotyledons are the main sites of soluble proteins and free amino acids reserves 30 and 90 days after sowing. Tue, 01 Jan 2002 00:00:00 GMT https://repositorio.ufra.edu.br/jspui/handle/123456789/1640 2002-01-01T00:00:00Z https://repositorio.ufra.edu.br/jspui/handle/123456789/1639 Título: Porta-enxertos e enxertia de castanheira-do-brasil pelo método da borbulhia em placa. Autor(es): ALMEIDA, Igor Ivison; SANTOS, Reila Ferreira dos; MAYER, Marcos Miguel; SILVA, Jordânia Zerrar da; ALCOFORADO, Ayulle Thalia W.; PEDROZO, Cássia Ângela Abstract: A large part of Brazil nut production comes from extraction in native areas. Thus, thesuccessful exploitationincultivationsystems is highly dependent onvegetative propagationtechniques, to maintain the genetic traits and shorten the juvenile period of selected genotypes. Thisstudy aimed to determine the optimal age of Brazil nut rootstocks to performgrafting by patchbudding method, as well as to verify the percentage of graft survival and the initial growth ofdifferent clones in Roraima. For this purpose, two experiments were installed in a randomized blockdesign, with four replications. The treatments were arranged in a split-time scheme in time, such asthe genotypes considered the plots and the evaluation times the subplots. It were evaluated rootstockgrowth traits, percentage of alive grafts and sprouts growth traits. The rootstocks reached therecommended size for grafting between 26 and 34 months after planting, indicating slower growthwhen compared to other locations. At 1 20 days after grafting, it were obtained percentages of graftsurvival ranging from25%to 1 00%, depending on the graft genotype. The overall averagepercentage of survival was over 70%. The initial growth (height, diameter and number of lateralshoots) of shoots observed for some genotypes is indicative of their adaptation to the cultivationconditions considered. As the Brazil nut tree is a perennial species, both the growth in older ages, aswell as the future productivity and longevity ofthe plants must be monitored. Tue, 08 Dec 2020 00:00:00 GMT https://repositorio.ufra.edu.br/jspui/handle/123456789/1639 2020-12-08T00:00:00Z