Instituto Nacional Of Colonizacao E Reforma Agraria

Teresina, Brazil

Instituto Nacional Of Colonizacao E Reforma Agraria

Teresina, Brazil
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de Andrade E.M.,Federal University of Ceará | Lopes F.B.,Federal University of Ceará | Palacio H.A.Q.,Instituto Federal Of Educacao Ciencias E Tecnologia Do Ceara Ifce | do Nascimento Aquino N.,Instituto Nacional Of Colonizacao E Reforma Agraria | Alexandre D.M.B.,Companhia de Gestao dos Recursos Hidricos COGERH
Revista Ciencia Agronomica | Year: 2010

The aim of this work was to identify and to investigate the determining factors of water table quality in the Irrigated Perimeter of Baixo Acaraú, Ceará, Brazil, using factor analysis/principal component analysis (FA/PCA). It was sampled nine shallow wells spread out on two different types of land: uncultivated area (A1) and irrigated area (A2). Groundwater was sampled monthly from Dec/2003 to Nov/2005, Nov/2006, Mar and April/2007. We measured the following parameters: pH, electrical conductivity (EC), and concentrations of Na+, Ca2+, Mg2+, K+, Cl-, PO4-, NH4-, NO3-, SO4-2, HCO3- and CO3-2. The PCA resulted in a model composed of three components that explained 93.06% and 83.72% of the total variance of the data set from A1 and A2, respectively. It was found that the determining factors of water quality were the mineralization processes and anthropogenic activities in both areas. The anthropogenic activities in the irrigated area were related to nitrogenous fertilizers, while those in the uncultivated area were associated with the presence of septic tanks (from the lack of sewage treatment).


De Souza M.S.,Instituto Nacional Of Colonizacao E Reforma Agraria | De Medeiros J.F.,Federal Rural University of the Semiarid Region | Da Silva M.V.T.,UFERSA | Dos Prazeres Da Silva O.M.,UFERSA | Chaves S.W.P.,UFERSA
Semina:Ciencias Agrarias | Year: 2014

The objective of this work was to evaluate the effect of N and P2O5rates through irrigation water on the uptake of macro and micronutrients by watermelon crop. The study was conducted at the farm Santa Luzia, in Baraúna, in the State of Rio Grande do Norte, Brazil (5° 05' 57"S e 37° 33' 16"W). The experimental design was completely randomized blocks with strip cropping (4 x 4) x 2, resulting and thirty two treatments with three replicates. The treatments consisted in the application of four N rates (0; 48; 121; 218 kg ha-1) combined with four rates of P2O5(0; 88; 220; 397 kg ha-1) with two cultivars of watermelon. No deficiency of N, P, K, Ca, Mg, Fe and Mn in the watermelon leaves was found in any treatment, excepting Cu and Zn. The N and P2O5 rates, as well as the interaction, provide significant effect on contents of macronutrients in the watermelon leaves. Macronutrients most absorbed by the leaves of watermelon were N>Ca>K>Mg>P.


Santos R.P.,Instituto Nacional Of Colonizacao E Reforma Agraria | de Cristo-Araujo M.,National Institute of Amazonian Research | Picanco-Rodrigues D.,Federal University of Amazonas | Filho S.A.,Federal University of Amazonas | Clement C.R.,National Institute of Amazonian Research
Revista Brasileira de Fruticultura | Year: 2011

The hybrid populations of peach palm (Bactris gasipaes Kunth) have accumulated genetic variability from adjacent landraces, which is expected to increase their variability. To test this hypothesis, 176 plants maintained in the peach palm Germplasm Bank at INPA, including four hybrid populations [Belém (n=26); Manaus (n=38); Iquitos, Peru (n=41); Yurimáguas, Peru (n=41)], two wild populations (B. gasipaes variety chichagui) types 1 (n=21) and 3 (n=7), and two samples of a related species, B. riparia, were genotyped with RAPD markers and compared to adjacent landraces reported in other studies. Eight RAPD primers generated 88 polymorphic and 11 monomorphic markers. The replicability test presented a Dice similarity of 0.67, considered acceptable. The average heterozygosity of the hybrid populations was 0.34 and the polymorphism was 87.9%, greater than in the wild populations (0.31; 74.7%). The dendrogram of Dice similarities did not present groups that clearly correspond to the hybrid populations. The gene flow between Iquitos and Yurimáguas (Nm=12.75), and between Iquitos and Manaus (Nm=9.47) was high, while between Belém and Manaus it was lower than expected (Nm=7.72), probably due to the influence of the Solimões landrace near Manaus. The high value of heterozygosity in Manaus seems to be the result of the union of two dispersals after domestication: the western Amazonian dispersal, with Iquitos and Yurimáguas, and the eastern Amazonian, with Belém, joining in Manaus. However, these hybrid populations did not present an accumulation of genetic variability expressive enough to differentiate them from the landraces.


