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Nascimento R.S.M.,Federal University of Vicosa | Cardoso J.A.,IFTO | Cocozza F.D.M.,UNEB
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

The 'mangaba' is widely used by agribusiness, as compared to other native fruits of Northeast, especially in the Cerrado biome for food utilization. This study aimed to evaluate the physical and physicochemical characterization of 'mangabeira' fruits in the western region of Bahia. Tree hundred fruits were sampled from ten matrices, which were collected in an area of the municipalities of Angical, Barreiras and St Desiderio and conducted to the Seed Laboratory of UNEB. For the physical assessments, longitudinal and transversal diameters of the fruit, fruit weight, total seed weight per fruit, weight of the pulp and peel, and yield of pulp and peel were considered. As for the physicochemical evaluations, the fruit pulp was subjected to the determinations of pH, soluble solids content, titratable acidity and ratio. For the variables, longitudinal and transversal diameters, the weight of pulp and peel, seed weight, fruit weight and yield of pulp and peel, the means were, respectively, 32.34 and 31.87 mm, 14.77, 2.40 and 17.17 g and 85.93%. With regard to pH, SS, AT and ratio (SS/AT), the means were 3.93, 17.04° Brix, 0.98 and 18.62. The results indicated that there are statistically significant differences between all variables evaluated. Source


de Freitas I.C.,IFTO | dos Santos F.C.V.,Federal University of Goais | Custodio Filho R.O.,Federal University of Goais | da A Silva N.R.,IFTO | Correchel V.,Federal University of Goais
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

The replacement of native forests for agrosystems causes changes in soil structure. The degree of these changes depends on the intensity of use and soil management, climatic conditions and soil physical and chemical properties. The aim of this study was to evaluate the soil bulk density (Bd), soil resistance to penetration and organic matter content of an Ortic Quartzarenic Neosol under four land use systems: native forest, agroforestry, pasture and other area recently converted to agricultural use. In each systemseven soil profiles were selected and samples were collected in July 2010 and January 2011. The soil resistance to penetration was determined in 0-40 cm depth using an impact penetrometer, Planasucar Stolf IAA model. The water content in the soil layers was determined in 0-20 and 20-40 cm depth. The organic matter and soil bulk density were deternied in layers 0-5, 5-10, 10-20 and 20-40 cm. Among the evaluated systems, the lowest values of soil bulk density and soil resistance to penetration were found inagroforestry and the highest values were obtained in the pasture. In the area recently converted to agricultural use the results obtained were similar to those obtained under native forest. Source


Da Silva Neto S.P.,Federal University of Tocantins | Dos Santos A.C.,Ciencia Animal Tropical | De Lima Leite R.L.,IFTO | Da Silva J.E.C.,Ciencia Animal Tropical | And 3 more authors.
Semina:Ciencias Agrarias | Year: 2015

This study aimed to quantify, describe, and identify plant litter production and nutrient accumulation zones in different forest-pasture integration (FPI) systems and forest strata of the Cerrado-Amazon transition on typical orthic Quartzarenic Neosol using spatial analysis, principal component analysis, and non-hierarchical fuzzy k-mean clustering logic techniques. The evaluations were performed at two FPI systems comprising a combination of Brachiaria brizantha cv. Marandu and thinned native vegetation with 50 and 75% (FPI-I and FPI-II, respectively) shade in an original thinned forest (NFI) and in an original intact forest (NF-II) with 80 and 95% shade, respectively. An area of 4,000 m2 (40 x 100 m) that contained 32 sampling points arranged in a 4 x 25 m grid was demarcated for each treatment. Plant litter was collected using 32 collectors installed at equidistant points. Twelve nylon bags were placed on the soil surface at each point to evaluate the plant litter decomposition, totaling 384 bags per treatment. It was possible to quantify, describe, and define plant litter production and nutrient accumulation zones in different FPI systems and forest strata of the Cerrado-Amazon transition on orthic Quartzarenic Neosol using geostatistical analysis, principal components, and non-hierarchical fuzzy k-mean clustering logic procedures. Source


Freitas I.C.,IFTO | Santos F.C.V.,Federal University of Goais | Custodio Filho R.O.,Federal University of Goais | Correchel V.,UFG | Silva R.B.,IFTO
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2013

The absence of environmental constraints to organic production is the main characteristic of the Amazon, which does not translate into high yields of crops for several successive years when the forest is replaced by agroecosystems. The objective of this study was to evaluate the effect of soil management on the chemical and physical properties of soil by family agriculture, conducted in primitive way. The evaluated forms of use were: agroforestry system, pasture, slash-and-burn agriculture and preserved forest (used as reference), all under Entisol Quartzipsamment. Soil monoliths were collected at 0-5, 5-10, 10-20 and 20-40 cm during two consecutive years (2010/2011 and 2011/2012) in July and January, collecting seven replicates per system. The evaluated soil attributes were: flocculation, aggregates larger than 2 mm, organic matter, acidity, exchangeable cations, phosphorus, base saturation, aluminum and cation exchange capacity. The results indicate that 22 years after the conversion of forest into agricultural ecosystems it is still possible to see the best indicators in managed systems. Source

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