Navegando por Assunto "Agroecossistema"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Balanço de água em área de cultivo de soja no Leste da Amazônia
(Universidade Federal do Pará, 2007) BISPO, Carlos José Capela; RIBEIRO, Aristides; http://lattes.cnpq.br/8652338930029697; ROCHA, Edson José Paulino da; http://lattes.cnpq.br/2313369423727020
The expansion of the agricultural frontier, driven mainly by soy cultivation (Glycine max (L) Merrill), covers a large regional extent and is highly important to understanding the changing face of Amazonia. A field observation experiment was established to study water balance components of the soy agriculture ecosystem and analyze the impact of the water balance associated with forest conversion. The experiment also evaluated the crop’s need for water according to its development phase. For the water balance study, the BRS Candeia cultivar was used along with its respective phenological phases. The experiment measured soil water storage, precipitation, plant cover water interception, superficial drainage of soil water, evapotranspiration (Etc), and water content retained by the soy plant. Water infiltration in the soil was also measured. Interception and superficial drainage were 45,9% and 1% of the precipitation, respectively. The greatest evapotranspiration occurred during the flowering phase (R1-R2) with a gradual decline in values until crop harvest and a cycle average of 3,80mm.day-1, which was very similar to that found in forest. The period between the vegetative phase (V) and fruiting (R3-R4) was when the plant presents the greatest percentage of water, declining gradually during the grain-forming phase (R5). Overall, no water deficiency occured in the mean soil water balance. Precipitation was greater than the amount necessary to compensate for evapotranspiration and supply adequate water storage, creating a surplus of water in the soil.
Acesso aberto (Open Access)
Contribuição de quintais agroflorestais para a segurança alimentar de agricultores familiares no Baixo Irituia, Nordeste Paraense
(Universidade Federal do Pará, 2011-08-31) MIRANDA, Silviane Batista; KATO, Osvaldo Ryohei; http://lattes.cnpq.br/4241891652832872; https://orcid.org/0000-0002-2422-9227
The yards are agroecosystems agroforestry located near residences, composed of a variety of plant species (food, medicinal, ornamental and timber) and small animals, providing products that contribute to a diverse and healthy diet. The purpose of the study was to evaluate the contribution of agroforestry gardens for food security in small family farmers in the Lower Irituia, Northeast Pará. It starts with the hypothesis that families with agroforestry gardens have access to a greater quantity and quality of perishable food and a lower consumption of processed products compared to those who do not have backyards agroforestry. The study was conducted in the communities of Ajara, Araraquara, and Santa Terezinha Puraquequara family farmers in 30 of which agroforestry gardens have 18 and 12 do not. Through the techniques of structured interviews and semi-structured, guided tours, direct observation and recall 24 hours were carried out a survey of the species (plant and animal) 18 yards in agroforestry and verification of the food consumed by 30 households interviewed, both those produced in the backyards agroforestry or not, and those of industrial origin. We studied 18 yards agroforestry rose 125 species of plants and five animal species. Of the 130 plant and animal species, 70 are food plants (of which 44 are fruit, 21 vegetable crops and 5 white tillage (such as cassava, rice and corn), 31 are medicinal, are 17 timber, 7 and 5 are ornamental food and animals. Of the 70 food species, 94% being consumed by the families interviewed, especially the fruit (59%), followed by vegetable crops (30% of total) and the white farming (11% of total). The species fruit is consumed in the form of juice (especially after meals) or fresh (for the occasional picnic). Banana, cashew, guava, cupuaçu, pineapple, lemon and orange are the most consumed fruit in the gardens as cashew and banana agroforestry agroforestry gardens without spaces. The species most commonly found and consumed in both the chicken yard, which is designed for self- consumption and sale. agroforestry gardens Farmers have access to a better nutritional status by consuming greater quantities and variety of food from the gardens, especially fruits, rich in vitamins and minerals. With respect to the consumption of foods were collected from farmers in agroforestry gardens without spaces while among the 17 items with 15 items agroforestry gardens, and food most consumed by two groups: rice, coffee, oil and sugar. industrialized products such as bologna, artificial juice and chicken farm were consumed in higher percentages by farmers in agroforestry gardens without spaces. By applying the Student test showed a difference statistically significant in the mean amount of food consumed (in backyards and industrial) by two groups of farmers in the two periods of the year (rainy and dry), confirming the hypothesis of the research. Backyards agroforestry is therefore important to introduce changes in diet, they contribute in the diversification and complementary feeding.
Acesso aberto (Open Access)
Mitigação de impactos ambientais em assentamentos rurais: o papel da Universidade na construção do conhecimento agroecológico
(Revistas Brasileiras Publicações de Periódicos e Editora Ltda., 2022-05) COSTA, Karolinny Carneiro Guerra; MANESCHY, Rosana Quaresma; QUEIROZ, Jaqueline Fontel de; MELLO, Andréa Hentz de
The objective was to systematize the agroecological practices designed and tested to mitigate environmental impacts in Southeast Pará, as well as the contribution of the Federal University of Pará in the construction of agroecological knowledge in the region. The research had a qualitative approach, based on the analysis of bibliographic and documentary material. It was found the existence of teaching, research and development activities using a participatory approach and/or action research methodology in rural settlements. Projects carried out in partnership with family farmers have designed local technical references, enabling the mitigation of environmental impacts and supporting the development of public policies suited to the reality of production systems in this social category.