De Souza M.S.,Instituto Nacional Of Colonizacao E Reforma Agraria | De Medeiros J.F.,Federal Rural University of the Semiarid Region | Da Silva M.V.T.,Graduacao em Agronomia | Dos Prazeres Da Silva O.M.,Curso de Mestrado em Fitotecnia | Chaves S.W.P.,UFERSA
Semina:Ciencias Agrarias | Year: 2014

The objective of this work was to evaluate the effect of N and P2O5 rates through irrigation water on the uptake of macro and micronutrients by watermelon crop. The study was conducted at the farm Santa Luzia, in Baraúna, in the State of Rio Grande do Norte, Brazil (5° 05′ 57″S e 37° 33′ 16″W). The experimental design was completely randomized blocks with strip cropping (4 × 4) × 2, resulting and thirty two treatments with three replicates. The treatments consisted in the application of four N rates (0; 48; 121; 218 kg ha-1) combined with four rates of P2O5 (0; 88; 220; 397 kg ha-1) with two cultivars of watermelon. No deficiency of N, P, K, Ca, Mg, Fe and Mn in the watermelon leaves was found in any treatment, excepting Cu and Zn. The N and P2O5 rates, as well as the interaction, provide significant effect on contents of macronutrients in the watermelon leaves. Macronutrients most absorbed by the leaves of watermelon were N>Ca>K>Mg>P.


dos Santos D.S.,Instituto Nacional Of Colonizacao E Reforma Agraria | Sparovek G.,University of Sao Paulo
Revista Brasileira de Ciencia do Solo | Year: 2011

Riparian forests are generally associated to sediment retention and consequently to the mitigation of off-site erosion, but few studies have investigated this effect. The purpose of this study was to analyze the efficiency of riparian forests on the retention of sediment from crop lands using the 137Cs technique. Sampling in an area located in Central Brazil, under intensive cotton farming in a conventional system, was performed in July 2005, using cross-sectional analyses. The 137Cs technique proved adequate for estimating the soil gains and losses in this kind of study; sediment deposition in the forest-covered riparian area was detected, evidencing the effectiveness of this formation in retaining sediments from crop land.


Melo L.C.A.,Instituto Agronomico Of Campinas | Avanzi Jr. C.,Embrapa Pesca e Aquicultura | Carvalho R.,Du Pont do BRA S A | de Souza F.S.,Federal University of Espirito Santo | And 3 more authors.
Pesquisa Agropecuaria Tropical | Year: 2011

Liming is essential for obtaining high yield levels in tropical acid soils. The objective of this study was to evaluate maize nutrition and dry matter yield in soil under liming estimated by three calculation methods and sulfur fertilization. The experiment was carried out under greenhouse conditions, in PVC cylinders, by using one plant per cylinder. Filler dolomite lime was added to an Oxisol collected from native forest, at the 4.2 Mg ha-1, 6.7 Mg ha-1, and 8.0 Mg ha-1 doses, respectively calculated by the exchangeable aluminum, magnesium, and calcium method; base saturation method; and SMP buffer method, combined with three sulfur doses (10 mg dm-3, 30 mg dm-3, and 60 mg dm-3). Control treatments without lime or sulfur were also included. Maize plants were harvested at 45 days after sowing and divided into shoots and roots. The most efficient lime recommendation method for maize was the base saturation method. The application of sulfur doses did not affect the maize development up to the evaluated stage.


Soares P.,University of Alicante | Martinelli S.S.,Federal University of Santa Catarina | Melgarejo L.,Instituto Nacional Of Colonizacao E Reforma Agraria | Davo-Blanes M.C.,University of Alicante | Cavalli S.B.,Federal University of Santa Catarina
Ciencia e Saude Coletiva | Year: 2015

The objective of this study was to assess compliance with school food programme recommendations for the procurement of family farm produce. This study consists of an exploratory descriptive study utilising a qualitative approach based on semistructured interviews with key informants in a municipality in the State of Santa Catarina in Brazil. Study participants were managers and staff of the school food programme and department of agriculture, and representatives of a farmers’ organisation. The produce delivery and demand fulfilment stages of the procurement process were carried out in accordance with the recommendations. However, nonconformities occurred in the elaboration of the public call for proposals, elaboration of the sales proposal, and fulfilment of produce quality standards. It was observed that having a diverse range of suppliers and the exchange of produce by the cooperative with neighbouring municipalities helped to maintain a regular supply of produce. The elaboration of menus contributed to planning agricultural production. However, agricultural production was not mapped before elaborating the menus in this case study and an agricultural reform settlement was left out of the programme. A number of weaknesses in the programme were identified which need to be overcome in order to promote local family farming and improve the quality of school food in the municipality. © 2015, Associacao Brasileira de Pos - Graduacao em Saude Coletiva. All rights reserved.


PubMed | University of Alicante, Instituto Nacional Of Colonizacao E Reforma Agraria and Federal University of Santa Catarina
Type: Journal Article | Journal: Ciencia & saude coletiva | Year: 2015

The objective of this study was to assess compliance with school food programme recommendations for the procurement of family farm produce. This study consists of an exploratory descriptive study utilising a qualitative approach based on semistructured interviews with key informants in a municipality in the State of Santa Catarina in Brazil. Study participants were managers and staff of the school food programme and department of agriculture, and representatives of a farmers organisation. The produce delivery and demand fulfilment stages of the procurement process were carried out in accordance with the recommendations. However, nonconformities occurred in the elaboration of the public call for proposals, elaboration of the sales proposal, and fulfilment of produce quality standards. It was observed that having a diverse range of suppliers and the exchange of produce by the cooperative with neighbouring municipalities helped to maintain a regular supply of produce. The elaboration of menus contributed to planning agricultural production. However, agricultural production was not mapped before elaborating the menus in this case study and an agricultural reform settlement was left out of the programme. A number of weaknesses in the programme were identified which need to be overcome in order to promote local family farming and improve the quality of school food in the municipality.


Fontana A.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária | da Silva C.F.,Federal Rural University of Rio de Janeiro | Pereira M.G.,Federal Rural University of Rio de Janeiro | Loss A.,Federal Rural University of Rio de Janeiro | And 2 more authors.
Acta Scientiarum - Agronomy | Year: 2011

Assessment of organic matter compartments in an Atlantic Forest area. This study has as objective to evaluate the soil organic matter (SOM) compartments in areas with different vegetables coverings in the around of Serra do Mar State Park, Ubatuba, São Paulo State. Were selected areas of cassava (monoculture), banana (agroforest system), scrub and secondary forest (Atlantic Forest) and samples of soil were taken at 0-5 and 5-10 cm depths in July 2003 (winter) and March 2004 (summer). Were quantified the total organic carbon (TOC), the humic substances with tenors of organic carbon in the fulvic acid fraction (C-FAF); humic acid fraction (C-HAF) and humin (C-HUM) and the C-FAH/C-FAF ratio and the light organic matter (LOM). The tenors of COT varied between 26.3 - 35.7 g kg-1 and 20.2 - 33.1 g kg-1, 0-5 and 5-10 cm depth, respectively. The tenors of COT were similar between the forest and banana areas. The tenors of MOL were similar between the banana and scrub areas. For the humic substances, the C-HUM predominated and presented small variation between coverings, followed by C-FAF, which was lesser in the banana and cassava areas and C-HAF with small tenors in the cassava area.


Milare G.,Federal University of Mato Grosso do Sul | Milare G.,Instituto Nacional Of Colonizacao E Reforma Agraria | da Silva N.M.,Federal University of Mato Grosso | Paranhos Filho A.C.,Federal University of Mato Grosso do Sul
Anuario do Instituto de Geociencias | Year: 2016

This study aims to present an overview of the free software use in geographic information systems (GIS) in Brazil, defining trends and the thematic areas that are most used. For this, through scientometrics, articles published in the Brazilian Symposium on Remote Sensing were analyzed. This event has been chosen because it has been accomplished since 1978, represent the most important congress in Brazil and thus reflects the trends and uses of geotechnologies in the country. There was the analytical work between 1978 and 2013, totaling 6.778 items. Of these, 2.128 articles have cited the use of free software. There was an increasing trend, from 90’s, averaging 32% of published articles using free software over the past 25 years. Environmental analysis was the most constant theme in the manuscripts published which used free software in GIS, with 519 articles. © 2016 Universidade Federal do Rio de Janeiro. All rights reserved.

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